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authorArtem Bityutskiy <dedekind@infradead.org>2006-10-11 14:52:47 +0300
committerArtem Bityutskiy <dedekind@infradead.org>2006-11-29 17:06:38 +0200
commit9c74034f8fc5d93fbe5656421cbbdc4c76ddda28 (patch)
treee5a205e124c0e42899743d765598f82a228156c2
parent9fe912cea32aec18f860c95e8574410b5892481b (diff)
[MTD] return error code from get_mtd_device()
get_mtd_device() returns NULL in case of any failure. Teach it to return an error code instead. Fix all users as well. Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
-rw-r--r--drivers/mtd/maps/nettel.c3
-rw-r--r--drivers/mtd/mtdchar.c5
-rw-r--r--drivers/mtd/mtdcore.c24
-rw-r--r--fs/jffs/jffs_fm.c3
-rw-r--r--fs/jffs2/super.c7
5 files changed, 24 insertions, 18 deletions
diff --git a/drivers/mtd/maps/nettel.c b/drivers/mtd/maps/nettel.c
index f9e8e5bcbc3..528e523245c 100644
--- a/drivers/mtd/maps/nettel.c
+++ b/drivers/mtd/maps/nettel.c
@@ -20,6 +20,7 @@
#include <linux/mtd/partitions.h>
#include <linux/mtd/cfi.h>
#include <linux/reboot.h>
+#include <linux/err.h>
#include <linux/kdev_t.h>
#include <linux/root_dev.h>
#include <asm/io.h>
@@ -178,7 +179,7 @@ int nettel_eraseconfig(void)
init_waitqueue_head(&wait_q);
mtd = get_mtd_device(NULL, 2);
- if (mtd) {
+ if (!IS_ERR(mtd)) {
nettel_erase.mtd = mtd;
nettel_erase.callback = nettel_erasecallback;
nettel_erase.callback = NULL;
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 7c4adc64132..3013d0883b9 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -7,6 +7,7 @@
#include <linux/device.h>
#include <linux/fs.h>
+#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -100,8 +101,8 @@ static int mtd_open(struct inode *inode, struct file *file)
mtd = get_mtd_device(NULL, devnum);
- if (!mtd)
- return -ENODEV;
+ if (IS_ERR(mtd))
+ return PTR_ERR(mtd);
if (MTD_ABSENT == mtd->type) {
put_mtd_device(mtd);
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index f11f55f0241..60f237f91bb 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -193,14 +193,14 @@ int unregister_mtd_user (struct mtd_notifier *old)
* Given a number and NULL address, return the num'th entry in the device
* table, if any. Given an address and num == -1, search the device table
* for a device with that address and return if it's still present. Given
- * both, return the num'th driver only if its address matches. Return NULL
- * if not.
+ * both, return the num'th driver only if its address matches. Return
+ * error code if not.
*/
struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
{
struct mtd_info *ret = NULL;
- int i;
+ int i, err = -ENODEV;
mutex_lock(&mtd_table_mutex);
@@ -217,22 +217,24 @@ struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
if (!ret)
goto out_unlock;
- if (!try_module_get(ret->owner)) {
- ret = NULL;
+ if (!try_module_get(ret->owner))
goto out_unlock;
- }
- if (ret->get_device && ret->get_device(ret)) {
- module_put(ret->owner);
- ret = NULL;
- goto out_unlock;
+ if (ret->get_device) {
+ err = ret->get_device(ret);
+ if (err)
+ goto out_put;
}
ret->usecount++;
+ mutex_unlock(&mtd_table_mutex);
+ return ret;
+out_put:
+ module_put(ret->owner);
out_unlock:
mutex_unlock(&mtd_table_mutex);
- return ret;
+ return ERR_PTR(err);
}
/**
diff --git a/fs/jffs/jffs_fm.c b/fs/jffs/jffs_fm.c
index 29b68d939bd..6aab317f56e 100644
--- a/fs/jffs/jffs_fm.c
+++ b/fs/jffs/jffs_fm.c
@@ -17,6 +17,7 @@
*
*/
#include <linux/slab.h>
+#include <linux/err.h>
#include <linux/blkdev.h>
#include <linux/jffs.h>
#include "jffs_fm.h"
@@ -104,7 +105,7 @@ jffs_build_begin(struct jffs_control *c, int unit)
mtd = get_mtd_device(NULL, unit);
- if (!mtd) {
+ if (IS_ERR(mtd)) {
kfree(fmc);
DJM(no_jffs_fmcontrol--);
return NULL;
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index bc4b8106a49..590f60a897c 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/fs.h>
+#include <linux/err.h>
#include <linux/mount.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
@@ -184,9 +185,9 @@ static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
struct mtd_info *mtd;
mtd = get_mtd_device(NULL, mtdnr);
- if (!mtd) {
+ if (IS_ERR(mtd)) {
D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
- return -EINVAL;
+ return PTR_ERR(mtd);
}
return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
@@ -221,7 +222,7 @@ static int jffs2_get_sb(struct file_system_type *fs_type,
D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
mtd = get_mtd_device(NULL, mtdnr);
- if (mtd) {
+ if (!IS_ERR(mtd)) {
if (!strcmp(mtd->name, dev_name+4))
return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
put_mtd_device(mtd);