diff options
| -rw-r--r-- | drivers/mtd/ubi/build.c | 63 |
1 files changed, 30 insertions, 33 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index 99ff57d3ac6..bc45ef9af17 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -365,11 +365,13 @@ static void dev_release(struct device *dev) /** * ubi_sysfs_init - initialize sysfs for an UBI device. * @ubi: UBI device description object + * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was + * taken * * This function returns zero in case of success and a negative error code in * case of failure. */ -static int ubi_sysfs_init(struct ubi_device *ubi) +static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) { int err; @@ -381,6 +383,7 @@ static int ubi_sysfs_init(struct ubi_device *ubi) if (err) return err; + *ref = 1; err = device_create_file(&ubi->dev, &dev_eraseblock_size); if (err) return err; @@ -436,7 +439,7 @@ static void ubi_sysfs_close(struct ubi_device *ubi) } /** - * kill_volumes - destroy all volumes. + * kill_volumes - destroy all user volumes. * @ubi: UBI device description object */ static void kill_volumes(struct ubi_device *ubi) @@ -449,36 +452,29 @@ static void kill_volumes(struct ubi_device *ubi) } /** - * free_user_volumes - free all user volumes. - * @ubi: UBI device description object - * - * Normally the volumes are freed at the release function of the volume device - * objects. However, on error paths the volumes have to be freed before the - * device objects have been initialized. - */ -static void free_user_volumes(struct ubi_device *ubi) -{ - int i; - - for (i = 0; i < ubi->vtbl_slots; i++) - if (ubi->volumes[i]) { - kfree(ubi->volumes[i]->eba_tbl); - kfree(ubi->volumes[i]); - } -} - -/** * uif_init - initialize user interfaces for an UBI device. * @ubi: UBI device description object + * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was + * taken, otherwise set to %0 + * + * This function initializes various user interfaces for an UBI device. If the + * initialization fails at an early stage, this function frees all the + * resources it allocated, returns an error, and @ref is set to %0. However, + * if the initialization fails after the UBI device was registered in the + * driver core subsystem, this function takes a reference to @ubi->dev, because + * otherwise the release function ('dev_release()') would free whole @ubi + * object. The @ref argument is set to %1 in this case. The caller has to put + * this reference. * * This function returns zero in case of success and a negative error code in - * case of failure. Note, this function destroys all volumes if it fails. + * case of failure. */ -static int uif_init(struct ubi_device *ubi) +static int uif_init(struct ubi_device *ubi, int *ref) { int i, err; dev_t dev; + *ref = 0; sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); /* @@ -506,7 +502,7 @@ static int uif_init(struct ubi_device *ubi) goto out_unreg; } - err = ubi_sysfs_init(ubi); + err = ubi_sysfs_init(ubi, ref); if (err) goto out_sysfs; @@ -524,6 +520,8 @@ static int uif_init(struct ubi_device *ubi) out_volumes: kill_volumes(ubi); out_sysfs: + if (*ref) + get_device(&ubi->dev); ubi_sysfs_close(ubi); cdev_del(&ubi->cdev); out_unreg: @@ -877,7 +875,7 @@ static int ubi_reboot_notifier(struct notifier_block *n, unsigned long state, int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset) { struct ubi_device *ubi; - int i, err, do_free = 1; + int i, err, ref = 0; /* * Check if we already have the same MTD device attached. @@ -977,9 +975,9 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset) goto out_detach; } - err = uif_init(ubi); + err = uif_init(ubi, &ref); if (err) - goto out_nofree; + goto out_detach; ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name); if (IS_ERR(ubi->bgt_thread)) { @@ -1027,12 +1025,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset) out_uif: uif_close(ubi); -out_nofree: - do_free = 0; out_detach: ubi_wl_close(ubi); - if (do_free) - free_user_volumes(ubi); free_internal_volumes(ubi); vfree(ubi->vtbl); out_free: @@ -1041,7 +1035,10 @@ out_free: #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID vfree(ubi->dbg_peb_buf); #endif - kfree(ubi); + if (ref) + put_device(&ubi->dev); + else + kfree(ubi); return err; } @@ -1098,7 +1095,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway) /* * Get a reference to the device in order to prevent 'dev_release()' - * from freeing @ubi object. + * from freeing the @ubi object. */ get_device(&ubi->dev); |