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If we ever see a touch report with contact count data we initialize
several variables used to read the contact count in the pre-report
phase. These variables are never reset if we process a report which
doesn't contain a contact count, however. This can cause the pre-
report function to trigger a read of arbitrary memory (e.g. NULL
if we're lucky) and potentially crash the driver.
This commit restores resetting of the variables back to default
"none" values that were used prior to the commit mentioned
below.
Link: https://github.com/linuxwacom/input-wacom/issues/276
Fixes: 003f50ab673c (HID: wacom: Update last_slot_field during pre_report phase)
CC: stable@vger.kernel.org
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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AES hardware may internally re-classify a contact that it thought was
intentional as a palm. Intentional contacts are reported as "down" with
the confidence bit set. When this re-classification occurs, however, the
state transitions to "up" with the confidence bit cleared. This kind of
transition appears to be legal according to Microsoft docs, but we do
not handle it correctly. Because the confidence bit is clear, we don't
call `wacom_wac_finger_slot` and update userspace. This causes hung
touches that confuse userspace and interfere with pen arbitration.
This commit adds a special case to ignore the confidence flag if a contact
is reported as removed. This ensures we do not leave a hung touch if one
of these re-classification events occured. Ideally we'd have some way to
also let userspace know that the touch has been re-classified as a palm
and needs to be canceled, but that's not possible right now :)
Link: https://github.com/linuxwacom/input-wacom/issues/288
Fixes: 7fb0413baa7f (HID: wacom: Use "Confidence" flag to prevent reporting invalid contacts)
CC: stable@vger.kernel.org
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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These two values go hand-in-hand and must be valid for the driver to
behave correctly. We are currently lazy about updating the values and
rely on the "expected" code flow to take care of making sure they're
valid at the point they're needed. The "expected" flow changed somewhat
with commit f8b6a74719b5 ("HID: wacom: generic: Support multiple tools
per report"), however. This led to problems with the DTH-2452 due (in
part) to *all* contacts being fully processed -- even those past the
expected contact count. Specifically, the received count gets reset to
0 once all expected fingers are processed, but not the expected count.
The rest of the contacts in the report are then *also* processed since
now the driver thinks we've only processed 0 of N expected contacts.
Later commits such as 7fb0413baa7f (HID: wacom: Use "Confidence" flag to
prevent reporting invalid contacts) worked around the DTH-2452 issue by
skipping the invalid contacts at the end of the report, but this is not
a complete fix. The confidence flag cannot be relied on when a contact
is removed (see the following patch), and dealing with that condition
re-introduces the DTH-2452 issue unless we also address this contact
count laziness. By resetting expected and received counts at the same
time we ensure the driver understands that there are 0 more contacts
expected in the report. Similarly, we also make sure to reset the
received count if for some reason we're out of sync in the pre-report
phase.
Link: https://github.com/linuxwacom/input-wacom/issues/288
Fixes: f8b6a74719b5 ("HID: wacom: generic: Support multiple tools per report")
CC: stable@vger.kernel.org
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The flag uhid->running can be set to false by uhid_device_add_worker()
without holding the uhid->devlock. Mark all reads/writes of the flag
that might race with READ_ONCE()/WRITE_ONCE() for clarity and
correctness.
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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uhid has to run hid_add_device() from workqueue context while allowing
parallel use of the userspace API (which is protected with ->devlock).
But hid_add_device() can fail. Currently, that is handled by immediately
destroying the associated HID device, without using ->devlock - but if
there are concurrent requests from userspace, that's wrong and leads to
NULL dereferences and/or memory corruption (via use-after-free).
Fix it by leaving the HID device as-is in the worker. We can clean it up
later, either in the UHID_DESTROY command handler or in the ->release()
handler.
Cc: stable@vger.kernel.org
Fixes: 67f8ecc550b5 ("HID: uhid: fix timeout when probe races with IO")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Perform some minor cleanups on this driver. Include header files for
struct definitions that are used, drop a forward declaration that isn't
useful, and mark a sysfs attribute static as it isn't used outside this
file.
