From ba40be0fa21afd10a66bdfaee37d3ebcd9187c05 Mon Sep 17 00:00:00 2001 From: Minghsiu Tsai Date: Tue, 14 Mar 2017 11:21:22 -0300 Subject: [PATCH] [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 Acked-by: Rick Chang Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c index 68da53133d30..229eccce6b0d 100644 --- 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);