[media] media: mtk-jpeg: fix continuous log "Context is NULL"

The symptom is continuous log "mtk-jpeg 18004000.jpegdec: Context is NULL"
in kernel log. It is because the error handling in irq doesn't clear
interrupt.

The calling flow like as below when issue happen
mtk_jpeg_device_run()
mtk_jpeg_job_abort()
  v4l2_m2m_job_finish() -> m2m_dev->curr_ctx = NULL;
mtk_jpeg_dec_irq()
  v4l2_m2m_get_curr_priv()
     -> m2m_dev->curr_ctx == NULL
     -> return NULL
log "Context is NULL"

There is race condition between job_abort() and irq. In order to simplify
code, don't want to add extra flag to maintain state, empty job_abort() and
clear interrupt before v4l2_m2m_get_curr_priv() in irq.

Signed-off-by: Minghsiu Tsai <minghsiu.tsai@mediatek.com>
Acked-by: Rick Chang <rick.chang@mediatek.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
index 68da531..229eccc 100644 (file)
--- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
@@ -863,15 +863,6 @@ static int mtk_jpeg_job_ready(void *priv)
 
 static void mtk_jpeg_job_abort(void *priv)
 {
-       struct mtk_jpeg_ctx *ctx = priv;
-       struct mtk_jpeg_dev *jpeg = ctx->jpeg;
-       struct vb2_buffer *src_buf, *dst_buf;
-
-       src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
-       dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
-       v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf), VB2_BUF_STATE_ERROR);
-       v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf), VB2_BUF_STATE_ERROR);
-       v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
 }
 
 static struct v4l2_m2m_ops mtk_jpeg_m2m_ops = {
@@ -942,6 +933,8 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv)
        u32 dec_ret;
        int i;
 
+       dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base);
+       dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret);
        ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
        if (!ctx) {
                v4l2_err(&jpeg->v4l2_dev, "Context is NULL\n");
@@ -952,9 +945,6 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv)
        dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
        jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(src_buf);
 
-       dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base);
-       dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret);
-
        if (dec_irq_ret >= MTK_JPEG_DEC_RESULT_UNDERFLOW)
                mtk_jpeg_dec_reset(jpeg->dec_reg_base);