Cc: Sean O'Brien <seobrien@chromium.org>
Cc: Ting Shen <phoenixshen@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Unfortunately details of USB HID transport bled into HID core and
handling of numbered/unnumbered reports is quite a mess, with
hid_report_len() calculating the length according to USB rules,
and hid_hw_raw_request() adding report ID to the buffer for both
numbered and unnumbered reports.
Untangling it all requres a lot of changes in HID, so for now let's
handle this in the driver.
[jkosina@suse.cz: microoptimize field->report->id to report->id]
Fixes: 14c9c014babe ("HID: add vivaldi HID driver")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Stephen Boyd <swboyd@chromium.org> # CoachZ
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Battery status on Elan tablet driver is reported for the HP ENVY x360
15t-dr100. There is no separate battery for the Elan controller resulting in a
battery level report of 0% or 1% depending on whether a stylus has interacted
with the screen. These low battery level reports causes a variety of bad
behavior in desktop environments. This patch adds the appropriate quirk to
indicate that the batery status is unused for this target.
Cc: stable@vger.kernel.org
Signed-off-by: Karl Kurbjun <kkurbjun@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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- proper batter reporting for hid-magicmouse USB-connected devices (José Expósito)
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- new driver to support for LetSketch device (Hans de Goede)
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- PM wakeup support for i2c-hid driver (Matthias Kaehlcke)
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- locking performance improvement for hidraw code (André Almeida)
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- Apple Magic Keyboard support improvements (José Expósito, Alex Henrie,
Benjamin Berg)
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- support for USI style pens (Tero Kristo, Mika Westerberg)
- quirk for devices that need inverted X/Y axes (Alistair Francis)
- small core code cleanups and deduplication (Benjamin Tissoires)
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If the timer introduced by the commit below is started, then it must be
deleted in the error handling of the probe. Otherwise it would trigger
once the driver is no more.
Fixes: 0b91b4e4dae6 ("HID: magicmouse: Report battery level over USB")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Tested-by: José Expósito <jose.exposito89@gmail.com>
Reported-by: <syzbot+a437546ec71b04dfb5ac@syzkaller.appspotmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This function had kernel-doc that not used a hash to separate
the function name from the one line description.
The warning was found by running scripts/kernel-doc, which is
caused by using 'make W=1'.
drivers/hid/intel-ish-hid/ishtp-fw-loader.c:271: warning: This comment
starts with '/**', but isn't a kernel-doc comment. Refer
Documentation/doc-guide/kernel-doc.rst
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Specify that both TGL and ADL don't support DMA cache snooping.
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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uclogic_params_frame_init_v1_buttonpad
The function performs a check on the hdev input parameters, however, it
is used before the check.
Initialize the udev variable after the sanity check to avoid a
possible NULL pointer dereference.
Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443763 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The function performs a check on its input parameters, however, the
hdev parameter is used before the check.
Initialize the stack variables after checking the input parameters to
avoid a possible NULL pointer dereference.
Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443804 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The function performs a check on the hdev input parameters, however, it
is used before the check.
Initialize the udev variable after the sanity check to avoid a
possible NULL pointer dereference.
Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443827 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The function performs a check on its input parameters, however, the
hdev parameter is used before the check.
Initialize the stack variables after checking the input parameters to
avoid a possible NULL pointer dereference.
Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443831 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Add a new driver for the LetSketch / VSON WP9620N drawing tablet. This
drawing tablet is also sold under other brand names such as Case U,
presumably this driver will work for all of them. But it has only been
tested with a LetSketch WP9620N model.
These tablets also work without a special HID driver, but then only
part of the active area works and both the pad and stylus buttons are
hardwired to special key-combos. E.g. the 2 stylus buttons send right
mouse clicks / resp. "e" key presses.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2005575
BugLink: https://github.com/DIGImend/digimend-kernel-drivers/issues/528
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Use the function key table introduced for the Magic Keyboard 2021
without fingerprint reader in the models with fingerprint reader and/or
numpad.
