From b3c10489cb464b12a74dda65f826433f71f2c2e2 Mon Sep 17 00:00:00 2001 From: Brian King Date: Tue, 22 Jul 2008 08:31:41 -0500 Subject: [PATCH] [SCSI] ibmvfc: Target refcounting fixes Fix up some refcounting on the ibmvfc drivers internal target struct when accessed through some sysfs attributes. Signed-off-by: Brian King Signed-off-by: James Bottomley --- drivers/scsi/ibmvscsi/ibmvfc.c | 48 ++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 20 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index 8d393800f47e..1781cec97fba 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -854,39 +854,41 @@ static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost) } /** - * __ibmvfc_find_target - Find the specified scsi_target (no locking) + * __ibmvfc_get_target - Find the specified scsi_target (no locking) * @starget: scsi target struct * * Return value: * ibmvfc_target struct / NULL if not found **/ -static struct ibmvfc_target *__ibmvfc_find_target(struct scsi_target *starget) +static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) { struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct ibmvfc_host *vhost = shost_priv(shost); struct ibmvfc_target *tgt; list_for_each_entry(tgt, &vhost->targets, queue) - if (tgt->target_id == starget->id) + if (tgt->target_id == starget->id) { + kref_get(&tgt->kref); return tgt; + } return NULL; } /** - * ibmvfc_find_target - Find the specified scsi_target + * ibmvfc_get_target - Find the specified scsi_target * @starget: scsi target struct * * Return value: * ibmvfc_target struct / NULL if not found **/ -static struct ibmvfc_target *ibmvfc_find_target(struct scsi_target *starget) +static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) { struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct ibmvfc_target *tgt; unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); - tgt = __ibmvfc_find_target(starget); + tgt = __ibmvfc_get_target(starget); spin_unlock_irqrestore(shost->host_lock, flags); return tgt; } @@ -990,6 +992,17 @@ static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) rport->dev_loss_tmo = 1; } +/** + * ibmvfc_release_tgt - Free memory allocated for a target + * @kref: kref struct + * + **/ +static void ibmvfc_release_tgt(struct kref *kref) +{ + struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); + kfree(tgt); +} + /** * ibmvfc_get_starget_node_name - Get SCSI target's node name * @starget: scsi target struct @@ -999,8 +1012,10 @@ static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) **/ static void ibmvfc_get_starget_node_name(struct scsi_target *starget) { - struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); } /** @@ -1012,8 +1027,10 @@ static void ibmvfc_get_starget_node_name(struct scsi_target *starget) **/ static void ibmvfc_get_starget_port_name(struct scsi_target *starget) { - struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); } /** @@ -1025,8 +1042,10 @@ static void ibmvfc_get_starget_port_name(struct scsi_target *starget) **/ static void ibmvfc_get_starget_port_id(struct scsi_target *starget) { - struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); } /** @@ -2650,17 +2669,6 @@ static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, ibmvfc_init_tgt(tgt, job_step); } -/** - * ibmvfc_release_tgt - Free memory allocated for a target - * @kref: kref struct - * - **/ -static void ibmvfc_release_tgt(struct kref *kref) -{ - struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); - kfree(tgt); -} - /** * ibmvfc_tgt_prli_done - Completion handler for Process Login * @evt: ibmvfc event struct -- 2.20.1