From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit fb57862ead652454ceeb659617404c5f13bc34b5 upstream.
If the driver was compiled with DMA support, but DMA channels weren't acquired
by some reason, mid_spi_dma_exit() will crash the kernel.
Fixes: 7063c0d942a1 (spi/dw_spi: add DMA support)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/spi/spi-dw-mid.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
index 58fa14d27ffa..b8ac40c8a22d 100644
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c
@@ -89,6 +89,8 @@ err_exit:
static void mid_spi_dma_exit(struct dw_spi *dws)
{
+ if (!dws->dma_inited)
+ return;
dma_release_channel(dws->txchan);
dma_release_channel(dws->rxchan);
}
--
2.1.2
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