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scsi: scsi_dh_alua: Fix RCU annotations

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This patch avoids that sparse complains about RCU pointer dereferences.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: tang.junhui <tang.junhui@zte.com.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2016-12-01 11:30:50 -08:00 committed by Martin K. Petersen
parent 609a70df07
commit d29425b065
1 changed files with 9 additions and 7 deletions
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16
drivers/scsi/device_handler/scsi_dh_alua.c
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@ -95,7 +95,7 @@ struct alua_port_group {
struct alua_dh_data {
struct list_head node;
struct alua_port_group *pg;
struct alua_port_group __rcu *pg;
int group_id;
spinlock_t pg_lock;
struct scsi_device *sdev;
@ -369,7 +369,7 @@ static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h,
/* Check for existing port group references */
spin_lock(&h->pg_lock);
old_pg = h->pg;
old_pg = rcu_dereference_protected(h->pg, lockdep_is_held(&h->pg_lock));
if (old_pg != pg) {
/* port group has changed. Update to new port group */
if (h->pg) {
@ -388,7 +388,9 @@ 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);
alua_rtpg_queue(h->pg, sdev, NULL, true);
alua_rtpg_queue(rcu_dereference_protected(h->pg,
lockdep_is_held(&h->pg_lock)),
sdev, NULL, true);
spin_unlock(&h->pg_lock);
if (old_pg)
@ -937,7 +939,7 @@ static int alua_initialize(struct scsi_device *sdev, struct alua_dh_data *h)
static int alua_set_params(struct scsi_device *sdev, const char *params)
{
struct alua_dh_data *h = sdev->handler_data;
struct alua_port_group __rcu *pg = NULL;
struct alua_port_group *pg = NULL;
unsigned int optimize = 0, argc;
const char *p = params;
int result = SCSI_DH_OK;
@ -984,7 +986,7 @@ static int alua_activate(struct scsi_device *sdev,
struct alua_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK;
struct alua_queue_data *qdata;
struct alua_port_group __rcu *pg;
struct alua_port_group *pg;
qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
if (!qdata) {
@ -1048,7 +1050,7 @@ static void alua_check(struct scsi_device *sdev, bool force)
static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct alua_dh_data *h = sdev->handler_data;
struct alua_port_group __rcu *pg;
struct alua_port_group *pg;
unsigned char state = SCSI_ACCESS_STATE_OPTIMAL;
int ret = BLKPREP_OK;
@ -1118,7 +1120,7 @@ static void alua_bus_detach(struct scsi_device *sdev)
struct alua_port_group *pg;
spin_lock(&h->pg_lock);
pg = h->pg;
pg = rcu_dereference_protected(h->pg, lockdep_is_held(&h->pg_lock));
rcu_assign_pointer(h->pg, NULL);
h->sdev = NULL;
spin_unlock(&h->pg_lock);