From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Fix this warning:
drivers/media/pci/ivtv/ivtv-irq.c:418:9: warning: context imbalance in 'ivtv_dma_stream_dec_prepare' - different lock contexts for basic block
sparse didn't quite understand the locking scheme, so rewrite it to keep
sparse happy.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Cc: Andy Walls <awalls@xxxxxxxxxxxxxxxx>
---
drivers/media/pci/ivtv/ivtv-irq.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/drivers/media/pci/ivtv/ivtv-irq.c b/drivers/media/pci/ivtv/ivtv-irq.c
index ab6d5d2..e7d7017 100644
--- a/drivers/media/pci/ivtv/ivtv-irq.c
+++ b/drivers/media/pci/ivtv/ivtv-irq.c
@@ -357,7 +357,6 @@ void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
u32 uv_offset = offset + IVTV_YUV_BUFFER_UV_OFFSET;
int y_done = 0;
int bytes_written = 0;
- unsigned long flags = 0;
int idx = 0;
IVTV_DEBUG_HI_DMA("DEC PREPARE DMA %s: %08x %08x\n", s->name, s->q_predma.bytesused, offset);
@@ -407,16 +406,21 @@ void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
/* Sync Hardware SG List of buffers */
ivtv_stream_sync_for_device(s);
- if (lock)
+ if (lock) {
+ unsigned long flags = 0;
+
spin_lock_irqsave(&itv->dma_reg_lock, flags);
- if (!test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
- ivtv_dma_dec_start(s);
- }
- else {
- set_bit(IVTV_F_S_DMA_PENDING, &s->s_flags);
- }
- if (lock)
+ if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
+ ivtv_dma_dec_start(s);
+ else
+ set_bit(IVTV_F_S_DMA_PENDING, &s->s_flags);
spin_unlock_irqrestore(&itv->dma_reg_lock, flags);
+ } else {
+ if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
+ ivtv_dma_dec_start(s);
+ else
+ set_bit(IVTV_F_S_DMA_PENDING, &s->s_flags);
+ }
}
static void ivtv_dma_enc_start_xfer(struct ivtv_stream *s)
--
2.1.3
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