Messages in this thread Patch in this message | | | From | Christophe JAILLET <> | Subject | [PATCH] scsi: target: Save a few cycles in 'transport_lookup_[cmd|tmr]_lun()' | Date | Wed, 3 Nov 2021 22:24:46 +0100 |
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Use 'percpu_ref_tryget_live_rcu()' instead of 'percpu_ref_tryget_live()' to save a few cycles when it is known that the rcu lock is already taken/released.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- drivers/target/target_core_device.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 44bb380e7390..bfd5d5606522 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -77,7 +77,7 @@ transport_lookup_cmd_lun(struct se_cmd *se_cmd) se_lun = rcu_dereference(deve->se_lun); - if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { + if (!percpu_ref_tryget_live_rcu(&se_lun->lun_ref)) { se_lun = NULL; goto out_unlock; } @@ -154,7 +154,7 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd) if (deve) { se_lun = rcu_dereference(deve->se_lun); - if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { + if (!percpu_ref_tryget_live_rcu(&se_lun->lun_ref)) { se_lun = NULL; goto out_unlock; } -- 2.30.2
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