commit 0ffa0285052607513a29f529ddb5061c907fd8a6
author Hans-Peter Nilsson <hans-peter.nilsson@axis.com> Mon Feb 12 00:52:45 2007 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Mon Feb 12 09:48:31 2007 -0800
tree d7072494d6d8005c60d42c1c841628c7d486dd9a
parent 7f8c7619ea1ff5ab8e0b08c8120d629834ef4253

[PATCH] SPI cleanup() method param becomes non-const

I'd like to assign NULL to kfree()d members of a structure.  I can't do
that without ugly casting (see the PXA patch) when the structure pointed to
is const-qualified.  I don't really see a reason why the cleanup method
isn't allowed to alter the object it should clean up.  :-)

No, I didn't test the PXA patch, but I verified that the NULL-assignment
doesn't stop me from doing rmmod/insmodding my own spi_bitbang-based
driver.

Signed-off-by: Hans-Peter Nilsson <hp@axis.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/spi/pxa2xx_spi.c

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index 8b41f9c..9f2c887 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -1214,9 +1214,9 @@
 	return 0;
 }
 
-static void cleanup(const struct spi_device *spi)
+static void cleanup(struct spi_device *spi)
 {
-	struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
+	struct chip_data *chip = spi_get_ctldata(spi);
 
 	kfree(chip);
 }

drivers/spi/spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 6307428..2328128 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -32,7 +32,7 @@
  */
 static void spidev_release(struct device *dev)
 {
-	const struct spi_device	*spi = to_spi_device(dev);
+	struct spi_device	*spi = to_spi_device(dev);
 
 	/* spi masters may cleanup for released devices */
 	if (spi->master->cleanup)

drivers/spi/spi_bitbang.c

diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index a5dadc7..24a330d 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -238,7 +238,7 @@
 /**
  * spi_bitbang_cleanup - default cleanup for per-word I/O loops
  */
-void spi_bitbang_cleanup(const struct spi_device *spi)
+void spi_bitbang_cleanup(struct spi_device *spi)
 {
 	kfree(spi->controller_state);
 }

include/linux/spi/spi.h

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 851b25d..9d8d631 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -220,7 +220,7 @@
 						struct spi_message *mesg);
 
 	/* called on release() to free memory provided by spi_master */
-	void			(*cleanup)(const struct spi_device *spi);
+	void			(*cleanup)(struct spi_device *spi);
 };
 
 static inline void *spi_master_get_devdata(struct spi_master *master)

include/linux/spi/spi_bitbang.h

diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h
index 16ce178..2e8c048 100644
--- a/include/linux/spi/spi_bitbang.h
+++ b/include/linux/spi/spi_bitbang.h
@@ -55,7 +55,7 @@
  * methods, if you like.
  */
 extern int spi_bitbang_setup(struct spi_device *spi);
-extern void spi_bitbang_cleanup(const struct spi_device *spi);
+extern void spi_bitbang_cleanup(struct spi_device *spi);
 extern int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m);
 extern int spi_bitbang_setup_transfer(struct spi_device *spi,
 				      struct spi_transfer *t);