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UBI: tweak volumes locking some more 

Make the code more consistent by requiring the caller to lock the
ubi->volume_mutex, because this is what we do for updates.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-12-17 17:08:55 +02:00
parent d05c77a816
commit 40e4d0c166
2 changed files with 17 additions and 16 deletions
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13
drivers/mtd/ubi/cdev.c
View File

@ -605,7 +605,9 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
req.name[req.name_len] = '\0';
mutex_lock(&ubi->volumes_mutex);
err = ubi_create_volume(ubi, &req);
mutex_unlock(&ubi->volumes_mutex);
if (err)
break;
@ -634,11 +636,14 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
mutex_lock(&ubi->volumes_mutex);
err = ubi_remove_volume(desc);
mutex_unlock(&ubi->volumes_mutex);
/*
* The volume is deleted, and the 'struct ubi_volume' object
* will be freed when 'ubi_close_volume()' will call
* 'put_device()'.
* The volume is deleted (unless an error occurred), and the
* 'struct ubi_volume' object will be freed when
* 'ubi_close_volume()' will call 'put_device()'.
*/
ubi_close_volume(desc);
break;
@ -673,7 +678,9 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
pebs = !!do_div(tmp, desc->vol->usable_leb_size);
pebs += tmp;
mutex_lock(&ubi->volumes_mutex);
err = ubi_resize_volume(desc, pebs);
mutex_unlock(&ubi->volumes_mutex);
ubi_close_volume(desc);
break;
}

20
drivers/mtd/ubi/vmt.c
View File

@ -189,7 +189,8 @@ static void volume_sysfs_close(struct ubi_volume *vol)
* This function creates volume described by @req. If @req->vol_id id
* %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
* and saves it in @req->vol_id. Returns zero in case of success and a negative
* error code in case of failure.
* error code in case of failure. Note, the caller has to have the
* @ubi->volumes_mutex locked.
*/
int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
{
@ -206,7 +207,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
if (!vol)
return -ENOMEM;
mutex_lock(&ubi->volumes_mutex);
spin_lock(&ubi->volumes_lock);
if (vol_id == UBI_VOL_NUM_AUTO) {
/* Find unused volume ID */
@ -356,7 +356,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
spin_unlock(&ubi->volumes_lock);
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
return 0;
out_sysfs:
@ -383,7 +382,6 @@ out_acc:
ubi->avail_pebs += vol->reserved_pebs;
out_unlock:
spin_unlock(&ubi->volumes_lock);
mutex_unlock(&ubi->volumes_mutex);
if (dont_free)
put_device(&vol->dev);
else
@ -398,7 +396,8 @@ out_unlock:
*
* This function removes volume described by @desc. The volume has to be opened
* in "exclusive" mode. Returns zero in case of success and a negative error
* code in case of failure.
* code in case of failure. The caller has to have the @ubi->volumes_mutex
* locked.
*/
int ubi_remove_volume(struct ubi_volume_desc *desc)
{
@ -413,7 +412,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
if (ubi->ro_mode)
return -EROFS;
mutex_lock(&ubi->volumes_mutex);
spin_lock(&ubi->volumes_lock);
if (vol->ref_count > 1) {
/*
@ -461,7 +459,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
spin_unlock(&ubi->volumes_lock);
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
return 0;
out_err:
@ -470,7 +467,6 @@ out_err:
ubi->volumes[vol_id] = vol;
out_unlock:
spin_unlock(&ubi->volumes_lock);
mutex_unlock(&ubi->volumes_mutex);
return err;
}
@ -479,8 +475,9 @@ out_unlock:
* @desc: volume descriptor
* @reserved_pebs: new size in physical eraseblocks
*
* This function returns zero in case of success, and a negative error code in
* case of failure.
* This function re-sizes the volume and returns zero in case of success, and a
* negative error code in case of failure. The caller has to have the
* @ubi->volumes_mutex locked.
*/
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
{
@ -516,7 +513,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
for (i = 0; i < reserved_pebs; i++)
new_mapping[i] = UBI_LEB_UNMAPPED;
mutex_lock(&ubi->volumes_mutex);
spin_lock(&ubi->volumes_lock);
if (vol->ref_count > 1) {
spin_unlock(&ubi->volumes_lock);
@ -587,7 +583,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
}
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
return 0;
out_acc:
@ -599,7 +594,6 @@ out_acc:
}
out_free:
kfree(new_mapping);
mutex_unlock(&ubi->volumes_mutex);
return err;
}