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HID: thingm: fix workqueue race on remove 

thingm_remove_rgb() needs to flush the workqueue after all the LED classes
have been unregistered, otherwise the removal might race with another LED
event coming, causing thingm_led_set() to schedule additional work after
thingm_remove_rgb() has flushed it. This obviously causes oops later, as
the scheduled work has been freed in the meantime.

In addition to that, move the hid_hw_stop() to an earlier place, so that
dmesg is not polluted by failure messages about not being able to write
the LED while the device is being shut down.

Reported-and-tested-by: Dylan Alex Simon <dylan-kernel@dylex.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina 2014-09-04 08:56:06 +02:00
parent 8f507ef522
commit 67a9784583
1 changed files with 3 additions and 3 deletions
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6
drivers/hid/hid-thingm.c
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@ -208,10 +208,10 @@ unregister_red:
static void thingm_remove_rgb(struct thingm_rgb *rgb)
{
flush_work(&rgb->work);
led_classdev_unregister(&rgb->red.ldev);
led_classdev_unregister(&rgb->green.ldev);
led_classdev_unregister(&rgb->blue.ldev);
flush_work(&rgb->work);
}
static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id)
@ -286,10 +286,10 @@ static void thingm_remove(struct hid_device *hdev)
struct thingm_device *tdev = hid_get_drvdata(hdev);
int i;
hid_hw_stop(hdev);
for (i = 0; i < tdev->fwinfo->numrgb; ++i)
thingm_remove_rgb(tdev->rgb + i);
hid_hw_stop(hdev);
}
static const struct hid_device_id thingm_table[] = {