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(parent: d846b76) | patch
USB: appledisplay: fix race between reading and writing from the device
authorOliver Neukum <oneukum@suse.de>
Mon, 19 May 2014 11:53:55 +0000 (13:53 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 27 May 2014 23:03:57 +0000 (16:03 -0700)
commit552e1f2679b7b766b8b8de3dc6d83d9cd28f28b2
tree1e696b32dccada97e0aa1431daf1f8c8a23a0d75tree | snapshot (tar.gz zip)
parentd846b7650db3fcca7901b6e23f6416c3601a3dfecommit | diff
USB: appledisplay: fix race between reading and writing from the device

The workqueue handler may call appledisplay_bl_get_brightness() while
user space calls appledisplay_bl_update_status(). As they share a
buffer that must not happen. Use a mutex for mutual exclusion.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/misc/appledisplay.c diff | blob | blame | history