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media: ddbridge: fix output buffer check

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A 188 byte gap has to be left between the writer and the consumer. This
requires 2*188 bytes available to be able to write to the output buffers.
So, change ddb_output_free() to report free bytes according to this rule.

Picked up from the upstream dddvb-0.9.33 release.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Daniel Scheller 2018-04-09 12:47:44 -04:00 committed by Mauro Carvalho Chehab
parent e415eec458
commit 28473a197a
1 changed files with 2 additions and 2 deletions
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4
drivers/media/pci/ddbridge/ddbridge-core.c
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@ -572,12 +572,12 @@ static u32 ddb_output_free(struct ddb_output *output)
if (output->dma->cbuf != idx) {
if ((((output->dma->cbuf + 1) % output->dma->num) == idx) &&
(output->dma->size - output->dma->coff <= 188))
(output->dma->size - output->dma->coff <= (2 * 188)))
return 0;
return 188;
}
diff = off - output->dma->coff;
if (diff <= 0 || diff > 188)
if (diff <= 0 || diff > (2 * 188))
return 188;
return 0;
}