From: Nicholas Bellinger <n...@linux-iscsi.org>
This patch converts target_core_ua.c code to use RCU read path macros
for se_node_acl->lun_entry_hlist[] access.
Cc: Hannes Reinecke <h...@suse.de>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Sagi Grimberg <sa...@mellanox.com>
Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org>
---
drivers/target/target_core_ua.c | 35 +++++++++++++++++++----------------
1 file changed, 19 insertions(+), 16 deletions(-)
diff --git a/drivers/target/target_core_ua.c b/drivers/target/target_core_ua.c
index 1738b16..975dbba 100644
--- a/drivers/target/target_core_ua.c
+++ b/drivers/target/target_core_ua.c
@@ -51,9 +51,13 @@ target_scsi3_ua_check(struct se_cmd *cmd)
if (!nacl)
return 0;
- deve = nacl->device_list[cmd->orig_fe_lun];
- if (!atomic_read(&deve->ua_count))
+ rcu_read_lock();
+ deve = rcu_dereference(nacl->lun_entry_hlist[cmd->orig_fe_lun]);
+ if (!atomic_read(&deve->ua_count)) {
+ rcu_read_unlock();
return 0;
+ }
+ rcu_read_unlock();
/*
* From sam4r14, section 5.14 Unit attention condition:
*
@@ -104,9 +108,8 @@ int core_scsi3_ua_allocate(
ua->ua_asc = asc;
ua->ua_ascq = ascq;
- spin_lock_irq(&nacl->device_list_lock);
- deve = nacl->device_list[unpacked_lun];
-
+ rcu_read_lock();
+ deve = rcu_dereference(nacl->lun_entry_hlist[unpacked_lun]);
spin_lock(&deve->ua_lock);
list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) {
/*
@@ -114,7 +117,7 @@ int core_scsi3_ua_allocate(
*/
if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) {
spin_unlock(&deve->ua_lock);
- spin_unlock_irq(&nacl->device_list_lock);
+ rcu_read_unlock();
kmem_cache_free(se_ua_cache, ua);
return 0;
}
@@ -159,14 +162,13 @@ int core_scsi3_ua_allocate(
list_add_tail(&ua->ua_nacl_list,
&deve->ua_list);
spin_unlock(&deve->ua_lock);
- spin_unlock_irq(&nacl->device_list_lock);
atomic_inc_mb(&deve->ua_count);
+ rcu_read_unlock();
return 0;
}
list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
spin_unlock(&deve->ua_lock);
- spin_unlock_irq(&nacl->device_list_lock);
pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:"
" 0x%02x, ASCQ: 0x%02x\n",
@@ -174,6 +176,7 @@ int core_scsi3_ua_allocate(
asc, ascq);
atomic_inc_mb(&deve->ua_count);
+ rcu_read_unlock();
return 0;
}
@@ -211,10 +214,10 @@ void core_scsi3_ua_for_check_condition(
if (!nacl)
return;
- spin_lock_irq(&nacl->device_list_lock);
- deve = nacl->device_list[cmd->orig_fe_lun];
+ rcu_read_lock();
+ deve = rcu_dereference(nacl->lun_entry_hlist[cmd->orig_fe_lun]);
if (!atomic_read(&deve->ua_count)) {
- spin_unlock_irq(&nacl->device_list_lock);
+ rcu_read_unlock();
return;
}
/*
@@ -250,7 +253,7 @@ void core_scsi3_ua_for_check_condition(
atomic_dec_mb(&deve->ua_count);
}
spin_unlock(&deve->ua_lock);
- spin_unlock_irq(&nacl->device_list_lock);
+ rcu_read_unlock();
pr_debug("[%s]: %s UNIT ATTENTION condition with"
" INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x"
@@ -279,10 +282,10 @@ int core_scsi3_ua_clear_for_request_sense(
if (!nacl)
return -EINVAL;
- spin_lock_irq(&nacl->device_list_lock);
- deve = nacl->device_list[cmd->orig_fe_lun];
+ rcu_read_lock();
+ deve = rcu_dereference(nacl->lun_entry_hlist[cmd->orig_fe_lun]);
if (!atomic_read(&deve->ua_count)) {
- spin_unlock_irq(&nacl->device_list_lock);
+ rcu_read_unlock();
return -EPERM;
}
/*
@@ -308,7 +311,7 @@ int core_scsi3_ua_clear_for_request_sense(
atomic_dec_mb(&deve->ua_count);
}
spin_unlock(&deve->ua_lock);
- spin_unlock_irq(&nacl->device_list_lock);
+ rcu_read_unlock();
pr_debug("[%s]: Released UNIT ATTENTION condition, mapped"
" LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x,"
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
