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Date: Thu, 20 Feb 2014 09:07:52 +0100
From: Paul Bolle <pebolle@...cali.nl>
To: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>,
linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] target_core_alua: silence GCC warning
Building target_core_alua.o triggers a GCC warning:
drivers/target/target_core_alua.c: In function ‘target_alua_state_check’:
drivers/target/target_core_alua.c:773:18: warning: ‘alua_ascq’ may be used uninitialized in this function [-Wmaybe-uninitialized]
cmd->scsi_ascq = alua_ascq;
^
This is a false positive. A little trial and error shows it is
apparently caused by core_alua_state_lba_dependent(). It must be hard
for GCC to track the branches of a switch statement, inside a
list_for_each_entry loop, inside a while loop.
But if we add a small (inline) helper function we can reorganize the
code a bit. That also allows to drop alua_ascq which, obviously, gets
rid of this warning.
Signed-off-by: Paul Bolle <pebolle@...cali.nl>
---
v2: Make core_alua_state_nonoptimized() return void, as Geert
suggested.
Also keep core_alua_state_lba_dependent() inline. Setting that function
noinline was just a leftover from the trial and error fase, and isn't
needed to make the warning go away. Ie, I was sloppy in v1!
Still compile tested only.
drivers/target/target_core_alua.c | 95 ++++++++++++++++++---------------------
1 file changed, 44 insertions(+), 51 deletions(-)
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index c3d9df6..fcbe612 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -455,11 +455,26 @@ out:
return rc;
}
-static inline int core_alua_state_nonoptimized(
+static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
+{
+ /*
+ * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
+ * The ALUA additional sense code qualifier (ASCQ) is determined
+ * by the ALUA primary or secondary access state..
+ */
+ pr_debug("[%s]: ALUA TG Port not available, "
+ "SenseKey: NOT_READY, ASC/ASCQ: "
+ "0x04/0x%02x\n",
+ cmd->se_tfo->get_fabric_name(), alua_ascq);
+
+ cmd->scsi_asc = 0x04;
+ cmd->scsi_ascq = alua_ascq;
+}
+
+static inline void core_alua_state_nonoptimized(
struct se_cmd *cmd,
unsigned char *cdb,
- int nonop_delay_msecs,
- u8 *alua_ascq)
+ int nonop_delay_msecs)
{
/*
* Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
@@ -468,13 +483,11 @@ static inline int core_alua_state_nonoptimized(
*/
cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
cmd->alua_nonop_delay = nonop_delay_msecs;
- return 0;
}
static inline int core_alua_state_lba_dependent(
struct se_cmd *cmd,
- struct t10_alua_tg_pt_gp *tg_pt_gp,
- u8 *alua_ascq)
+ struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_device *dev = cmd->se_dev;
u64 segment_size, segment_mult, sectors, lba;
@@ -520,7 +533,7 @@ static inline int core_alua_state_lba_dependent(
}
if (!cur_map) {
spin_unlock(&dev->t10_alua.lba_map_lock);
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
@@ -531,11 +544,11 @@ static inline int core_alua_state_lba_dependent(
switch(map_mem->lba_map_mem_alua_state) {
case ALUA_ACCESS_STATE_STANDBY:
spin_unlock(&dev->t10_alua.lba_map_lock);
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
case ALUA_ACCESS_STATE_UNAVAILABLE:
spin_unlock(&dev->t10_alua.lba_map_lock);
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
default:
break;
@@ -548,8 +561,7 @@ static inline int core_alua_state_lba_dependent(
static inline int core_alua_state_standby(
struct se_cmd *cmd,
- unsigned char *cdb,
- u8 *alua_ascq)
+ unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
@@ -570,7 +582,7 @@ static inline int core_alua_state_standby(
case MI_REPORT_TARGET_PGS:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
case MAINTENANCE_OUT:
@@ -578,7 +590,7 @@ static inline int core_alua_state_standby(
case MO_SET_TARGET_PGS:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
case REQUEST_SENSE:
@@ -588,7 +600,7 @@ static inline int core_alua_state_standby(
case WRITE_BUFFER:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
@@ -597,8 +609,7 @@ static inline int core_alua_state_standby(
static inline int core_alua_state_unavailable(
struct se_cmd *cmd,
- unsigned char *cdb,
- u8 *alua_ascq)
+ unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
@@ -613,7 +624,7 @@ static inline int core_alua_state_unavailable(
case MI_REPORT_TARGET_PGS:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
case MAINTENANCE_OUT:
@@ -621,7 +632,7 @@ static inline int core_alua_state_unavailable(
case MO_SET_TARGET_PGS:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
case REQUEST_SENSE:
@@ -629,7 +640,7 @@ static inline int core_alua_state_unavailable(
case WRITE_BUFFER:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
@@ -638,8 +649,7 @@ static inline int core_alua_state_unavailable(
static inline int core_alua_state_transition(
struct se_cmd *cmd,
- unsigned char *cdb,
- u8 *alua_ascq)
+ unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
@@ -654,7 +664,7 @@ static inline int core_alua_state_transition(
case MI_REPORT_TARGET_PGS:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
+ set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
return 1;
}
case REQUEST_SENSE:
@@ -662,7 +672,7 @@ static inline int core_alua_state_transition(
case WRITE_BUFFER:
return 0;
default:
- *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
+ set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
return 1;
}
@@ -684,8 +694,6 @@ target_alua_state_check(struct se_cmd *cmd)
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
int out_alua_state, nonop_delay_msecs;
- u8 alua_ascq;
- int ret;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
@@ -701,9 +709,8 @@ target_alua_state_check(struct se_cmd *cmd)
if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
pr_debug("ALUA: Got secondary offline status for local"
" target port\n");
- alua_ascq = ASCQ_04H_ALUA_OFFLINE;
- ret = 1;
- goto out;
+ set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
+ return TCM_CHECK_CONDITION_NOT_READY;
}
/*
* Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
@@ -731,20 +738,23 @@ target_alua_state_check(struct se_cmd *cmd)
switch (out_alua_state) {
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
- ret = core_alua_state_nonoptimized(cmd, cdb,
- nonop_delay_msecs, &alua_ascq);
+ core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
break;
case ALUA_ACCESS_STATE_STANDBY:
- ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
+ if (core_alua_state_standby(cmd, cdb))
+ return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_UNAVAILABLE:
- ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
+ if (core_alua_state_unavailable(cmd, cdb))
+ return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_TRANSITION:
- ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
+ if (core_alua_state_transition(cmd, cdb))
+ return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
- ret = core_alua_state_lba_dependent(cmd, tg_pt_gp, &alua_ascq);
+ if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
+ return TCM_CHECK_CONDITION_NOT_READY;
break;
/*
* OFFLINE is a secondary ALUA target port group access state, that is
@@ -757,23 +767,6 @@ target_alua_state_check(struct se_cmd *cmd)
return TCM_INVALID_CDB_FIELD;
}
-out:
- if (ret > 0) {
- /*
- * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
- * The ALUA additional sense code qualifier (ASCQ) is determined
- * by the ALUA primary or secondary access state..
- */
- pr_debug("[%s]: ALUA TG Port not available, "
- "SenseKey: NOT_READY, ASC/ASCQ: "
- "0x04/0x%02x\n",
- cmd->se_tfo->get_fabric_name(), alua_ascq);
-
- cmd->scsi_asc = 0x04;
- cmd->scsi_ascq = alua_ascq;
- return TCM_CHECK_CONDITION_NOT_READY;
- }
-
return 0;
}
--
1.8.5.3
--
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