[SCSI] qla2xxx: Fix for locking issue between driver ISR and mailbox routines
The driver uses ha->mbx_cmd_flags variable to pass information between
its ISR and mailbox routines, however, it does so without the protection of
any locks. Under certain conditions, this can lead to multiple mailbox
command completions being signaled, which, in turn, leads to a false
mailbox timeout error for the subsequently issued mailbox command.
The issue occurs frequently but intermittenly with the Qlogic 8GFC mezz
card during card initialization, resulting in card initialization failure.
Signed-off-by: Gurinder (Sunny) Shergill <gurinder.shergill@hp.com>
Acked-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h
index 98ab921..0a5c895 100644
--- a/drivers/scsi/qla2xxx/qla_inline.h
+++ b/drivers/scsi/qla2xxx/qla_inline.h
@@ -278,3 +278,14 @@
set_bit(HOST_RAMP_UP_QUEUE_DEPTH, &vha->dpc_flags);
}
+
+static inline void
+qla2x00_handle_mbx_completion(struct qla_hw_data *ha, int status)
+{
+ if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
+ (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
+ set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
+ clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
+ complete(&ha->mbx_intr_comp);
+ }
+}
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 259d920..d2a4c75 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -104,14 +104,9 @@
RD_REG_WORD(®->hccr);
}
}
+ qla2x00_handle_mbx_completion(ha, status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
-
return (IRQ_HANDLED);
}
@@ -221,14 +216,9 @@
WRT_REG_WORD(®->hccr, HCCR_CLR_RISC_INT);
RD_REG_WORD_RELAXED(®->hccr);
}
+ qla2x00_handle_mbx_completion(ha, status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
-
return (IRQ_HANDLED);
}
@@ -2613,14 +2603,9 @@
if (unlikely(IS_QLA83XX(ha) && (ha->pdev->revision == 1)))
ndelay(3500);
}
+ qla2x00_handle_mbx_completion(ha, status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
-
return IRQ_HANDLED;
}
@@ -2763,13 +2748,9 @@
}
WRT_REG_DWORD(®->hccr, HCCRX_CLR_RISC_INT);
} while (0);
+ qla2x00_handle_mbx_completion(ha, status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
return IRQ_HANDLED;
}
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index 9e5d89d..3587ec2 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -179,8 +179,6 @@
wait_for_completion_timeout(&ha->mbx_intr_comp, mcp->tov * HZ);
- clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
-
} else {
ql_dbg(ql_dbg_mbx, vha, 0x1011,
"Cmd=%x Polling Mode.\n", command);
diff --git a/drivers/scsi/qla2xxx/qla_mr.c b/drivers/scsi/qla2xxx/qla_mr.c
index 937fed8..a6df558 100644
--- a/drivers/scsi/qla2xxx/qla_mr.c
+++ b/drivers/scsi/qla2xxx/qla_mr.c
@@ -148,9 +148,6 @@
spin_unlock_irqrestore(&ha->hardware_lock, flags);
wait_for_completion_timeout(&ha->mbx_intr_comp, mcp->tov * HZ);
-
- clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
-
} else {
ql_dbg(ql_dbg_mbx, vha, 0x112c,
"Cmd=%x Polling Mode.\n", command);
@@ -2934,13 +2931,10 @@
QLAFX00_CLR_INTR_REG(ha, clr_intr);
QLAFX00_RD_INTR_REG(ha);
}
+
+ qla2x00_handle_mbx_completion(ha, status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
return IRQ_HANDLED;
}
diff --git a/drivers/scsi/qla2xxx/qla_nx.c b/drivers/scsi/qla2xxx/qla_nx.c
index 10754f51..cce0cd0 100644
--- a/drivers/scsi/qla2xxx/qla_nx.c
+++ b/drivers/scsi/qla2xxx/qla_nx.c
@@ -2074,9 +2074,6 @@
}
WRT_REG_DWORD(®->host_int, 0);
}
- spin_unlock_irqrestore(&ha->hardware_lock, flags);
- if (!ha->flags.msi_enabled)
- qla82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
#ifdef QL_DEBUG_LEVEL_17
if (!irq && ha->flags.eeh_busy)
@@ -2085,11 +2082,12 @@
status, ha->mbx_cmd_flags, ha->flags.mbox_int, stat);
#endif
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
+ qla2x00_handle_mbx_completion(ha, status);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+ if (!ha->flags.msi_enabled)
+ qla82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
+
return IRQ_HANDLED;
}
@@ -2149,8 +2147,6 @@
WRT_REG_DWORD(®->host_int, 0);
} while (0);
- spin_unlock_irqrestore(&ha->hardware_lock, flags);
-
#ifdef QL_DEBUG_LEVEL_17
if (!irq && ha->flags.eeh_busy)
ql_log(ql_log_warn, vha, 0x5044,
@@ -2158,11 +2154,9 @@
status, ha->mbx_cmd_flags, ha->flags.mbox_int, stat);
#endif
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
- (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
- set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
- complete(&ha->mbx_intr_comp);
- }
+ qla2x00_handle_mbx_completion(ha, status);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
return IRQ_HANDLED;
}
@@ -3345,7 +3339,7 @@
ha->flags.mbox_busy = 0;
ql_log(ql_log_warn, vha, 0x6010,
"Doing premature completion of mbx command.\n");
- if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags))
+ if (test_and_clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags))
complete(&ha->mbx_intr_comp);
}
}