[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 <doleszki@adsyscontrols.com>
Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 13aa46d..0bafeca 100644 (file)
--- 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 (file)
--- 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;
 }