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| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-15 20:10:37 +0400 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-21 00:03:43 +0400 |
| commit | 6071239ef1947914892601e36785c7b1cf8b7dd4 (patch) | |
| tree | e7e2a6718ab3e97590c670262a746f042157e756 /drivers/mtd/mtdchar.c | |
| parent | ea2959a2972410f15155a015df74ce77ac79f8b8 (diff) | |
| download | linux-6071239ef1947914892601e36785c7b1cf8b7dd4.tar.xz | |
mtdchar: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/mtd/mtdchar.c')
| -rw-r--r-- | drivers/mtd/mtdchar.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 5d3ac512ce16..129d429cd2da 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -14,6 +14,7 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/sched.h> +#include <linux/smp_lock.h> #include <linux/mtd/mtd.h> #include <linux/mtd/compatmac.h> @@ -86,6 +87,7 @@ static int mtd_open(struct inode *inode, struct file *file) { int minor = iminor(inode); int devnum = minor >> 1; + int ret = 0; struct mtd_info *mtd; struct mtd_file_info *mfi; @@ -98,31 +100,39 @@ static int mtd_open(struct inode *inode, struct file *file) if ((file->f_mode & 2) && (minor & 1)) return -EACCES; + lock_kernel(); mtd = get_mtd_device(NULL, devnum); - if (IS_ERR(mtd)) - return PTR_ERR(mtd); + if (IS_ERR(mtd)) { + ret = PTR_ERR(mtd); + goto out; + } if (MTD_ABSENT == mtd->type) { put_mtd_device(mtd); - return -ENODEV; + ret = -ENODEV; + goto out; } /* You can't open it RW if it's not a writeable device */ if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { put_mtd_device(mtd); - return -EACCES; + ret = -EACCES; + goto out; } mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); if (!mfi) { put_mtd_device(mtd); - return -ENOMEM; + ret = -ENOMEM; + goto out; } mfi->mtd = mtd; file->private_data = mfi; - return 0; +out: + unlock_kernel(); + return ret; } /* mtd_open */ /*====================================================================*/ |