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| author | Bryan O'Donoghue <pure.logic@nexus-software.ie> | 2017-11-06 04:32:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-06 18:41:22 +0300 |
| commit | 5a70524bbf3b2764a2e2cd32f5109fd22c8a135f (patch) | |
| tree | 3a1ae8205f7cf167b132bc19d2b408bf406ab8f4 /drivers/staging | |
| parent | 31408d16c21bf19587bf7c862354ea1b37a2ed9c (diff) | |
| download | linux-5a70524bbf3b2764a2e2cd32f5109fd22c8a135f.tar.xz | |
staging: greybus: loopback: Hold per-connection mutex across operations
Commit d9fb3754ecf8 ("greybus: loopback: Relax locking during loopback
operations") changes the holding of the per-connection mutex to be less
restrictive because at the time of that commit per-connection mutexes were
encapsulated by a per-driver level gb_dev.mutex.
Commit 8e1d6c336d74 ("greybus: loopback: drop bus aggregate calculation")
on the other hand subtracts the driver level gb_dev.mutex but neglects to
move the mutex back to the place it was prior to commit d9fb3754ecf8
("greybus: loopback: Relax locking during loopback operations"), as a
result several members of the per connection struct gb_loopback are racy.
The solution is restoring the old location of mutex_unlock(&gb->mutex) as
it was in commit d9fb3754ecf8 ("greybus: loopback: Relax locking during
loopback operations").
Fixes: 8e1d6c336d74 ("greybus: loopback: drop bus aggregate calculation")
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Reviewed-by: Johan Hovold <johan@kernel.org>
Cc: Alex Elder <elder@kernel.org>
Cc: Mitch Tasman <tasman@leaflabs.com>
Cc: greybus-dev@lists.linaro.org
Cc: devel@driverdev.osuosl.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/greybus/loopback.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index 3d92638c424b..20d1b4505817 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -605,7 +605,6 @@ static int gb_loopback_async_operation(struct gb_loopback *gb, int type, op_async->ts = ktime_get(); op_async->pending = true; atomic_inc(&gb->outstanding_operations); - mutex_lock(&gb->mutex); ret = gb_operation_request_send(operation, gb_loopback_async_operation_callback, 0, @@ -622,7 +621,6 @@ static int gb_loopback_async_operation(struct gb_loopback *gb, int type, error: gb_loopback_async_operation_put(op_async); done: - mutex_unlock(&gb->mutex); return ret; } @@ -1013,7 +1011,6 @@ static int gb_loopback_fn(void *data) type = gb->type; if (ktime_to_ns(gb->ts) == 0) gb->ts = ktime_get(); - mutex_unlock(&gb->mutex); /* Else operations to perform */ if (gb->async) { @@ -1041,6 +1038,7 @@ static int gb_loopback_fn(void *data) gb_loopback_calculate_stats(gb, !!error); } gb->send_count++; + mutex_unlock(&gb->mutex); if (us_wait) { if (us_wait < 20000) |