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Date: Thu, 13 Dec 2012 11:56:47 -0200
From: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Roland Dreier <roland@...estorage.com>,
Andy Grover <agrover@...hat.com>,
Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
Nicholas Bellinger <nab@...ux-iscsi.org>,
Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 042/241] iscsi-target: Fix missed wakeup race in TX thread
3.5.7.2 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Roland Dreier <roland@...estorage.com>
commit d5627acba9ae584cf4928af19f7ddf5f6837de32 upstream.
The sleeping code in iscsi_target_tx_thread() is susceptible to the classic
missed wakeup race:
- TX thread finishes handle_immediate_queue() and handle_response_queue(),
thinks both queues are empty.
- Another thread adds a queue entry and does wake_up_process(), which does
nothing because the TX thread is still awake.
- TX thread does schedule_timeout() and sleeps forever.
In practice this can kill an iSCSI connection if for example an initiator
does single-threaded writes and the target misses the wakeup window when
queueing an R2T; in this case the connection will be stuck until the
initiator loses patience and does some task management operation (or kills
the connection entirely).
Fix this by converting to wait_event_interruptible(), which does not
suffer from this sort of race.
Signed-off-by: Roland Dreier <roland@...estorage.com>
Cc: Andy Grover <agrover@...hat.com>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
drivers/target/iscsi/iscsi_target.c | 4 +++-
drivers/target/iscsi/iscsi_target_core.h | 1 +
drivers/target/iscsi/iscsi_target_login.c | 1 +
drivers/target/iscsi/iscsi_target_util.c | 22 ++++++++++++++++++++--
drivers/target/iscsi/iscsi_target_util.h | 1 +
5 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 6d1d906..4891cc8 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -3733,7 +3733,9 @@ restart:
*/
iscsit_thread_check_cpumask(conn, current, 1);
- schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
+ wait_event_interruptible(conn->queues_wq,
+ !iscsit_conn_all_queues_empty(conn) ||
+ ts->status == ISCSI_THREAD_SET_RESET);
if ((ts->status == ISCSI_THREAD_SET_RESET) ||
signal_pending(current))
diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index 8bb81d68..d76a711 100644
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -485,6 +485,7 @@ struct iscsi_tmr_req {
};
struct iscsi_conn {
+ wait_queue_head_t queues_wq;
/* Authentication Successful for this connection */
u8 auth_complete;
/* State connection is currently in */
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index ae30424..3cb7a4f 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -45,6 +45,7 @@ extern spinlock_t sess_idr_lock;
static int iscsi_login_init_conn(struct iscsi_conn *conn)
{
+ init_waitqueue_head(&conn->queues_wq);
INIT_LIST_HEAD(&conn->conn_list);
INIT_LIST_HEAD(&conn->conn_cmd_list);
INIT_LIST_HEAD(&conn->immed_queue_list);
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index b42cdeb..552f45a 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -488,7 +488,7 @@ void iscsit_add_cmd_to_immediate_queue(
atomic_set(&conn->check_immediate_queue, 1);
spin_unlock_bh(&conn->immed_queue_lock);
- wake_up_process(conn->thread_set->tx_thread);
+ wake_up(&conn->queues_wq);
}
struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
@@ -562,7 +562,7 @@ void iscsit_add_cmd_to_response_queue(
atomic_inc(&cmd->response_queue_count);
spin_unlock_bh(&conn->response_queue_lock);
- wake_up_process(conn->thread_set->tx_thread);
+ wake_up(&conn->queues_wq);
}
struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
@@ -616,6 +616,24 @@ static void iscsit_remove_cmd_from_response_queue(
}
}
+bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
+{
+ bool empty;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ empty = list_empty(&conn->immed_queue_list);
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ if (!empty)
+ return empty;
+
+ spin_lock_bh(&conn->response_queue_lock);
+ empty = list_empty(&conn->response_queue_list);
+ spin_unlock_bh(&conn->response_queue_lock);
+
+ return empty;
+}
+
void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
{
struct iscsi_queue_req *qr, *qr_tmp;
diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h
index e1c729b..2ff9bbc 100644
--- a/drivers/target/iscsi/iscsi_target_util.h
+++ b/drivers/target/iscsi/iscsi_target_util.h
@@ -25,6 +25,7 @@ extern struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_
extern void iscsit_add_cmd_to_response_queue(struct iscsi_cmd *, struct iscsi_conn *, u8);
extern struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *);
extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_conn *);
+extern bool iscsit_conn_all_queues_empty(struct iscsi_conn *);
extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *);
extern void iscsit_release_cmd(struct iscsi_cmd *);
extern void iscsit_free_cmd(struct iscsi_cmd *);
--
1.7.9.5
--
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