media: s5p-mfc: Clear workbit to handle error condition

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: 818cd91ab8c6 ("[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>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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 72d7098..6d3c920 100644 (file)
--- 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);