dma: coh901318: avoid unbalanced locking

In case the len is 0 we must return without trying to unlock the lock that was
not locked.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/coh901318_lli.c b/drivers/dma/coh901318_lli.c
index 780e0429b38cd30236001e4a121cefc6fa347aea..fe9cc5eeddaed222ac17d93dfb71ebdcace99124 100644 (file)
--- a/drivers/dma/coh901318_lli.c
+++ b/drivers/dma/coh901318_lli.c
@@ -61,7 +61,7 @@ coh901318_lli_alloc(struct coh901318_pool *pool, unsigned int len)
        dma_addr_t phy;
 
        if (len == 0)
-               goto err;
+               return NULL;
 
        spin_lock(&pool->lock);