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| author | Anssi Hannula <anssi.hannula@gmail.com> | 2008-10-04 14:44:06 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2008-10-14 23:51:02 +0200 |
| commit | f129ea6d1efe0eddcbb1f0faaec5623788ad9e58 (patch) | |
| tree | 4a2b72a2f98b19efeb5e28837ed1bfacffbbc961 /drivers/hid/usbhid/hid-pidff.c | |
| parent | dded364bf4e1f0de67d7d7b9e77c06b23a9f081f (diff) | |
| download | talos-obmc-linux-f129ea6d1efe0eddcbb1f0faaec5623788ad9e58.tar.gz talos-obmc-linux-f129ea6d1efe0eddcbb1f0faaec5623788ad9e58.zip | |
HID: fix a lockup regression when using force feedback on a PID device
Commit 8006479c9b75fb6594a7b746af3d7f1fbb68f18f introduced a spinlock in
input_dev->event_lock, which is locked when handling input events.
However, the hid-pidff driver sleeps when handling events as it waits for
reports being sent to the device before changing the report contents
again.
This causes a system lockup when trying to use force feedback with a PID
device, a regression introduced in 2.6.24 and 2.6.23.15.
Fix it by extracting the raw report data from struct hid_report
immediately when hid_submit_report() is called, therefore allowing
drivers to change the contents of struct hid_report immediately without
affecting the already-queued transfer.
In hid-pidff, re-add the removed usbhid_wait_io() to
pidff_erase_effect() instead, to prevent a full report queue from causing
the submission to fail, thus not freeing up device memory.
pidff_erase_effect() is not called while dev->event_lock is held.
Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/usbhid/hid-pidff.c')
| -rw-r--r-- | drivers/hid/usbhid/hid-pidff.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c index 011326178c06..484e3eec2f88 100644 --- a/drivers/hid/usbhid/hid-pidff.c +++ b/drivers/hid/usbhid/hid-pidff.c @@ -397,7 +397,6 @@ static void pidff_set_condition_report(struct pidff_device *pidff, effect->u.condition[i].left_saturation); pidff_set(&pidff->set_condition[PID_DEAD_BAND], effect->u.condition[i].deadband); - usbhid_wait_io(pidff->hid); usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONDITION], USB_DIR_OUT); } @@ -512,7 +511,6 @@ static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n) pidff->effect_operation[PID_LOOP_COUNT].value[0] = n; } - usbhid_wait_io(pidff->hid); usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION], USB_DIR_OUT); } @@ -548,6 +546,9 @@ static int pidff_erase_effect(struct input_dev *dev, int effect_id) int pid_id = pidff->pid_id[effect_id]; debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]); + /* Wait for the queue to clear. We do not want a full fifo to + prevent the effect removal. */ + usbhid_wait_io(pidff->hid); pidff_playback_pid(pidff, pid_id, 0); pidff_erase_pid(pidff, pid_id); |
