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spi/omap2_mcspi: fix NULL pointer dereference

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Check spi->controller_state before dereferencing.

Shows up NULL here when using spi_alloc_device()/spi_add_device()
and spi_add_device() fails before spi_setup(). Calling spi_dev_put()
on the leftover spi_device results in the error.

Signed-off-by: Scott Ellis <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Scott Ellis 2010-03-10 14:22:45 -07:00 • committed by Grant Likely
commit 5e7749436d
1 changed files with 6 additions and 4 deletions
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10
drivers/spi/omap2_mcspi.c
View file

@ -751,11 +751,13 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
mcspi = spi_master_get_devdata(spi->master);
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
/* Unlink controller state from context save list */
cs = spi->controller_state;
list_del(&cs->node);
if (spi->controller_state) {
/* Unlink controller state from context save list */
cs = spi->controller_state;
list_del(&cs->node);
kfree(spi->controller_state);
kfree(spi->controller_state);
}
if (mcspi_dma->dma_rx_channel != -1) {
omap_free_dma(mcspi_dma->dma_rx_channel);