[PATCH 2/3] media: s5p-mfc: Clear workbit to handle error condition

[Smitha T Murthy <smitha.t@samsung.com>]

During error on CLOSE_INSTANCE command, ctx_work_bits was not getting cleared.
During consequent mfc execution NULL pointer dereferencing of this context led
to kernel panic. This patch fixes this issue by making sure to clear
ctx_work_bits always.

Fixes: 818cd91ab8c6e ("[media] s5p-mfc: Extract open/close MFC instance commands)

Cc: stable@vger.kernel.org
Cc: linux-fsd@tesla.com
Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
---
 drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
index 72d70984e99a..6d3c92045c05 100644
--- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
+++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
@@ -468,8 +468,10 @@ void s5p_mfc_close_mfc_inst(struct s5p_mfc_dev *dev, struct s5p_mfc_ctx *ctx)
 	s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
 	/* Wait until instance is returned or timeout occurred */
 	if (s5p_mfc_wait_for_done_ctx(ctx,
-				S5P_MFC_R2H_CMD_CLOSE_INSTANCE_RET, 0))
+				S5P_MFC_R2H_CMD_CLOSE_INSTANCE_RET, 0)){
+		clear_work_bit_irqsave(ctx);
 		mfc_err("Err returning instance\n");
+	}
 
 	/* Free resources */
 	s5p_mfc_hw_call(dev->mfc_ops, release_codec_buffers, ctx);
-- 
2.17.1