[PATCH -next] dmaengine: at_xdmac: Fix missing unlock in at_xdmac_tasklet()

[Yang Yingliang]

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 at huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang at huawei.com>
---
 drivers/dma/at_xdmac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index a1da2b4b6d73..1476156af74b 100644
--- 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);
-- 
2.25.1