@@ -471,7 +471,7 @@ int ubiblock_remove(struct ubi_volume_info *vi, bool force)
}
/* Found a device, let's lock it so we can check if it's busy */
- mutex_lock(&dev->dev_mutex);
+ mutex_lock_nested(&dev->dev_mutex, SINGLE_DEPTH_NESTING);
if (dev->refcnt > 0 && !force) {
ret = -EBUSY;
goto out_unlock_dev;
@@ -27,6 +27,7 @@
#include <linux/log2.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
+#include <linux/of.h>
#include <linux/slab.h>
#include <linux/major.h>
#include "ubi.h"
@@ -1066,6 +1067,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
* ubi_detach_mtd_dev - detach an MTD device.
* @ubi_num: UBI device number to detach from
* @anyway: detach MTD even if device reference count is not zero
+ * @have_lock: called by MTD notifier holding mtd_table_mutex
*
* This function destroys an UBI device number @ubi_num and detaches the
* underlying MTD device. Returns zero in case of success and %-EBUSY if the
@@ -1075,7 +1077,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
* Note, the invocations of this function has to be serialized by the
* @ubi_devices_mutex.
*/
-int ubi_detach_mtd_dev(int ubi_num, int anyway)
+int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock)
{
struct ubi_device *ubi;
@@ -1131,7 +1136,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
vfree(ubi->peb_buf);
vfree(ubi->fm_buf);
ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index);
- put_mtd_device(ubi->mtd);
+ if (have_lock)
+ __put_mtd_device(ubi->mtd);
+ else
+ put_mtd_device(ubi->mtd);
+
put_device(&ubi->dev);
return 0;
}
@@ -1208,43 +1217,51 @@ static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
return mtd;
}
-static int __init ubi_init(void)
+static void ubi_notify_add(struct mtd_info *mtd)
{
- int err, i, k;
+ struct device_node *np = mtd_get_of_node(mtd);
+ int err;
- /* Ensure that EC and VID headers have correct size */
- BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
- BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
+ if (!of_device_is_compatible(np, "linux,ubi"))
+ return;
- if (mtd_devs > UBI_MAX_DEVICES) {
- pr_err("UBI error: too many MTD devices, maximum is %d\n",
- UBI_MAX_DEVICES);
- return -EINVAL;
- }
+ /*
+ * we are already holding &mtd_table_mutex, but still need
+ * to bump refcount
+ */
+ err = __get_mtd_device(mtd);
+ if (err)
+ return;
- /* Create base sysfs directory and sysfs files */
- err = class_register(&ubi_class);
+ /* called while holding mtd_table_mutex */
+ mutex_lock_nested(&ubi_devices_mutex, SINGLE_DEPTH_NESTING);
+ err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0, false);
+ mutex_unlock(&ubi_devices_mutex);
if (err < 0)
- return err;
+ __put_mtd_device(mtd);
+}
- err = misc_register(&ubi_ctrl_cdev);
- if (err) {
- pr_err("UBI error: cannot register device\n");
- goto out;
- }
+static void ubi_notify_remove(struct mtd_info *mtd)
+{
+ int i;
- ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
- sizeof(struct ubi_wl_entry),
- 0, 0, NULL);
- if (!ubi_wl_entry_slab) {
- err = -ENOMEM;
- goto out_dev_unreg;
- }
+ /* called while holding mtd_table_mutex */
+ mutex_lock_nested(&ubi_devices_mutex, SINGLE_DEPTH_NESTING);
+ for (i = 0; i < UBI_MAX_DEVICES; i++)
+ if (ubi_devices[i] &&
+ ubi_devices[i]->mtd->index == mtd->index)
+ ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1, true);
+ mutex_unlock(&ubi_devices_mutex);
+}
