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target: Fix se_cmd->state_list leak regression during WRITE failure

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This patch addresses a v3.11 specific regression where se_cmd->state_list
was being leaked during a fabric WRITE failure, when the fabric releases
an associated se_cmd descriptor before I/O submission occurs, and normal
fast path callbacks have a chance to call target_remove_from_state_list().

It was manifesting with Poison overwritten messages with iscsi-target
once an ImmediateData payload CRC32C failure occured.

This bug was originally introduced during v3.11-rc1 with the following
commit:

commit 0b66818ac6
Author: Nicholas Bellinger <nab@linux-iscsi.org>
Date:   Thu Jun 6 01:36:41 2013 -0700

    target: Drop unnecessary CMD_T_DEV_ACTIVE check from transport_lun_remove_cmd

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-08-31 15:12:01 -07:00
parent 28aaa95032
commit c130480b12
1 changed files with 11 additions and 0 deletions
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11
drivers/target/target_core_transport.c
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@ -2134,6 +2134,7 @@ static void transport_write_pending_qf(struct se_cmd *cmd)
int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
{
unsigned long flags;
int ret = 0;
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
@ -2144,6 +2145,16 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
} else {
if (wait_for_tasks)
transport_wait_for_tasks(cmd);
/*
* Handle WRITE failure case where transport_generic_new_cmd()
* has already added se_cmd to state_list, but fabric has
* failed command before I/O submission.
*/
if (cmd->state_active) {
spin_lock_irqsave(&cmd->t_state_lock, flags);
target_remove_from_state_list(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
if (cmd->se_lun)
transport_lun_remove_cmd(cmd);