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[SCSI] ips: Fix initialization bug with kdump

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If I/O is active on the adapter, and an unexpected interrupt is pending
during initialization, the driver blows it's brains out. Since the driver
didn't initiate the I/O, the data in it's internal tables will contain NULL
pointers.

When this condition is detected, a "flush cache and reset" is performed.
The flush cache allows any pending "lazy writes" that the adapter is
processing to complete ( a "must have" for a RAID adapter ) and the reset
puts the adapter back into a known, good state.

Signed-off-by: Jack Hammer <jack_hammer@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Jack Hammer 2005-08-29 10:44:34 -04:00 committed by James Bottomley
parent a3632fa3ec
commit ee807c2d43
1 changed files with 93 additions and 0 deletions
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93
drivers/scsi/ips.c
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@ -355,6 +355,9 @@ static int ips_init_phase2(int index);
static int ips_init_phase1(struct pci_dev *pci_dev, int *indexPtr);
static int ips_register_scsi(int index);
static int ips_poll_for_flush_complete(ips_ha_t * ha);
static void ips_flush_and_reset(ips_ha_t *ha);
/*
* global variables
*/
@ -4830,6 +4833,9 @@ ips_isinit_morpheus(ips_ha_t * ha)
uint32_t bits;
METHOD_TRACE("ips_is_init_morpheus", 1);
if (ips_isintr_morpheus(ha))
ips_flush_and_reset(ha);
post = readl(ha->mem_ptr + IPS_REG_I960_MSG0);
bits = readl(ha->mem_ptr + IPS_REG_I2O_HIR);
@ -4842,6 +4848,93 @@ ips_isinit_morpheus(ips_ha_t * ha)
return (1);
}
/****************************************************************************/
/* */
/* Routine Name: ips_flush_and_reset */
/* */
/* Routine Description: */
/* */
/* Perform cleanup ( FLUSH and RESET ) when the adapter is in an unknown */
/* state ( was trying to INIT and an interrupt was already pending ) ... */
/* */
/****************************************************************************/
static void
ips_flush_and_reset(ips_ha_t *ha)
{
ips_scb_t *scb;
int ret;
int time;
int done;
dma_addr_t command_dma;
/* Create a usuable SCB */
scb = pci_alloc_consistent(ha->pcidev, sizeof(ips_scb_t), &command_dma);
if (scb) {
memset(scb, 0, sizeof(ips_scb_t));
ips_init_scb(ha, scb);
scb->scb_busaddr = command_dma;
scb->timeout = ips_cmd_timeout;
scb->cdb[0] = IPS_CMD_FLUSH;
scb->cmd.flush_cache.op_code = IPS_CMD_FLUSH;
scb->cmd.flush_cache.command_id = IPS_MAX_CMDS; /* Use an ID that would otherwise not exist */
scb->cmd.flush_cache.state = IPS_NORM_STATE;
scb->cmd.flush_cache.reserved = 0;
scb->cmd.flush_cache.reserved2 = 0;
scb->cmd.flush_cache.reserved3 = 0;
scb->cmd.flush_cache.reserved4 = 0;
ret = ips_send_cmd(ha, scb); /* Send the Flush Command */
if (ret == IPS_SUCCESS) {
time = 60 * IPS_ONE_SEC; /* Max Wait time is 60 seconds */
done = 0;
while ((time > 0) && (!done)) {
done = ips_poll_for_flush_complete(ha);
/* This may look evil, but it's only done during extremely rare start-up conditions ! */
udelay(1000);
time--;
}
}
}
/* Now RESET and INIT the adapter */
(*ha->func.reset) (ha);
pci_free_consistent(ha->pcidev, sizeof(ips_scb_t), scb, command_dma);
return;
}
/****************************************************************************/
/* */
/* Routine Name: ips_poll_for_flush_complete */
/* */
/* Routine Description: */
/* */
/* Poll for the Flush Command issued by ips_flush_and_reset() to complete */
/* All other responses are just taken off the queue and ignored */
/* */
/****************************************************************************/
static int
ips_poll_for_flush_complete(ips_ha_t * ha)
{
IPS_STATUS cstatus;
while (TRUE) {
cstatus.value = (*ha->func.statupd) (ha);
if (cstatus.value == 0xffffffff) /* If No Interrupt to process */
break;
/* Success is when we see the Flush Command ID */
if (cstatus.fields.command_id == IPS_MAX_CMDS )
return 1;
}
return 0;
/****************************************************************************/
/* */
/* Routine Name: ips_enable_int_copperhead */