From: Nicholas Bellinger Date: Wed, 15 May 2013 07:52:44 +0000 (-0700) Subject: target: Re-instate sess_wait_list for target_wait_for_sess_cmds X-Git-Tag: v3.9.5~11 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=befb0ab8d1a9f51fb1682aaec9f0ab0eb23228e8;p=thirdparty%2Fkernel%2Fstable.git target: Re-instate sess_wait_list for target_wait_for_sess_cmds commit 9b31a328e344e62e7cc98ae574edcb7b674719bb upstream. Switch back to pre commit 1c7b13fe652 list splicing logic for active I/O shutdown with tcm_qla2xxx + ib_srpt fabrics. The original commit was done under the incorrect assumption that it's safe to walk se_sess->sess_cmd_list unprotected in target_wait_for_sess_cmds() after sess->sess_tearing_down = 1 has been set by target_sess_cmd_list_set_waiting() during session shutdown. So instead of adding sess->sess_cmd_lock protection around sess->sess_cmd_list during target_wait_for_sess_cmds(), switch back to sess->sess_wait_list to allow wait_for_completion() + TFO->release_cmd() to occur without having to walk ->sess_cmd_list after the list_splice. Also add a check to exit if target_sess_cmd_list_set_waiting() has already been called, and add a WARN_ON to check for any fabric bug where new se_cmds are added to sess->sess_cmd_list after sess->sess_tearing_down = 1 has already been set. Signed-off-by: Nicholas Bellinger Cc: Joern Engel Cc: Roland Dreier Signed-off-by: Lingzhu Xiang Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 0d4627648b5ab..fc9a5a07b69fc 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -222,6 +222,7 @@ struct se_session *transport_init_session(void) INIT_LIST_HEAD(&se_sess->sess_list); INIT_LIST_HEAD(&se_sess->sess_acl_list); INIT_LIST_HEAD(&se_sess->sess_cmd_list); + INIT_LIST_HEAD(&se_sess->sess_wait_list); spin_lock_init(&se_sess->sess_cmd_lock); kref_init(&se_sess->sess_kref); @@ -2252,11 +2253,14 @@ void target_sess_cmd_list_set_waiting(struct se_session *se_sess) unsigned long flags; spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); - - WARN_ON(se_sess->sess_tearing_down); + if (se_sess->sess_tearing_down) { + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); + return; + } se_sess->sess_tearing_down = 1; + list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); - list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) + list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) se_cmd->cmd_wait_set = 1; spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); @@ -2273,9 +2277,10 @@ void target_wait_for_sess_cmds( { struct se_cmd *se_cmd, *tmp_cmd; bool rc = false; + unsigned long flags; list_for_each_entry_safe(se_cmd, tmp_cmd, - &se_sess->sess_cmd_list, se_cmd_list) { + &se_sess->sess_wait_list, se_cmd_list) { list_del(&se_cmd->se_cmd_list); pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" @@ -2303,6 +2308,11 @@ void target_wait_for_sess_cmds( se_cmd->se_tfo->release_cmd(se_cmd); } + + spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); + WARN_ON(!list_empty(&se_sess->sess_cmd_list)); + spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); + } EXPORT_SYMBOL(target_wait_for_sess_cmds); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index c4af592f7057e..f8640f314d3ea 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -544,6 +544,7 @@ struct se_session { struct list_head sess_list; struct list_head sess_acl_list; struct list_head sess_cmd_list; + struct list_head sess_wait_list; spinlock_t sess_cmd_lock; struct kref sess_kref; };