diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-03-25 01:02:57 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-06-01 00:24:00 -0700 |
| commit | 80bfdfa92481d431b199eff72788588d13a3988f (patch) | |
| tree | d3549786f0be21fb1f1f6abbdf1190e9cc4aaece /drivers/target/target_core_device.c | |
| parent | 29a05deebf6c2e3010934fb78ee65cab3d329470 (diff) | |
| download | linux-80bfdfa92481d431b199eff72788588d13a3988f.tar.bz2 | |
target/pr: Use atomic bitop for se_dev_entry->deve_flags reservation check
This patch converts the core_scsi3_pr_seq_non_holder() check for non
reservation holding registrations to use an atomic bitop in ->deve_flags
to determine if a registration is currently active.
It also includes associated a set_bit() in __core_scsi3_add_registration()
and clear_bit() in __core_scsi3_free_registration(), if se_dev_entry still
exists, and has not already been released via se_dev_entry shutdown path
in core_disable_device_list_for_node().
Also, clear_bit in core_disable_device_list_for_node as well to ensure
the read-critical path in core_scsi3_pr_seq_non_holder() picks up the
new state, preceeding the final kfree_rcu() call.
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_device.c')
| -rw-r--r-- | drivers/target/target_core_device.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index e44e6bd66659..97792cc81fe4 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -413,6 +413,7 @@ void core_disable_device_list_for_node( core_scsi3_ua_release_all(orig); hlist_del_rcu(&orig->link); + clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); rcu_assign_pointer(orig->se_lun, NULL); rcu_assign_pointer(orig->se_lun_acl, NULL); orig->lun_flags = 0; |