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[PATCH] spi: Fix modular master driver remove and device suspend/remove 

Fix two problems in the spi subsystem:

1) spi subsystem core dumps when modular spi master is unloaded.
2) spi subsystem core dumps when spi slave device is suspended/resumed and
   module slave driver is not loaded.

Signed-off-by: Stephen Street <stephen@streetfiresound.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Stephen Street 2006-02-20 18:27:56 -08:00 committed by Linus Torvalds
parent d86d43706a
commit d2799f083d
1 changed files with 2 additions and 3 deletions
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5
drivers/spi/spi.c
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@ -90,7 +90,7 @@ static int spi_suspend(struct device *dev, pm_message_t message)
int value;
struct spi_driver *drv = to_spi_driver(dev->driver);
if (!drv->suspend)
if (!drv || !drv->suspend)
return 0;
/* suspend will stop irqs and dma; no more i/o */
@ -105,7 +105,7 @@ static int spi_resume(struct device *dev)
int value;
struct spi_driver *drv = to_spi_driver(dev->driver);
if (!drv->resume)
if (!drv || !drv->resume)
return 0;
/* resume may restart the i/o queue */
@ -449,7 +449,6 @@ void spi_unregister_master(struct spi_master *master)
{
(void) device_for_each_child(master->cdev.dev, NULL, __unregister);
class_device_unregister(&master->cdev);
master->cdev.dev = NULL;
}
EXPORT_SYMBOL_GPL(spi_unregister_master);