Tested with the ANSI variant of the keyboard with and without numpad.
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The new 2021 apple models have a different FN key assignment. Add a new
translation table and use that for the 2021 magic keyboard.
Signed-off-by: Benjamin Berg <bberg@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The Apple Magic Trackpad 2021 (3rd generation) has the same product ID
as the 2nd generation. However, when connected through Bluetooth, the
version has changed from 0x107 to 0x110.
The other meaningful change is that the name has dropped the generation
number and now it is just "Apple Inc. Magic Trackpad", like the first
generation model.
Set the device name correctly to ensure the same driver settings are
loaded, whether connected via Bluetooth or USB.
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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If the Apple Magic Trackpad 2 has been connected to a Mac, the name
is automatically personalized showing its owner name. For example:
"José Expósito's Trackpad".
When connected through Bluetooth, the personalized name is reported,
however, when connected through USB the generic name is reported.
Set the device name correctly to ensure the same driver settings are
loaded, whether connected via Bluetooth or USB.
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Tested-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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The return value of devm_kzalloc() needs to be checked.
To avoid hdev->dev->driver_data to be null in case of the failure of
alloc.
Fixes: 14c9c014babe ("HID: add vivaldi HID driver")
Cc: stable@vger.kernel.org
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211215083605.117638-1-jiasheng@iscas.ac.cn
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An overlook from the previous commit: we don't even parse or start the
device, meaning that the device is not presented to user space.
Fixes: 93020953d0fa ("HID: check for valid USB device for many HID drivers")
Cc: stable@vger.kernel.org
Link: https://bugs.archlinux.org/task/73048
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215341
Link: https://lore.kernel.org/r/e4efbf13-bd8d-0370-629b-6c80c0044b15@leemhuis.info/
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Allow the touchscreen-inverted-x/y device tree properties to control the
HID_QUIRK_X_INVERT/HID_QUIRK_Y_INVERT quirks for the hid-input device.
Signed-off-by: Alistair Francis <alistair@alistair23.me>
Acked-by: Rob Herring <robh@kernel.org>
[bentiss: silence checkpatch warnings]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211208124045.61815-3-alistair@alistair23.me
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Add a HID_QUIRK_X_INVERT/HID_QUIRK_Y_INVERT quirk that can be used
to invert the X/Y values.
Signed-off-by: Alistair Francis <alistair@alistair23.me>
[bentiss: silence checkpatch warning]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211208124045.61815-2-alistair@alistair23.me
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Currently, the table that stores information about the connected hidraw
devices has a mutex to prevent concurrent hidraw users to manipulate the
hidraw table (e.g. delete an entry) while someone is trying to use
the table (e.g. issuing an ioctl to the device), preventing the kernel
to referencing a NULL pointer. However, since that every user that wants
to access the table for both manipulating it and reading it content,
this prevents concurrent access to the table for read-only operations
for different or the same device (e.g. two hidraw ioctls can't happen at
the same time, even if they are completely unrelated).
This proves to be a bottleneck and gives performance issues when using
multiple HID devices at same time, like VR kits where one can have two
controllers, the headset and some tracking sensors.
To improve the performance, replace the table mutex with a read-write
semaphore, enabling multiple threads to issue parallel syscalls to
multiple devices at the same time while protecting the table for
concurrent modifications.
Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211130132957.8480-2-andrealmeid@collabora.com
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Fix the following coccicheck REVIEW:
Use swap() instead of reimplementing it.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: chiminghao <chi.minghao@zte.com.cn>
[bentiss: rewrote commit title]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211109082610.131341-1-chi.minghao@zte.com.cn
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Add USI defined usages to the HID debug code.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211210111138.1248187-6-tero.kristo@linux.intel.com
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This function is not called outside of hid-input.c so we can make it
static.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211210111138.1248187-5-tero.kristo@linux.intel.com
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This and HID_DG_STYLUS are pretty much the same thing so add suffix for
HID_DG_PEN too. This makes the input device name look better.
