ARM: PL08x: prevent dma_set_runtime_config() reconfiguring memcpy channels
Prevent dma_set_runtime_config() being used to alter the configuration
supplied by the platform for memcpy channel configuration. No one
should be trying to change this configuration.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index c7f7b82..bebc678 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -1129,6 +1129,9 @@
u32 cctl = 0;
int i;
+ if (!plchan->slave)
+ return -EINVAL;
+
/* Transfer direction */
plchan->runtime_direction = config->direction;
if (config->direction == DMA_TO_DEVICE) {