xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

USB: HWA: fix device probe failure

Browse Source 
This patch fixes a race condition that caused the HWA_HC interface probe
function to occasionally fail.  The HWA_HC would attempt to register
itself with the HWA_RC by searching for a uwb_rc class device with the
same parent device ptr.  If the probe function for the HWA_RC interface
had yet to run, the uwb_rc class device would not have been created
causing the look up to fail and the HWA_HC probe function to return an
error causing the device to be unusable.

The fix is for the HWA to delay registering with the HWA_RC until
receiving the command from userspace to start the wireless channel.  It
is the responsibility of userspace to ensure that the uwb_rc class
device has been created before starting the HWA channel.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Pugliese
2013-06-24 14:26:35 -05:00
committed by Greg Kroah-Hartman
parent 6e6581e0a9
commit a899575191
7 changed files with 42 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/uwb/uwb-internal.h
View File

@@ -55,7 +55,8 @@ static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
static inline void __uwb_rc_put(struct uwb_rc *rc)
{
uwb_dev_put(&rc->uwb_dev);
if (rc)
uwb_dev_put(&rc->uwb_dev);
}
extern int uwb_rc_reset(struct uwb_rc *rc);