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: Jassi Brar <jassi.brar@samsung.com>
[ben-linux@fluff.org: Updated patch comment]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-s3c64xx/dma.c b/arch/arm/plat-s3c64xx/dma.c
index 266a107..6fa706f 100644
--- a/arch/arm/plat-s3c64xx/dma.c
+++ b/arch/arm/plat-s3c64xx/dma.c
@@ -339,6 +339,7 @@
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 @@
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 @@
s3c64xx_lli_to_regs(chan, lli);
}
+ local_irq_restore(flags);
+
show_lli(lli);
dbg_showchan(chan);