From: Hans Verkuil Date: Sat, 13 Dec 2014 11:52:53 +0000 (-0300) Subject: [media] ivtv: fix sparse warning X-Git-Tag: v4.0-rc1~130^2~287 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d832672f2038d7b36dc08636468cbbed4afe625b;p=karo-tx-linux.git [media] ivtv: fix sparse warning 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 Cc: Andy Walls Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/pci/ivtv/ivtv-irq.c b/drivers/media/pci/ivtv/ivtv-irq.c index ab6d5d25aa6f..e7d701777e53 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)