Merge tag 'dm-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Pull device-mapper fixes from Alasdair G Kergon:
"Fix a couple of serious memory leaks in device-mapper thin
provisioning and tidy its MODULE_DESCRIPTION.
Mitigate occasional reported hangs associated with multipath scsi_dh
module loading."
* tag 'dm-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
dm mpath: check if scsi_dh module already loaded before trying to load
dm thin: correct module description
dm thin: fix unprotected use of prepared_discards list
dm thin: reinstate missing mempool_free in cell_release_singleton
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 922a338..754f38f 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -718,8 +718,8 @@
return 0;
m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
- request_module("scsi_dh_%s", m->hw_handler_name);
- if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
+ if (!try_then_request_module(scsi_dh_handler_exist(m->hw_handler_name),
+ "scsi_dh_%s", m->hw_handler_name)) {
ti->error = "unknown hardware handler type";
ret = -EINVAL;
goto fail;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 213ae32..2fd87b5 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -279,8 +279,10 @@
hlist_del(&cell->list);
- bio_list_add(inmates, cell->holder);
- bio_list_merge(inmates, &cell->bios);
+ if (inmates) {
+ bio_list_add(inmates, cell->holder);
+ bio_list_merge(inmates, &cell->bios);
+ }
mempool_free(cell, prison->cell_pool);
}
@@ -303,9 +305,10 @@
*/
static void __cell_release_singleton(struct cell *cell, struct bio *bio)
{
- hlist_del(&cell->list);
BUG_ON(cell->holder != bio);
BUG_ON(!bio_list_empty(&cell->bios));
+
+ __cell_release(cell, NULL);
}
static void cell_release_singleton(struct cell *cell, struct bio *bio)
@@ -1177,6 +1180,7 @@
static void process_discard(struct thin_c *tc, struct bio *bio)
{
int r;
+ unsigned long flags;
struct pool *pool = tc->pool;
struct cell *cell, *cell2;
struct cell_key key, key2;
@@ -1218,7 +1222,9 @@
m->bio = bio;
if (!ds_add_work(&pool->all_io_ds, &m->list)) {
+ spin_lock_irqsave(&pool->lock, flags);
list_add(&m->list, &pool->prepared_discards);
+ spin_unlock_irqrestore(&pool->lock, flags);
wake_worker(pool);
}
} else {
@@ -2626,8 +2632,10 @@
if (h->all_io_entry) {
INIT_LIST_HEAD(&work);
ds_dec(h->all_io_entry, &work);
+ spin_lock_irqsave(&pool->lock, flags);
list_for_each_entry_safe(m, tmp, &work, list)
list_add(&m->list, &pool->prepared_discards);
+ spin_unlock_irqrestore(&pool->lock, flags);
}
mempool_free(h, pool->endio_hook_pool);
@@ -2759,6 +2767,6 @@
module_init(dm_thin_init);
module_exit(dm_thin_exit);
-MODULE_DESCRIPTION(DM_NAME "device-mapper thin provisioning target");
+MODULE_DESCRIPTION(DM_NAME " thin provisioning target");
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");