fs/partition/check.c: fix return value warning

fs/partitions/check.c:381: warning: ignoring return value of ___device_add___,
  declared with attribute warn_unused_result

[akpm@linux-foundation.org: multiple-return-statements-per-function are evil]
Signed-off-by: Abdel Benamrouche <draconux@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 23 insertions, 7 deletions

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index efef715135d3..2e6413fbd2d8 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -344,18 +344,18 @@ static ssize_t whole_disk_show(struct device *dev,
 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
                    whole_disk_show, NULL);
 
-void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
+int add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
 {
         struct hd_struct *p;
         int err;
 
         p = kzalloc(sizeof(*p), GFP_KERNEL);
         if (!p)
-                return;
+                return -ENOMEM;
 
         if (!init_part_stats(p)) {
-                kfree(p);
-                return;
+                err = -ENOMEM;
+                goto out0;
         }
         p->start_sect = start;
         p->nr_sects = len;
@@ -378,15 +378,31 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
 
         /* delay uevent until 'holders' subdir is created */
         p->dev.uevent_suppress = 1;
-        device_add(&p->dev);
+        err = device_add(&p->dev);
+        if (err)
+                goto out1;
         partition_sysfs_add_subdir(p);
         p->dev.uevent_suppress = 0;
-        if (flags & ADDPART_FLAG_WHOLEDISK)
+        if (flags & ADDPART_FLAG_WHOLEDISK) {
                 err = device_create_file(&p->dev, &dev_attr_whole_disk);
+                if (err)
+                        goto out2;
+        }
 
         /* suppress uevent if the disk supresses it */
         if (!disk->dev.uevent_suppress)
                 kobject_uevent(&p->dev.kobj, KOBJ_ADD);
+
+        return 0;
+
+out2:
+        device_del(&p->dev);
+out1:
+        put_device(&p->dev);
+        free_part_stats(p);
+out0:
+        kfree(p);
+        return err;
 }
 
 /* Not exported, helper to add_disk(). */
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index e8787417f65a..118216f1bd3c 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -541,7 +541,7 @@ extern dev_t blk_lookup_devt(const char *name, int part);
 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 
 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
-extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
+extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
 extern void delete_partition(struct gendisk *, int);
 extern void printk_all_partitions(void);