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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-06-22 14:53:07 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-07-02 16:44:32 -0400 |
| commit | e936a38ac92dd40867ac3b52cfd8f3f70fe717a5 (patch) | |
| tree | ce514ffd9409a92eceafb7c53b063f622c6a802f /drivers/target/target_core_ua.c | |
| parent | 325c1e8b248ed12a685d0a904b774abef3821e8e (diff) | |
| download | linux-stable-e936a38ac92dd40867ac3b52cfd8f3f70fe717a5.tar.gz linux-stable-e936a38ac92dd40867ac3b52cfd8f3f70fe717a5.tar.bz2 linux-stable-e936a38ac92dd40867ac3b52cfd8f3f70fe717a5.zip | |
scsi: target: Remove se_dev_entry.ua_count
se_dev_entry.ua_count is only used to check whether or not
se_dev_entry.ua_list is empty. Use list_empty_careful() instead. Checking
whether or not ua_list is empty without holding the lock that protects that
list is fine because the code that dequeues from that list will check again
whether or not that list is empty.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target/target_core_ua.c')
| -rw-r--r-- | drivers/target/target_core_ua.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/drivers/target/target_core_ua.c b/drivers/target/target_core_ua.c index 9399b38339f9..c8ac242ce888 100644 --- a/drivers/target/target_core_ua.c +++ b/drivers/target/target_core_ua.c @@ -55,7 +55,7 @@ target_scsi3_ua_check(struct se_cmd *cmd) rcu_read_unlock(); return 0; } - if (!atomic_read(&deve->ua_count)) { + if (list_empty_careful(&deve->ua_list)) { rcu_read_unlock(); return 0; } @@ -154,7 +154,6 @@ int core_scsi3_ua_allocate( &deve->ua_list); spin_unlock(&deve->ua_lock); - atomic_inc_mb(&deve->ua_count); return 0; } list_add_tail(&ua->ua_nacl_list, &deve->ua_list); @@ -164,7 +163,6 @@ int core_scsi3_ua_allocate( " 0x%02x, ASCQ: 0x%02x\n", deve->mapped_lun, asc, ascq); - atomic_inc_mb(&deve->ua_count); return 0; } @@ -196,8 +194,6 @@ void core_scsi3_ua_release_all( list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); - - atomic_dec_mb(&deve->ua_count); } spin_unlock(&deve->ua_lock); } @@ -263,8 +259,6 @@ bool core_scsi3_ua_for_check_condition(struct se_cmd *cmd, u8 *key, u8 *asc, } list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); - - atomic_dec_mb(&deve->ua_count); } spin_unlock(&deve->ua_lock); rcu_read_unlock(); @@ -304,7 +298,7 @@ int core_scsi3_ua_clear_for_request_sense( rcu_read_unlock(); return -EINVAL; } - if (!atomic_read(&deve->ua_count)) { + if (list_empty_careful(&deve->ua_list)) { rcu_read_unlock(); return -EPERM; } @@ -327,8 +321,6 @@ int core_scsi3_ua_clear_for_request_sense( } list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); - - atomic_dec_mb(&deve->ua_count); } spin_unlock(&deve->ua_lock); rcu_read_unlock(); |