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>

2 files changed, 10 insertions, 11 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);
diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
index 1cb3d345183f..ec9e40dc4514 100644
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -223,7 +223,7 @@ static struct se_node_acl *ft_add_acl(
                 return ERR_PTR(-EINVAL);
 
         acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
-        if (!(acl))
+        if (!acl)
                 return ERR_PTR(-ENOMEM);
         acl->node_auth.port_name = wwpn;
 
@@ -280,7 +280,7 @@ struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
         struct ft_node_acl *acl;
 
         acl = kzalloc(sizeof(*acl), GFP_KERNEL);
-        if (!(acl)) {
+        if (!acl) {
                 printk(KERN_ERR "Unable to allocate struct ft_node_acl\n");
                 return NULL;
         }