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authorNicholas Bellinger <nab@linux-iscsi.org>2011-05-27 13:58:48 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2011-07-22 09:37:47 +0000
commit2be18149d9d7ebfde7c3081d60f7c9d8d3b6f8c7 (patch)
tree2d6d602112049f4e6188d8ee3412168760e302ae /drivers/target/tcm_fc/tfc_cmd.c
parenta1fa3759583ef2379da6e2cc346ee9f99dfba309 (diff)
tcm_fc: Convert to wake_up_process and schedule_timeout_interruptible
This patch converts ft_queue_cmd() to use wake_up_process() and ft_thread() to use schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT) instead of wait_event_interruptible(). This fixes a potential race with the wait_event_interruptible() conditional with qobj->queue_cnt in ft_thread(). This patch also drops the unnecessary set_user_nice(current, -20) in ft_thread(), and drops extra () around two if (!(acl)) conditionals in tfc_conf.c. Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/tcm_fc/tfc_cmd.c')
-rw-r--r--drivers/target/tcm_fc/tfc_cmd.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 74d5bb766201..a00951c80324 100644
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -94,15 +94,17 @@ void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
static void ft_queue_cmd(struct ft_sess *sess, struct ft_cmd *cmd)
{
- struct se_queue_obj *qobj;
+ struct ft_tpg *tpg = sess->tport->tpg;
+ struct se_queue_obj *qobj = &tpg->qobj;
unsigned long flags;
qobj = &sess->tport->tpg->qobj;
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
list_add_tail(&cmd->se_req.qr_list, &qobj->qobj_list);
- spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
atomic_inc(&qobj->queue_cnt);
- wake_up_interruptible(&qobj->thread_wq);
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+ wake_up_process(tpg->thread);
}
static struct ft_cmd *ft_dequeue_cmd(struct se_queue_obj *qobj)
@@ -688,15 +690,12 @@ int ft_thread(void *arg)
struct ft_tpg *tpg = arg;
struct se_queue_obj *qobj = &tpg->qobj;
struct ft_cmd *cmd;
- int ret;
-
- set_user_nice(current, -20);
while (!kthread_should_stop()) {
- ret = wait_event_interruptible(qobj->thread_wq,
- atomic_read(&qobj->queue_cnt) || kthread_should_stop());
- if (ret < 0 || kthread_should_stop())
+ schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
+ if (kthread_should_stop())
goto out;
+
cmd = ft_dequeue_cmd(qobj);
if (cmd)
ft_exec_req(cmd);