dmaengine: coh901318: Fix a double lock bug in dma_tc_handle()

commit 36d5d22090d13fd3a7a8c9663a711cbe6970aac8 upstream.

The caller is already holding the lock so this will deadlock.

Fixes: 0b58828c923e ("DMAENGINE: COH 901 318 remove irq counting")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200217144050.3i4ymbytogod4ijn@kili.mountain
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index e51d836..1092d4c 100644 (file)
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -1947,8 +1947,6 @@ static void dma_tc_handle(struct coh901318_chan *cohc)
                return;
        }
 
-       spin_lock(&cohc->lock);
-
        /*
         * When we reach this point, at least one queue item
         * should have been moved over from cohc->queue to
@@ -1969,8 +1967,6 @@ static void dma_tc_handle(struct coh901318_chan *cohc)
        if (coh901318_queue_start(cohc) == NULL)
                cohc->busy = 0;
 
-       spin_unlock(&cohc->lock);
-
        /*
         * This tasklet will remove items from cohc->active
         * and thus terminates them.