V4L/DVB (6043): ivtv: fix incorrect round-robin implementation

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c
index 88c6f4ff5c6d..a97d55fd2277 100644
--- a/drivers/media/video/ivtv/ivtv-irq.c
+++ b/drivers/media/video/ivtv/ivtv-irq.c
@@ -859,8 +859,9 @@ irqreturn_t ivtv_irq_handler(int irq, void *dev_id)
         }
 
         if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
+                itv->irq_rr_idx++;
                 for (i = 0; i < IVTV_MAX_STREAMS; i++) {
-                        int idx = (i + itv->irq_rr_idx++) % IVTV_MAX_STREAMS;
+                        int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
                         struct ivtv_stream *s = &itv->streams[idx];
 
                         if (!test_and_clear_bit(IVTV_F_S_DMA_PENDING, &s->s_flags))
@@ -877,8 +878,9 @@ irqreturn_t ivtv_irq_handler(int irq, void *dev_id)
         }
 
         if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_PIO, &itv->i_flags)) {
+                itv->irq_rr_idx++;
                 for (i = 0; i < IVTV_MAX_STREAMS; i++) {
-                        int idx = (i + itv->irq_rr_idx++) % IVTV_MAX_STREAMS;
+                        int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
                         struct ivtv_stream *s = &itv->streams[idx];
 
                         if (!test_and_clear_bit(IVTV_F_S_PIO_PENDING, &s->s_flags))