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scsi: device_handler: alua: Revert "Move a scsi_device_put() call out of alua_check_vpd()"

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There is a bug in commit 0b25e17e90 ("scsi: alua: Move a
scsi_device_put() call out of alua_check_vpd()"): that patch may cause
alua_rtpg_queue() callers to call scsi_device_put() even if that function
should not be called. Revert that commit to prepare for a different
solution.

Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Wilck <mwilck@suse.com>
Cc: Sachin Sant <sachinp@linux.ibm.com>
Cc: Benjamin Block <bblock@linux.ibm.com>
Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Reported-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221117183626.2656196-2-bvanassche@acm.org
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
2022-11-17 10:36:25 -08:00
committed by Martin K. Petersen
parent e118df4923
commit a500c4cc06
1 changed files with 8 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/scsi/device_handler/scsi_dh_alua.c
+8 -15
View File
@@ -324,7 +324,6 @@ static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h,
struct alua_port_group *pg, *old_pg = NULL;
bool pg_updated = false;
unsigned long flags;
bool put_sdev;
group_id = scsi_vpd_tpg_id(sdev, &rel_port);
if (group_id < 0) {
@@ -374,14 +373,11 @@ static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h,
list_add_rcu(&h->node, &pg->dh_list);
spin_unlock_irqrestore(&pg->lock, flags);
put_sdev = alua_rtpg_queue(rcu_dereference_protected(h->pg,
alua_rtpg_queue(rcu_dereference_protected(h->pg,
lockdep_is_held(&h->pg_lock)),
sdev, NULL, true);
spin_unlock(&h->pg_lock);
if (put_sdev)
scsi_device_put(sdev);
if (old_pg)
kref_put(&old_pg->kref, release_port_group);
@@ -982,10 +978,9 @@ queue_rtpg:
* RTPG already has been scheduled.
*
* Returns true if and only if alua_rtpg_work() will be called asynchronously.
* That function is responsible for calling @qdata->fn(). If this function
* returns true, the caller is responsible for invoking scsi_device_put(@sdev).
* That function is responsible for calling @qdata->fn().
*/
static bool __must_check 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)
{
@@ -1024,6 +1019,8 @@ static bool __must_check alua_rtpg_queue(struct alua_port_group *pg,
else
kref_put(&pg->kref, release_port_group);
}
if (sdev)
scsi_device_put(sdev);
return true;
}
@@ -1130,12 +1127,10 @@ static int alua_activate(struct scsi_device *sdev,
rcu_read_unlock();
mutex_unlock(&h->init_mutex);
if (alua_rtpg_queue(pg, sdev, qdata, true)) {
scsi_device_put(sdev);
if (alua_rtpg_queue(pg, sdev, qdata, true))
fn = NULL;
} else {
else
err = SCSI_DH_DEV_OFFLINED;
}
kref_put(&pg->kref, release_port_group);
out:
if (fn)
@@ -1161,9 +1156,7 @@ static void alua_check(struct scsi_device *sdev, bool force)
return;
}
rcu_read_unlock();
if (alua_rtpg_queue(pg, sdev, NULL, force))
scsi_device_put(sdev);
alua_rtpg_queue(pg, sdev, NULL, force);
kref_put(&pg->kref, release_port_group);
}