From 9e18404adac2e8396335eb8e4cb380f619186042 Mon Sep 17 00:00:00 2001 From: "Lad, Prabhakar" Date: Fri, 14 Sep 2012 10:22:24 -0300 Subject: [PATCH] [media] davinci: vpif: capture/display: fix race condition channel_first_int[][] variable is used as a flag for the ISR, This flag was being set after enabling the interrupts, There where situations when the isr occurred even before the flag was set dues to which it was causing the application hang. This patch sets channel_first_int[][] flag just before enabling the interrupt. Reported-by: David Oleszkiewicz Signed-off-by: Lad, Prabhakar Signed-off-by: Manjunath Hadli Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/davinci/vpif_capture.c | 2 +- drivers/media/platform/davinci/vpif_display.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c index 13aa46d..0bafeca 100644 --- a/drivers/media/platform/davinci/vpif_capture.c +++ b/drivers/media/platform/davinci/vpif_capture.c @@ -339,6 +339,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count) * Set interrupt for both the fields in VPIF Register enable channel in * VPIF register */ + channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1; if ((VPIF_CHANNEL0_VIDEO == ch->channel_id)) { channel0_intr_assert(); channel0_intr_enable(1); @@ -350,7 +351,6 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count) channel1_intr_enable(1); enable_channel1(1); } - channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1; return 0; } diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c index 8003c56..a5b8868 100644 --- a/drivers/media/platform/davinci/vpif_display.c +++ b/drivers/media/platform/davinci/vpif_display.c @@ -302,6 +302,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count) /* Set interrupt for both the fields in VPIF Register enable channel in VPIF register */ + channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1; if (VPIF_CHANNEL2_VIDEO == ch->channel_id) { channel2_intr_assert(); channel2_intr_enable(1); @@ -318,7 +319,6 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count) if (vpif_config_data->ch3_clip_en) channel3_clipping_enable(1); } - channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1; return 0; } -- 2.7.4