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authorDavid Herrmann <dh.herrmann@googlemail.com>2011-08-26 16:06:02 +0400
committerGustavo F. Padovan <padovan@profusion.mobi>2011-10-07 05:15:48 +0400
commit794d175698f0e78be7f2e3f4bdbe0e7cd3f2d6ae (patch)
treee96dcec6fc0ee32252ef51214348fa0066b1f637 /net/bluetooth/hidp
parenta5fd6f300433ef7458c6d934f81f47ebd7c7e805 (diff)
downloadlinux-794d175698f0e78be7f2e3f4bdbe0e7cd3f2d6ae.tar.xz
Bluetooth: hidp: Stop I/O on shutdown
Current hidp driver purges the in/out queue on HID shutdown, but does not prevent further I/O. If a driver uses hidp_output_raw_report or hidp_get_raw_report during shutdown, the driver hangs for 5 or 10 seconds per call until it gets a timeout. That is, if the output queue of an HID driver has 10 messages pending, it will take 50s until hid_destroy_device() will return. The hidp_session_sem semaphore is held during shutdown so no other HID device may be added/removed during this time. This patch makes hidp_output_raw_report and hidp_get_raw_report fail if session->terminate is true. Also hidp_session will wakeup all current calls to these functions to cancel the current operations. We already purge the current I/O queues on hidp_stop(), so this data loss does not change the behaviour of the HID drivers. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Diffstat (limited to 'net/bluetooth/hidp')
-rw-r--r--net/bluetooth/hidp/core.c34
1 files changed, 20 insertions, 14 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 075a3e920caf..d7bae2be83b2 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -255,6 +255,9 @@ static int __hidp_send_ctrl_message(struct hidp_session *session,
BT_DBG("session %p data %p size %d", session, data, size);
+ if (atomic_read(&session->terminate))
+ return -EIO;
+
skb = alloc_skb(size + 1, GFP_ATOMIC);
if (!skb) {
BT_ERR("Can't allocate memory for new frame");
@@ -329,6 +332,7 @@ static int hidp_get_raw_report(struct hid_device *hid,
struct sk_buff *skb;
size_t len;
int numbered_reports = hid->report_enum[report_type].numbered;
+ int ret;
switch (report_type) {
case HID_FEATURE_REPORT:
@@ -352,8 +356,9 @@ static int hidp_get_raw_report(struct hid_device *hid,
session->waiting_report_number = numbered_reports ? report_number : -1;
set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
data[0] = report_number;
- if (hidp_send_ctrl_message(hid->driver_data, report_type, data, 1))
- goto err_eio;
+ ret = hidp_send_ctrl_message(hid->driver_data, report_type, data, 1);
+ if (ret)
+ goto err;
/* Wait for the return of the report. The returned report
gets put in session->report_return. */
@@ -365,11 +370,13 @@ static int hidp_get_raw_report(struct hid_device *hid,
5*HZ);
if (res == 0) {
/* timeout */
- goto err_eio;
+ ret = -EIO;
+ goto err;
}
if (res < 0) {
/* signal */
- goto err_restartsys;
+ ret = -ERESTARTSYS;
+ goto err;
}
}
@@ -390,14 +397,10 @@ static int hidp_get_raw_report(struct hid_device *hid,
return len;
-err_restartsys:
- clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
- mutex_unlock(&session->report_mutex);
- return -ERESTARTSYS;
-err_eio:
+err:
clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
mutex_unlock(&session->report_mutex);
- return -EIO;
+ return ret;
}
static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count,
@@ -422,11 +425,10 @@ static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, s
/* Set up our wait, and send the report request to the device. */
set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
- if (hidp_send_ctrl_message(hid->driver_data, report_type,
- data, count)) {
- ret = -ENOMEM;
+ ret = hidp_send_ctrl_message(hid->driver_data, report_type, data,
+ count);
+ if (ret)
goto err;
- }
/* Wait for the ACK from the device. */
while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
@@ -739,6 +741,10 @@ static int hidp_session(void *arg)
remove_wait_queue(sk_sleep(intr_sk), &intr_wait);
remove_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait);
+ clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
+ clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
+ wake_up_interruptible(&session->report_queue);
+
down_write(&hidp_session_sem);
hidp_del_timer(session);