While doing this, remove the suffix override from hid-multitouch, as it
is now handled by hid-input. Also, the suffix override done by
hid-multitouch was wrong, as it mapped HID_DG_PEN => "Stylus" and
HID_DG_STYLUS => "Pen".
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
[bentiss: amended to keep the same name for hid-multitouch devices]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211210111138.1248187-3-tero.kristo@linux.intel.com
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Since we are going to have more MSC events too, add map_msc() that can
be used to fill in necessary fields and avoid boilerplate code.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211210111138.1248187-2-tero.kristo@linux.intel.com
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Battery status is reported for the Asus UX550VE touchscreen even though
it does not have a battery. Prevent it from always reporting the
battery as low.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1897823
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Fixes spurious wakeups from s0ix on Lenovo ThinkPad X1 Cargon Gen 9 on
lid close.
These wakeups are generated by interrupts from the ISH on changes to the
lid status.
By disabling the wake IRQ from the ISH we inhibit these spurious
wakeups while keeping the resume from LID open through the ACPI
interrupt.
Reports on the Lenovo forums indicate that Lenovo ThinkPad X1 Yoga Gen6
is also affected.
Fixes: ae02e5d40d5f ("HID: intel-ish-hid: ipc layer")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214855
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211130060117.3026-1-linux@weissschuh.net
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Add one additional hammer-like device.
Signed-off-by: xiazhengqiao <xiazhengqiao@huaqin.corp-partner.google.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211203030119.28612-1-xiazhengqiao@huaqin.corp-partner.google.com
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The prodikeys HID driver only controls USB devices, yet did not have a
dependancy on USB_HID. This causes build errors on some configurations
like nios2 when building due to new changes to the prodikeys driver.
Reported-by: kernel test robot <lkp@intel.com>
Cc: stable@vger.kernel.org
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211203081231.2856936-1-gregkh@linuxfoundation.org
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The chicony HID driver only controls USB devices, yet did not have a
dependancy on USB_HID. This causes build errors on some configurations
like sparc when building due to new changes to the chicony driver.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: stable@vger.kernel.org
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211203075927.2829218-1-gregkh@linuxfoundation.org
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We don't gain much by having them as inline, and it
actually prevents us to attach a probe to those helpers.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20211202095334.14399-5-benjamin.tissoires@redhat.com
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There is a lot of duplication of code in the HID low level drivers.
Better have everything in one place so we can eventually extend it
in a generic way.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20211202095334.14399-4-benjamin.tissoires@redhat.com
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When emulating the device through uhid, there is a chance we don't have
output reports and so report_field is null.
Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20211202095334.14399-3-benjamin.tissoires@redhat.com
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When the setup of the GHL fails, we are not calling hid_hw_stop().
This leads to the hidraw node not being released, meaning a crash
whenever somebody attempts to open the file.
Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20211202095334.14399-2-benjamin.tissoires@redhat.com
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Some HID drivers are only for USB drivers, yet did not depend on
CONFIG_USB_HID. This was hidden by the fact that the USB functions were
stubbed out in the past, but now that drivers are checking for USB
devices properly, build errors can occur with some random
configurations.
Reported-by: kernel test robot <lkp@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211202114819.2511954-1-gregkh@linuxfoundation.org
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Many HID drivers assume that the HID device assigned to them is a USB
device as that was the only way HID devices used to be able to be
created in Linux. However, with the additional ways that HID devices
can be created for many different bus types, that is no longer true, so
properly check that we have a USB device associated with the HID device
before allowing a driver that makes this assumption to claim it.
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Michael Zaidman <michael.zaidman@gmail.com>
Cc: Stefan Achatz <erazor_de@users.sourceforge.net>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: linux-input@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
[bentiss: amended for thrustmater.c hunk to apply]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211201183503.2373082-3-gregkh@linuxfoundation.org
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