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mtd: switch open_mtd_by_chdev() to use of vfs_stat()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-03-24 14:43:24 -04:00
parent f55532a0c0
commit 87f15d4add
1 changed files with 5 additions and 8 deletions
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13
drivers/mtd/ubi/build.c
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@ -1142,22 +1142,19 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
*/ */
static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev)
{ {
int err, major, minor, mode; struct kstat stat;
struct path path; int err, minor;
/* Probably this is an MTD character device node path */ /* Probably this is an MTD character device node path */
err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); err = vfs_stat(mtd_dev, &stat);
if (err) if (err)
return ERR_PTR(err); return ERR_PTR(err);
/* MTD device number is defined by the major / minor numbers */ /* MTD device number is defined by the major / minor numbers */
major = imajor(d_backing_inode(path.dentry)); if (MAJOR(stat.rdev) != MTD_CHAR_MAJOR || !S_ISCHR(stat.mode))
minor = iminor(d_backing_inode(path.dentry));
mode = d_backing_inode(path.dentry)->i_mode;
path_put(&path);
if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode))
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
minor = MINOR(stat.rdev);
if (minor & 1) if (minor & 1)
/* /*
* Just do not think the "/dev/mtdrX" devices support is need, * Just do not think the "/dev/mtdrX" devices support is need,