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Commit 28473a19 authored by Daniel Scheller's avatar Daniel Scheller Committed by Mauro Carvalho Chehab
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media: ddbridge: fix output buffer check 



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: default avatarDaniel Scheller <d.scheller@gmx.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent e415eec4

drivers/media/pci/ddbridge/ddbridge-core.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

}