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authorMichael Reed <mdr@sgi.com>2010-02-10 14:32:00 -0600
committerJames Bottomley <James.Bottomley@suse.de>2010-02-17 13:38:22 -0600
commit03cb3829e0e5650518ce37e2b4420a35e034dc9e (patch)
tree17ae96241e0eb7e62460150c83a1c374c9e79293 /drivers/message
parent4b5aa7cff0e2bd1a9c81b59553ba8ecfa3aa7e1b (diff)
downloadlinux-03cb3829e0e5650518ce37e2b4420a35e034dc9e.tar.bz2
[SCSI] fusion: hold off error recovery while alternate ioc is initializing
After discussing this patch with LSI, I resubmitting with a recommended 40 second wait for the alternate ioc's initialization to complete. -- Fusion FC chips are two function with some shared resources. During initialization of one function its driver inhibits the ability of the other function's driver to allocate message frames by clearing its "active" flag. Should mid-layer error recovery be initiated for a scsi command during this initialization (which can take up to 40 seconds) error recovery will escalate to the level of host reset. This host reset might fail (as the other function is resetting) resulting in all connected targets being taken offline. This patch holds off mid-layer error recovery for up to 40 seconds to permit initialization of the other function to complete. Signed-off-by: Michael Reed <mdr@sgi.com> Acked-by: "Desai, Kashyap" <Kashyap.Desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/message')
-rw-r--r--drivers/message/fusion/mptfc.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c
index ebf6ae024da4..612ab3c51a6b 100644
--- a/drivers/message/fusion/mptfc.c
+++ b/drivers/message/fusion/mptfc.c
@@ -195,29 +195,34 @@ mptfc_block_error_handler(struct scsi_cmnd *SCpnt,
unsigned long flags;
int ready;
MPT_ADAPTER *ioc;
+ int loops = 40; /* seconds */
hd = shost_priv(SCpnt->device->host);
ioc = hd->ioc;
spin_lock_irqsave(shost->host_lock, flags);
- while ((ready = fc_remote_port_chkready(rport) >> 16) == DID_IMM_RETRY) {
+ while ((ready = fc_remote_port_chkready(rport) >> 16) == DID_IMM_RETRY
+ || (loops > 0 && ioc->active == 0)) {
spin_unlock_irqrestore(shost->host_lock, flags);
dfcprintk (ioc, printk(MYIOC_s_DEBUG_FMT
"mptfc_block_error_handler.%d: %d:%d, port status is "
- "DID_IMM_RETRY, deferring %s recovery.\n",
+ "%x, active flag %d, deferring %s recovery.\n",
ioc->name, ioc->sh->host_no,
- SCpnt->device->id, SCpnt->device->lun, caller));
+ SCpnt->device->id, SCpnt->device->lun,
+ ready, ioc->active, caller));
msleep(1000);
spin_lock_irqsave(shost->host_lock, flags);
+ loops --;
}
spin_unlock_irqrestore(shost->host_lock, flags);
- if (ready == DID_NO_CONNECT || !SCpnt->device->hostdata) {
+ if (ready == DID_NO_CONNECT || !SCpnt->device->hostdata
+ || ioc->active == 0) {
dfcprintk (ioc, printk(MYIOC_s_DEBUG_FMT
"%s.%d: %d:%d, failing recovery, "
- "port state %d, vdevice %p.\n", caller,
+ "port state %x, active %d, vdevice %p.\n", caller,
ioc->name, ioc->sh->host_no,
SCpnt->device->id, SCpnt->device->lun, ready,
- SCpnt->device->hostdata));
+ ioc->active, SCpnt->device->hostdata));
return FAILED;
}
dfcprintk (ioc, printk(MYIOC_s_DEBUG_FMT