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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-12-17 17:08:55 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-12-26 19:15:16 +0200
commit40e4d0c1660f8ee01ea4ed570297b32c35c70aa3 (patch)
treed1fbdf8b790ebc002302259e9f0d507d5a508855 /drivers/mtd/ubi
parentd05c77a816974c09f8c7e8f48e5b9f7b59dafdf3 (diff)
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>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/cdev.c13
-rw-r--r--drivers/mtd/ubi/vmt.c20
2 files changed, 17 insertions, 16 deletions
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 35d34b675c7..22c15a388f2 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -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;
}
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 18ef1e1da49..3ed63dc3738 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -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;
}