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spi: dw-mid: check that DMA was inited before exit 

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: 7063c0d942 (spi/dw_spi: add DMA support)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2014-09-12 15:11:58 +03:00 committed by Mark Brown
parent 05ed2aee3e
commit fb57862ead
1 changed files with 2 additions and 0 deletions
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2
drivers/spi/spi-dw-mid.c
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@ -89,6 +89,8 @@ static int mid_spi_dma_init(struct dw_spi *dws)
static void mid_spi_dma_exit(struct dw_spi *dws) static void mid_spi_dma_exit(struct dw_spi *dws)
{ {
if (!dws->dma_inited)
return;
dma_release_channel(dws->txchan); dma_release_channel(dws->txchan);
dma_release_channel(dws->rxchan); dma_release_channel(dws->rxchan);
} }