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

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commit fb57862ead 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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko
2014-09-12 15:11:58 +03:00
committed by Greg Kroah-Hartman
parent 3f8ae85b8a
commit 0ee097ac8e
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 @@ 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);
}