[SCSI] qla4xxx: Reduce rom-lock contention during reset recovery.
Issue:
Driver holds rom-lock for too long during reset recovery.
During adapter reset testing, it was found that the driver
holds the rom-lock for too long, because of which other
drivers fail to acquire the rom-lock, leading to reset
failures.
The primary cause is, in the bootstrap code, while
holding the rom-lock, the driver checks if the peg is
halted, causing a 2 second contention.
Fix:
When a reset recovery starts, the driver deduces the cause, and
sets appropriate flags in watchdog & recover_adapter routines.
This flag should be used to determine if bootstrap is invoked
from probe or reset context, reducing the rom-lock footprint of
the drivers.
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c
index d2040b4..63328c8 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.c
+++ b/drivers/scsi/qla4xxx/ql4_nx.c
@@ -2828,37 +2828,28 @@
int rval = QLA_ERROR;
int i;
uint32_t old_count, count;
- int need_reset = 0, peg_stuck = 1;
+ int need_reset = 0;
need_reset = ha->isp_ops->need_reset(ha);
- old_count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER);
-
- for (i = 0; i < 10; i++) {
- msleep(200);
- count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER);
- if (count != old_count)
- peg_stuck = 0;
- }
if (need_reset) {
/* We are trying to perform a recovery here. */
- if (peg_stuck)
+ if (test_bit(AF_FW_RECOVERY, &ha->flags))
ha->isp_ops->rom_lock_recovery(ha);
- goto dev_initialize;
} else {
- /* Start of day for this ha context. */
- if (peg_stuck) {
- /* Either we are the first or recovery in progress. */
- ha->isp_ops->rom_lock_recovery(ha);
- goto dev_initialize;
- } else {
- /* Firmware already running. */
- rval = QLA_SUCCESS;
- goto dev_ready;
+ old_count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER);
+ for (i = 0; i < 10; i++) {
+ msleep(200);
+ count = qla4_8xxx_rd_direct(ha,
+ QLA8XXX_PEG_ALIVE_COUNTER);
+ if (count != old_count) {
+ rval = QLA_SUCCESS;
+ goto dev_ready;
+ }
}
+ ha->isp_ops->rom_lock_recovery(ha);
}
-dev_initialize:
/* set to DEV_INITIALIZING */
ql4_printk(KERN_INFO, ha, "HW State: INITIALIZING\n");
qla4_8xxx_wr_direct(ha, QLA8XXX_CRB_DEV_STATE,
