mmc: core: constify the struct device_type usage

Since commit aed65af ("drivers: make device_type const"), the driver
core can properly handle constant struct device_type. Move the sdio_type,
sd_type and mmc_type variables to be constant structures as well, placing
it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Ricardo B. Marliere <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: rbmarliere

drivers/mmc/core/bus.c

@@ -272,7 +272,7 @@ static void mmc_release_card(struct device *dev)
 /*
  * Allocate and initialise a new MMC card structure.
  */
-struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
+struct mmc_card *mmc_alloc_card(struct mmc_host *host, const struct device_type *type)
 {
 	struct mmc_card *card;
 

drivers/mmc/core/bus.h

@@ -23,7 +23,7 @@ static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *a
 static DEVICE_ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
 
 struct mmc_card *mmc_alloc_card(struct mmc_host *host,
-	struct device_type *type);
+				const struct device_type *type);
 int mmc_add_card(struct mmc_card *card);
 void mmc_remove_card(struct mmc_card *card);
 

drivers/mmc/core/mmc.c

@@ -883,7 +883,7 @@ static struct attribute *mmc_std_attrs[] = {
 };
 ATTRIBUTE_GROUPS(mmc_std);
 
-static struct device_type mmc_type = {
+static const struct device_type mmc_type = {
 	.groups = mmc_std_groups,
 };
 

drivers/mmc/core/sd.c

@@ -805,7 +805,7 @@ static const struct attribute_group sd_std_group = {
 };
 __ATTRIBUTE_GROUPS(sd_std);
 
-struct device_type sd_type = {
+const struct device_type sd_type = {
 	.groups = sd_std_groups,
 };
 

drivers/mmc/core/sd.h

@@ -4,7 +4,7 @@
 
 #include <linux/types.h>
 
-extern struct device_type sd_type;
+extern const struct device_type sd_type;
 
 struct mmc_host;
 struct mmc_card;

drivers/mmc/core/sdio.c

@@ -66,7 +66,7 @@ static struct attribute *sdio_std_attrs[] = {
 };
 ATTRIBUTE_GROUPS(sdio_std);
 
-static struct device_type sdio_type = {
+static const struct device_type sdio_type = {
 	.groups = sdio_std_groups,
 };