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Commit 210012a6 authored by Jassi Brar's avatar Jassi Brar Committed by Ben Dooks
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ARM: S3C64XX: DMA: Protect buffer pointers while manipulation 



Ensure the DMA buffer points are not updated from
another source during the process of enquing a buffer.

Signed-off-by: default avatarJassi Brar <jassi.brar@samsung.com>
[ben-linux@fluff.org: Updated patch comment]
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 799dd75b

arch/arm/plat-s3c64xx/dma.c

+5 −0
Original line number Diff line number Diff line
@@ -339,6 +339,7 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id, 
	struct s3c64xx_dma_buff *next;

	struct s3c64xx_dma_buff *buff;

	struct pl080s_lli *lli;

	unsigned long flags;

	int ret;



	WARN_ON(!chan);
@@ -366,6 +367,8 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id, 


	s3c64xx_dma_fill_lli(chan, lli, data, size);



	local_irq_save(flags);



	if ((next = chan->next) != NULL) {

		struct s3c64xx_dma_buff *end = chan->end;

		struct pl080s_lli *endlli = end->lli;
@@ -397,6 +400,8 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id, 
		s3c64xx_lli_to_regs(chan, lli);

	}



	local_irq_restore(flags);



	show_lli(lli);



	dbg_showchan(chan);