From: Nicholas Bellinger <n...@linux-iscsi.org>
This patch removes legacy se_cmd->t_fe_count usage in order to avoid
se_cmd->t_state_lock access within transport_put_cmd() during normal
fast path se_cmd descriptor release.
Also drop the left-over parameter usage within core_tmr_handle_tas_abort()
Cc: Christoph Hellwig <h...@lst.de>
Cc: Roland Dreier <rol...@kernel.org>
Cc: Kent Overstreet <koverstr...@google.com>
Cc: Or Gerlitz <ogerl...@mellanox.com>
Cc: Moussa Ba <mouss...@micron.com>
Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org>
---
drivers/target/target_core_tmr.c | 12 ++----------
drivers/target/target_core_transport.c | 19 -------------------
include/target/target_core_base.h | 1 -
3 files changed, 2 insertions(+), 30 deletions(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index d0b4dd9..0d7cacb 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -85,13 +85,8 @@ void core_tmr_release_req(
static void core_tmr_handle_tas_abort(
struct se_node_acl *tmr_nacl,
struct se_cmd *cmd,
- int tas,
- int fe_count)
+ int tas)
{
- if (!fe_count) {
- transport_cmd_finish_abort(cmd, 1);
- return;
- }
/*
* TASK ABORTED status (TAS) bit support
*/
@@ -253,7 +248,6 @@ static void core_tmr_drain_state_list(
LIST_HEAD(drain_task_list);
struct se_cmd *cmd, *next;
unsigned long flags;
- int fe_count;
/*
* Complete outstanding commands with TASK_ABORTED SAM status.
@@ -329,12 +323,10 @@ static void core_tmr_drain_state_list(
spin_lock_irqsave(&cmd->t_state_lock, flags);
target_stop_cmd(cmd, &flags);
- fe_count = atomic_read(&cmd->t_fe_count);
-
cmd->transport_state |= CMD_T_ABORTED;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
+ core_tmr_handle_tas_abort(tmr_nacl, cmd, tas);
}
}
diff --git a/drivers/target/target_core_transport.c
b/drivers/target/target_core_transport.c
index d062878..daa7aa8 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1967,24 +1967,8 @@ static void transport_release_cmd(struct se_cmd *cmd)
*/
static void transport_put_cmd(struct se_cmd *cmd)
{
- unsigned long flags;
-
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- if (atomic_read(&cmd->t_fe_count) &&
- !atomic_dec_and_test(&cmd->t_fe_count)) {
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
-
- if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
- cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
- target_remove_from_state_list(cmd);
- }
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
transport_free_pages(cmd);
transport_release_cmd(cmd);
- return;
}
void *transport_kmap_data_sg(struct se_cmd *cmd)
@@ -2100,9 +2084,6 @@ transport_generic_new_cmd(struct se_cmd *cmd)
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
-
- atomic_inc(&cmd->t_fe_count);
-
/*
* If this command is not a write we can execute it right here,
* for write buffers we need to notify the fabric driver first
diff --git a/include/target/target_core_base.h
b/include/target/target_core_base.h
index e773dfa..3b337b9 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -458,7 +458,6 @@ struct se_cmd {
unsigned char *t_task_cdb;
unsigned char __t_task_cdb[TCM_MAX_COMMAND_SIZE];
unsigned long long t_task_lba;
- atomic_t t_fe_count;
unsigned int transport_state;
#define CMD_T_ABORTED (1 << 0)
#define CMD_T_ACTIVE (1 << 1)
--
1.7.2.5
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