[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>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 791c4dc550a..94f5e8ed83a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -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);