tree 98707dfac7c9533dbfef30c4ff05c0dfdabc17a6
parent 2e9521fd656f05a716b5294a7dbebd37ced05e43
author Milton Miller <miltonm@bga.com> 1305732459 -0500
committer Grant Likely <grant.likely@secretlab.ca> 1305735576 -0600

of: fix race when matching drivers

If two drivers are probing devices at the same time, both will write
their match table result to the dev->of_match cache at the same time.

Only write the result if the device matches.

In a thread titled "SBus devices sometimes detected, sometimes not",
Meelis reported his SBus hme was not detected about 50% of the time.
From the debug suggested by Grant it was obvious another driver matched
some devices between the call to match the hme and the hme discovery
failling.

Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Milton Miller <miltonm@bga.com>
[grant.likely: modified to only call of_match_device() once]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>