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[12/20,media] ddbridge: fix output buffer check

Message ID 20180402182427.20918-13-d.scheller.oss@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Daniel Scheller April 2, 2018, 6:24 p.m. UTC 
From: Daniel Scheller <d.scheller@gmx.net>

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>
---
 drivers/media/pci/ddbridge/ddbridge-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c b/drivers/media/pci/ddbridge/ddbridge-core.c
index c22537eceee5..e9c2e3e5d64b 100644
--- a/drivers/media/pci/ddbridge/ddbridge-core.c
+++ b/drivers/media/pci/ddbridge/ddbridge-core.c
@@ -587,12 +587,12 @@  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;
 }