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[SCSI] ipr: fix eeh recovery for 64-bit adapters 

In some scenarios, an EEH error can take a long time to be detected, since the
driver issues an MMIO read only after a device reset command times out and we
try to reset the adapter. This patch adds some code in ipr_cancel_op() to read
a hardware register so we detect the error earlier in case the op is being
aborted because of a timeout caused by a frozen adapter slot.

Another problem in such scenarios is that in __ipr_eh_host_reset() we change the
dump state flag from WAIT_FOR_DUMP to GET_DUMP, and the flag is later changed
from GET_DUMP to READ_DUMP in ipr_reset_restore_cfg_space(). However, if when
__ipr_eh_host_reset() is called by the SCSI error handling the function
ipr_reset_restore_cfg_space() has already been called by the PCI EEH code, we
end up with the flag in an inconsistent state. This patch also prevents this
problem.

Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Kleber Sacilotto de Souza 2012-01-16 19:30:25 -02:00 committed by James Bottomley
parent 7fbd764881
commit a92fa25c63
1 changed files with 18 additions and 6 deletions
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24
drivers/scsi/ipr.c
View File

@ -4613,11 +4613,13 @@ static int __ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
ENTER;
ioa_cfg = (struct ipr_ioa_cfg *) scsi_cmd->device->host->hostdata;
dev_err(&ioa_cfg->pdev->dev,
"Adapter being reset as a result of error recovery.\n");
if (!ioa_cfg->in_reset_reload) {
dev_err(&ioa_cfg->pdev->dev,
"Adapter being reset as a result of error recovery.\n");
if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
ioa_cfg->sdt_state = GET_DUMP;
if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
ioa_cfg->sdt_state = GET_DUMP;
}
rc = ipr_reset_reload(ioa_cfg, IPR_SHUTDOWN_ABBREV);
@ -4907,7 +4909,7 @@ static int ipr_cancel_op(struct scsi_cmnd * scsi_cmd)
struct ipr_ioa_cfg *ioa_cfg;
struct ipr_resource_entry *res;
struct ipr_cmd_pkt *cmd_pkt;
u32 ioasc;
u32 ioasc, int_reg;
int op_found = 0;
ENTER;
@ -4920,7 +4922,17 @@ static int ipr_cancel_op(struct scsi_cmnd * scsi_cmd)
*/
if (ioa_cfg->in_reset_reload || ioa_cfg->ioa_is_dead)
return FAILED;
if (!res || !ipr_is_gscsi(res))
if (!res)
return FAILED;
/*
* If we are aborting a timed out op, chances are that the timeout was caused
* by a still not detected EEH error. In such cases, reading a register will
* trigger the EEH recovery infrastructure.
*/
int_reg = readl(ioa_cfg->regs.sense_interrupt_reg);
if (!ipr_is_gscsi(res))
return FAILED;
list_for_each_entry(ipr_cmd, &ioa_cfg->pending_q, queue) {