UBI: cleanup ioctl handling

- don't do access_ok + get/put user but use the proper macro
- remove useless checks

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 5fc9fd4..fb238d7 100644 (file)
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -414,19 +414,7 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
        struct ubi_device *ubi = vol->ubi;
        void __user *argp = (void __user *)arg;
 
-       if (_IOC_NR(cmd) > VOL_CDEV_IOC_MAX_SEQ ||
-           _IOC_TYPE(cmd) != UBI_VOL_IOC_MAGIC)
-               return -ENOTTY;
-
-       if (_IOC_DIR(cmd) && _IOC_READ)
-               err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd));
-       else if (_IOC_DIR(cmd) && _IOC_WRITE)
-               err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd));
-       if (err)
-               return -EFAULT;
-
        switch (cmd) {
-
        /* Volume update command */
        case UBI_IOCVOLUP:
        {
@@ -472,7 +460,7 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
        {
                int32_t lnum;
 
-               err = __get_user(lnum, (__user int32_t *)argp);
+               err = get_user(lnum, (__user int32_t *)argp);
                if (err) {
                        err = -EFAULT;
                        break;
@@ -588,17 +576,6 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
        struct ubi_volume_desc *desc;
        void __user *argp = (void __user *)arg;
 
-       if (_IOC_NR(cmd) > UBI_CDEV_IOC_MAX_SEQ ||
-           _IOC_TYPE(cmd) != UBI_IOC_MAGIC)
-               return -ENOTTY;
-
-       if (_IOC_DIR(cmd) && _IOC_READ)
-               err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd));
-       else if (_IOC_DIR(cmd) && _IOC_WRITE)
-               err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd));
-       if (err)
-               return -EFAULT;
-
        if (!capable(CAP_SYS_RESOURCE))
                return -EPERM;
 
@@ -613,7 +590,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
                struct ubi_mkvol_req req;
 
                dbg_msg("create volume");
-               err = __copy_from_user(&req, argp,
+               err = copy_from_user(&req, argp,
                                       sizeof(struct ubi_mkvol_req));
                if (err) {
                        err = -EFAULT;
@@ -630,7 +607,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
                if (err)
                        break;
 
-               err = __put_user(req.vol_id, (__user int32_t *)argp);
+               err = put_user(req.vol_id, (__user int32_t *)argp);
                if (err)
                        err = -EFAULT;
 
@@ -643,7 +620,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
                int vol_id;
 
                dbg_msg("remove volume");
-               err = __get_user(vol_id, (__user int32_t *)argp);
+               err = get_user(vol_id, (__user int32_t *)argp);
                if (err) {
                        err = -EFAULT;
                        break;
@@ -670,7 +647,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
                struct ubi_rsvol_req req;
 
                dbg_msg("re-size volume");
-               err = __copy_from_user(&req, argp,
+               err = copy_from_user(&req, argp,
                                       sizeof(struct ubi_rsvol_req));
                if (err) {
                        err = -EFAULT;