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| author | Roland Dreier <roland@purestorage.com> | 2011-09-28 22:12:07 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-10-24 03:17:51 +0000 |
| commit | 79a7fef26431830e22e282053d050af790117db8 (patch) | |
| tree | 85919eb3addb0b488f9d5361a375c961e5e311a3 /drivers/target/target_core_tmr.c | |
| parent | 9375b1bfd2555c8bc828d394a4419a212b46ba71 (diff) | |
| download | linux-79a7fef26431830e22e282053d050af790117db8.tar.gz linux-79a7fef26431830e22e282053d050af790117db8.tar.xz linux-79a7fef26431830e22e282053d050af790117db8.zip | |
target: Prevent cmd->se_queue_node double add
This patch addresses a bug with the lio-core-2.6.git conversion of
transport_add_cmd_to_queue() to use a single embedded list_head, instead
of individual struct se_queue_req allocations allowing a single se_cmd to
be added to the queue mulitple times. This was changed in the following:
commit 2a9e4d5ca5d99f4c600578d6285d45142e7e5208
Author: Andy Grover <agrover@redhat.com>
Date: Tue Apr 26 17:45:51 2011 -0700
target: Embed qr in struct se_cmd
The problem is that some target code still assumes performing multiple
adds is allowed via transport_add_cmd_to_queue(), which ends up causing
list corruption in qobj->qobj_list code. This patch addresses this
by removing an existing struct se_cmd from the list before the add, and
removes an unnecessary list walk in transport_remove_cmd_from_queue()
It also changes cmd->t_transport_queue_active to use explict sets intead
of increment/decrement to prevent confusion during exception path handling.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
Diffstat (limited to 'drivers/target/target_core_tmr.c')
| -rw-r--r-- | drivers/target/target_core_tmr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c index 662473c54043..98b12a8923f0 100644 --- a/drivers/target/target_core_tmr.c +++ b/drivers/target/target_core_tmr.c @@ -339,7 +339,7 @@ int core_tmr_lun_reset( atomic_dec(&cmd->t_transport_queue_active); atomic_dec(&qobj->queue_cnt); - list_del(&cmd->se_queue_node); + list_del_init(&cmd->se_queue_node); spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" |