btrfs: replace simple_strtoull() with kstrtoull()

use the newer and more pleasant kstrtoull() to replace simple_strtoull(),
because simple_strtoull() is marked for obsoletion.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a21a4ac537b7..fba7a004e7e5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1503,11 +1503,12 @@ static noinline int btrfs_ioctl_resize(struct file *file,
         sizestr = vol_args->name;
         devstr = strchr(sizestr, ':');
         if (devstr) {
-                char *end;
                 sizestr = devstr + 1;
                 *devstr = '\0';
                 devstr = vol_args->name;
-                devid = simple_strtoull(devstr, &end, 10);
+                ret = kstrtoull(devstr, 10, &devid);
+                if (ret)
+                        goto out_free;
                 if (!devid) {
                         ret = -EINVAL;
                         goto out_free;