[PATCH 2/3] scsi_dh_alua: Ensure that alua_activate() calls the completion function

[Bart Van Assche]

Callers of scsi_dh_activate(), e.g. dm-mpath, assume that this
function either returns an error code or calls the completion
function. Make alua_activate() call the completion function even
if scsi_device_get() fails.

Signed-off-by: Bart Van Assche <bart.vanass...@sandisk.com>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Tang Junhui <tang.jun...@zte.com.cn>
Cc: <sta...@vger.kernel.org>
---
 drivers/scsi/device_handler/scsi_dh_alua.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c 
b/drivers/scsi/device_handler/scsi_dh_alua.c
index e0b15f3dd303..b6849d3ecefe 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -113,7 +113,7 @@ struct alua_queue_data {
 #define ALUA_POLICY_SWITCH_ALL         1
 
 static void alua_rtpg_work(struct work_struct *work);
-static void alua_rtpg_queue(struct alua_port_group *pg,
+static bool alua_rtpg_queue(struct alua_port_group *pg,
                            struct scsi_device *sdev,
                            struct alua_queue_data *qdata, bool force);
 static void alua_check(struct scsi_device *sdev, bool force);
@@ -862,7 +862,13 @@ static void alua_rtpg_work(struct work_struct *work)
        kref_put(&pg->kref, release_port_group);
 }
 
-static void alua_rtpg_queue(struct alua_port_group *pg,
+/**
+ * alua_rtpg_queue() - cause RTPG to be submitted asynchronously
+ *
+ * Returns true if and only if alua_rtpg_work() will be called asynchronously.
+ * That function is responsible for calling @qdata->fn().
+ */
+static bool alua_rtpg_queue(struct alua_port_group *pg,
                            struct scsi_device *sdev,
                            struct alua_queue_data *qdata, bool force)
 {
@@ -871,7 +877,7 @@ static void alua_rtpg_queue(struct alua_port_group *pg,
        struct workqueue_struct *alua_wq = kaluad_wq;
 
        if (!pg || scsi_device_get(sdev))
-               return;
+               return false;
 
        spin_lock_irqsave(&pg->lock, flags);
        if (qdata) {
@@ -907,6 +913,8 @@ static void alua_rtpg_queue(struct alua_port_group *pg,
        }
        if (sdev)
                scsi_device_put(sdev);
+
+       return true;
 }
 
 /*
@@ -1007,11 +1015,13 @@ static int alua_activate(struct scsi_device *sdev,
                mutex_unlock(&h->init_mutex);
                goto out;
        }
-       fn = NULL;
        rcu_read_unlock();
        mutex_unlock(&h->init_mutex);
 
-       alua_rtpg_queue(pg, sdev, qdata, true);
+       if (alua_rtpg_queue(pg, sdev, qdata, true))
+               fn = NULL;
+       else
+               err = SCSI_DH_DEV_OFFLINED;
        kref_put(&pg->kref, release_port_group);
 out:
        if (fn)
-- 
2.12.0