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spi: fix double-free on spi_unregister_master

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After 49dce689ad, device_for_each_child
iteration hits the master device itself.  Do not call spi_unregister_device()
for the master device.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Atsushi Nemoto 2007-11-14 16:59:22 -08:00 committed by Linus Torvalds
parent cbff2fbf55
commit 350d0076c5
1 changed files with 5 additions and 3 deletions
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8
drivers/spi/spi.c
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@ -457,10 +457,11 @@ int spi_register_master(struct spi_master *master)
EXPORT_SYMBOL_GPL(spi_register_master); EXPORT_SYMBOL_GPL(spi_register_master);
static int __unregister(struct device *dev, void *unused) static int __unregister(struct device *dev, void *master_dev)
{ {
/* note: before about 2.6.14-rc1 this would corrupt memory: */ /* note: before about 2.6.14-rc1 this would corrupt memory: */
spi_unregister_device(to_spi_device(dev)); if (dev != master_dev)
spi_unregister_device(to_spi_device(dev));
return 0; return 0;
} }
@ -478,7 +479,8 @@ void spi_unregister_master(struct spi_master *master)
{ {
int dummy; int dummy;
dummy = device_for_each_child(master->dev.parent, NULL, __unregister); dummy = device_for_each_child(master->dev.parent, &master->dev,
__unregister);
device_unregister(&master->dev); device_unregister(&master->dev);
} }
EXPORT_SYMBOL_GPL(spi_unregister_master); EXPORT_SYMBOL_GPL(spi_unregister_master);