dmaengine: at_xdmac: Fix missing unlock in at_xdmac_tasklet()

Add the missing unlock before return from at_xdmac_tasklet().

Fixes: e77e561925df ("dmaengine: at_xdmac: Fix race over irq_status")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20220107024047.1051915-1-yangyingliang@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index a1da2b4..1476156 100644 (file)
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1681,8 +1681,10 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
                __func__, atchan->irq_status);
 
        if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) &&
-           !(atchan->irq_status & error_mask))
+           !(atchan->irq_status & error_mask)) {
+               spin_unlock_irq(&atchan->lock);
                return;
+       }
 
        if (atchan->irq_status & error_mask)
                at_xdmac_handle_error(atchan);