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spi: bcm2835: Add spi_master_get() call to prevent use after free

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The call to spi_unregister_master results in device memory being freed, it must
no longer be accessed afterwards. Thus call spi_master_get() to get an extra
reference to the device and call spi_master_put() only after the last access to
device data.

Note, current code has an extra spi_master_put() call in bcm2835_spi_remove().
Thus this patch just adds an spi_master_get() to balance the reference count.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Axel Lin 2013-08-22 23:19:07 +08:00 committed by Mark Brown
parent c2b6a3a82d
commit 7bc003100b
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-bcm2835.c
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@ -377,7 +377,7 @@ out_master_put:
static int bcm2835_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
struct bcm2835_spi *bs = spi_master_get_devdata(master);
free_irq(bs->irq, master);