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authorRoland Dreier <roland@purestorage.com>2015-09-08 06:14:18 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2015-09-11 00:32:28 -0700
commit7dd03aca9d61a9b64cd2a8cf6f5ea6f1f5391e8d (patch)
tree9dec30b18f9ec4626dd9c17bc99bb134726f80e4 /drivers/target/iscsi/iscsi_target_device.c
parent4416f89b8cfcb794d040fc3b68e5fb159b7d8d02 (diff)
target: Fix max_cmd_sn increment w/o cmdsn mutex regressions
Current for-next iscsi target is broken: commit 109e2381749c1cfd94a0d22b2b54142539024973 Author: Roland Dreier <roland@purestorage.com> Date: Thu Jul 23 14:53:32 2015 -0700 target: Drop iSCSI use of mutex around max_cmd_sn increment This patch fixes incorrect pr_debug() + atomic_inc_return() usage within iscsit_increment_maxcmdsn() code. Also fix funny iscsit_determine_maxcmdsn() usage and update iscsi_target_do_tx_login_io() code. Reported-by: Sagi Grimberg <sagig@mellanox.com> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/iscsi/iscsi_target_device.c')
-rw-r--r--drivers/target/iscsi/iscsi_target_device.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/target/iscsi/iscsi_target_device.c b/drivers/target/iscsi/iscsi_target_device.c
index 07d2ef67dba6..0382fa24b53b 100644
--- a/drivers/target/iscsi/iscsi_target_device.c
+++ b/drivers/target/iscsi/iscsi_target_device.c
@@ -47,16 +47,19 @@ void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
* core_set_queue_depth_for_node().
*/
sess->cmdsn_window = se_nacl->queue_depth;
- atomic_set(&sess->max_cmd_sn, (u32) atomic_read(&sess->max_cmd_sn) + se_nacl->queue_depth - 1);
+ atomic_add(se_nacl->queue_depth - 1, &sess->max_cmd_sn);
}
void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
{
+ u32 max_cmd_sn;
+
if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
return;
cmd->maxcmdsn_inc = 1;
- pr_debug("Updated MaxCmdSN to 0x%08x\n", atomic_inc_return(&sess->max_cmd_sn));
+ max_cmd_sn = atomic_inc_return(&sess->max_cmd_sn);
+ pr_debug("Updated MaxCmdSN to 0x%08x\n", max_cmd_sn);
}
EXPORT_SYMBOL(iscsit_increment_maxcmdsn);