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module->id is used as an argument to ida_simple_remove(). Since module
is already dereferenced, module->id might contain invalid data. So fix
this.
Fixes: da4cc2d0b066 ("audio:gb_manager: Use proper locking around kobject_xxx")
Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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Function gb_audio_manager_remove_all() to remove all audio modules,
doesn't control correctly 'ida' counting.
Signed-off-by: Dinko Mironov <dmironov@mm-sol.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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read/write_lock_irqsave mechanism was used to protect modules
list & kobject_xxx() in gb_audio_manager. Since kobject_xxx calls
can sleep spin_lock variants can't be used there. So use rw_sem
for protecting modules_list.
Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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There's a definition missing in audio_manager causing the kernel build
to fail:
CC [M] ./greybus/audio_manager.o
./greybus/audio_manager.c:22:8: warning: type defaults to 'int' in declaration of 'DEFINE_IDA' [-Wimplicit-int]
error, forbidden warning: audio_manager.c:22
./kernel/scripts/Makefile.build:308: recipe for target './greybus/audio_manager.o' failed
Including linux/idr.h fixes the issue.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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Every time we hotplug an audio module, we get a new audio module id. We
should recycle them instead of just constantly incrementing the number
so we don't see things like:
[178016.832580] Created audio module #6124
in the kernel logs.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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This is a simple module that keeps a list of connected GB audio
modules.
Whenever a device is attached, an appropriate uevent is sent to
userspace:
UDEV [4941.803215] add /kernel/gb_audio_manager/0 (gb_audio_manager)
ACTION=add
CPORT=99
DEVICES=0x10
DEVPATH=/kernel/gb_audio_manager/0
NAME=naim
PID=64
SEQNUM=1828
SLOT=2
SUBSYSTEM=gb_audio_manager
USEC_INITIALIZED=802416
VID=128
And whenever removed:
UDEV [4941.836588] remove /kernel/gb_audio_manager/0 (gb_audio_manager)
ACTION=remove
DEVPATH=/kernel/gb_audio_manager/0
SEQNUM=1833
SUBSYSTEM=gb_audio_manager
USEC_INITIALIZED=835681
The API consists of functions for adding, removing and inspecting
added device module descriptions (struct gb_audio_module):
int gb_audio_manager_add(struct gb_audio_module_descriptor *desc);
int gb_audio_manager_remove(int id);
int gb_audio_manager_remove_all(void);
struct gb_audio_module* gb_audio_manager_get_module(int id);
void gb_audio_manager_put_module(struct gb_audio_module *module);
int gb_audio_manager_dump_module(int id);
void gb_audio_manager_dump_all(void);
Devices can be inspected through sysfs in /sys/kernel/gb_audio_manager/{id}/*
If GB_AUDIO_MANAGER_SYSFS is exported as 'true', managing devices can be done
via the SYSFS as well. For instance:
echo name=naim slot=2 vid=128 pid=64 cport=99 devices=0x10 > /sys/kernel/gb_audio_manager/add
echo all > /sys/kernel/gb_audio_manager/dump
echo 2 > /sys/kernel/gb_audio_manager/dump
echo 2 > /sys/kernel/gb_audio_manager/remove
Signed-off-by: Svetlin Ankov <ankov_svetlin@projectara.com>
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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