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

[stephen@streetfiresound.com]

From: Stephen Street <stephen@streetfiresound.com>

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>
---

 spi.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

--- linux-2.6.16-rc2/drivers/spi/spi.c	2006-02-06 18:39:31.746537258 -0800
+++ linux-spi/drivers/spi/spi.c	2006-02-06 18:39:45.353334421 -0800
@@ -90,7 +90,7 @@ static int spi_suspend(struct device *de
 	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_ma
 {
 	(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);
 
-
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