- err = ubi_debugfs_init();
- if (err)
- goto out_slab;
+static struct mtd_notifier ubi_mtd_notifier = {
+ .add = ubi_notify_add,
+ .remove = ubi_notify_remove,
+};
+static int __init ubi_init_attach(void)
+{
+ int err, i, k;
/* Attach MTD devices */
for (i = 0; i < mtd_devs; i++) {
@@ -1292,25 +1309,79 @@ static int __init ubi_init(void)
}
}
+ return 0;
+
+out_detach:
+ for (k = 0; k < i; k++)
+ if (ubi_devices[k]) {
+ mutex_lock(&ubi_devices_mutex);
+ ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1, false);
+ mutex_unlock(&ubi_devices_mutex);
+ }
+ return err;
+}
+#ifndef CONFIG_MTD_UBI_MODULE
+late_initcall(ubi_init_attach);
+#endif
+
+static int __init ubi_init(void)
+{
+ int err;
+
+ /* Ensure that EC and VID headers have correct size */
+ BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
+ BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
+
+ if (mtd_devs > UBI_MAX_DEVICES) {
+ pr_err("UBI error: too many MTD devices, maximum is %d\n",
+ UBI_MAX_DEVICES);
+ return -EINVAL;
+ }
+
+ /* Create base sysfs directory and sysfs files */
+ err = class_register(&ubi_class);
+ if (err < 0)
+ return err;
+
+ err = misc_register(&ubi_ctrl_cdev);
+ if (err) {
+ pr_err("UBI error: cannot register device\n");
+ goto out;
+ }
+
+ ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
+ sizeof(struct ubi_wl_entry),
+ 0, 0, NULL);
+ if (!ubi_wl_entry_slab) {
+ err = -ENOMEM;
+ goto out_dev_unreg;
+ }
+
+ err = ubi_debugfs_init();
+ if (err)
+ goto out_slab;
+
err = ubiblock_init();
if (err) {
pr_err("UBI error: block: cannot initialize, error %d\n", err);
/* See comment above re-ubi_is_module(). */
if (ubi_is_module())
- goto out_detach;
+ goto out_slab;
+ }
+
+ register_mtd_user(&ubi_mtd_notifier);
+
+ if (ubi_is_module()) {
+ err = ubi_init_attach();
+ if (err)
+ goto out_mtd_notifier;
}
return 0;
-out_detach:
- for (k = 0; k < i; k++)
- if (ubi_devices[k]) {
- mutex_lock(&ubi_devices_mutex);
- ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1);
- mutex_unlock(&ubi_devices_mutex);
- }
- ubi_debugfs_exit();
+out_mtd_notifier:
+ unregister_mtd_user(&ubi_mtd_notifier);
out_slab:
kmem_cache_destroy(ubi_wl_entry_slab);
out_dev_unreg:
@@ -1320,18 +1391,20 @@ static int __init ubi_init(void)
pr_err("UBI error: cannot initialize UBI, error %d\n", err);
return err;
}
-late_initcall(ubi_init);
+device_initcall(ubi_init);
+
static void __exit ubi_exit(void)
{
int i;
ubiblock_exit();
+ unregister_mtd_user(&ubi_mtd_notifier);
for (i = 0; i < UBI_MAX_DEVICES; i++)
if (ubi_devices[i]) {
mutex_lock(&ubi_devices_mutex);
- ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1);
+ ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1, false);
mutex_unlock(&ubi_devices_mutex);
}
ubi_debugfs_exit();
@@ -1065,7 +1065,7 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
}
mutex_lock(&ubi_devices_mutex);
- err = ubi_detach_mtd_dev(ubi_num, 0);
+ err = ubi_detach_mtd_dev(ubi_num, 0, false);
mutex_unlock(&ubi_devices_mutex);
break;
}
@@ -939,7 +939,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
int vid_hdr_offset, int max_beb_per1024,
bool disable_fm);
-int ubi_detach_mtd_dev(int ubi_num, int anyway);
+int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock);
struct ubi_device *ubi_get_device(int ubi_num);
void ubi_put_device(struct ubi_device *ubi);
struct ubi_device *ubi_get_by_major(int major);