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[SCSI] qla4xxx: bug fixes

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The included patch fixes the following issues:

1. qla3xxx/qla4xxx co-existence issue which can result in a lockup
when qla3xxx driver is unloaded, or when ifdown; ifup is performed on
one of the interfaces correponding to qla3xxx. This is because qla4xxx
HBA supports one ethernet and iscsi interfaces per port. Both iscsi
and ethernet interfaces share the same state machine. The problem has
to do with synchronizing access to the state machine in the event of a
reset

2. mutex_lock() is sometimes not followed by mutex_unlock() prior to
invoking a msleep() in qla4xxx_mailbox_command()

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
David C Somayajulu
2007-01-22 12:26:11 -08:00
committed by James Bottomley
parent 938e2ac0b7
commit 477ffb9d87
7 changed files with 73 additions and 52 deletions
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18
drivers/scsi/qla4xxx/ql4_init.c
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@@ -958,25 +958,25 @@ static int qla4xxx_start_firmware_from_flash(struct scsi_qla_host *ha)
return status;
}
int ql4xxx_lock_drvr_wait(struct scsi_qla_host *a)
int ql4xxx_lock_drvr_wait(struct scsi_qla_host *ha)
{
#define QL4_LOCK_DRVR_WAIT 300
#define QL4_LOCK_DRVR_SLEEP 100
#define QL4_LOCK_DRVR_WAIT 30
#define QL4_LOCK_DRVR_SLEEP 1
int drvr_wait = QL4_LOCK_DRVR_WAIT;
while (drvr_wait) {
if (ql4xxx_lock_drvr(a) == 0) {
msleep(QL4_LOCK_DRVR_SLEEP);
if (ql4xxx_lock_drvr(ha) == 0) {
ssleep(QL4_LOCK_DRVR_SLEEP);
if (drvr_wait) {
DEBUG2(printk("scsi%ld: %s: Waiting for "
"Global Init Semaphore...n",
a->host_no,
__func__));
"Global Init Semaphore(%d)...n",
ha->host_no,
__func__, drvr_wait));
}
drvr_wait -= QL4_LOCK_DRVR_SLEEP;
} else {
DEBUG2(printk("scsi%ld: %s: Global Init Semaphore "
"acquired.n", a->host_no, __func__));
"acquired.n", ha->host_no, __func__));
return QLA_SUCCESS;
}
}