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>
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