sh: fix Oops in the serial SCI driver
Fix an Oops, triggering, if the DMA buffer allocation for the Rx channel in
sh-sci.c fails.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 4f73fb7..5f90fcd 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -1004,8 +1004,9 @@
s->chan_rx = NULL;
s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL;
dma_release_channel(chan);
- dma_free_coherent(port->dev, s->buf_len_rx * 2,
- sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
+ if (sg_dma_address(&s->sg_rx[0]))
+ dma_free_coherent(port->dev, s->buf_len_rx * 2,
+ sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
if (enable_pio)
sci_start_rx(port);
}