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[SCSI] lpfc 8.3.31: Fixed system panic due to midlayer abort and driver complete race on SCSI cmd 

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
James Smart 2012-05-09 21:17:07 -04:00 committed by James Bottomley
parent a7dd9c0f44
commit 4f2e66c6d2
5 changed files with 54 additions and 21 deletions
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1
drivers/scsi/lpfc/lpfc.h
View File

@ -620,6 +620,7 @@ struct lpfc_hba {
#define HBA_AER_ENABLED 0x1000 /* AER enabled with HBA */
#define HBA_DEVLOSS_TMO 0x2000 /* HBA in devloss timeout */
#define HBA_RRQ_ACTIVE 0x4000 /* process the rrq active list */
#define HBA_FCP_IOQ_FLUSH 0x8000 /* FCP I/O queues being flushed */
uint32_t fcp_ring_in_use; /* When polling test if intr-hndlr active*/
struct lpfc_dmabuf slim2p;

1
drivers/scsi/lpfc/lpfc_crtn.h
View File

@ -254,6 +254,7 @@ int
lpfc_sli_handle_fast_ring_event(struct lpfc_hba *,
struct lpfc_sli_ring *, uint32_t);
struct lpfc_iocbq *__lpfc_sli_get_iocbq(struct lpfc_hba *);
struct lpfc_iocbq * lpfc_sli_get_iocbq(struct lpfc_hba *);
void lpfc_sli_release_iocbq(struct lpfc_hba *, struct lpfc_iocbq *);
uint16_t lpfc_sli_next_iotag(struct lpfc_hba *, struct lpfc_iocbq *);

48
drivers/scsi/lpfc/lpfc_scsi.c
View File

@ -4396,8 +4396,20 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
ret = fc_block_scsi_eh(cmnd);
if (ret)
return ret;
spin_lock_irq(&phba->hbalock);
/* driver queued commands are in process of being flushed */
if (phba->hba_flag & HBA_FCP_IOQ_FLUSH) {
spin_unlock_irq(&phba->hbalock);
lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
"3168 SCSI Layer abort requested I/O has been "
"flushed by LLD.\n");
return FAILED;
}
lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
if (!lpfc_cmd) {
spin_unlock_irq(&phba->hbalock);
lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
"2873 SCSI Layer I/O Abort Request IO CMPL Status "
"x%x ID %d LUN %d\n",
@ -4405,23 +4417,34 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
return SUCCESS;
}
iocb = &lpfc_cmd->cur_iocbq;
/* the command is in process of being cancelled */
if (!(iocb->iocb_flag & LPFC_IO_ON_TXCMPLQ)) {
spin_unlock_irq(&phba->hbalock);
lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
"3169 SCSI Layer abort requested I/O has been "
"cancelled by LLD.\n");
return FAILED;
}
/*
* If pCmd field of the corresponding lpfc_scsi_buf structure
* points to a different SCSI command, then the driver has
* already completed this command, but the midlayer did not
* see the completion before the eh fired. Just return
* SUCCESS.
* see the completion before the eh fired. Just return SUCCESS.
*/
iocb = &lpfc_cmd->cur_iocbq;
if (lpfc_cmd->pCmd != cmnd)
goto out;
if (lpfc_cmd->pCmd != cmnd) {
lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
"3170 SCSI Layer abort requested I/O has been "
"completed by LLD.\n");
goto out_unlock;
}
BUG_ON(iocb->context1 != lpfc_cmd);
abtsiocb = lpfc_sli_get_iocbq(phba);
abtsiocb = __lpfc_sli_get_iocbq(phba);
if (abtsiocb == NULL) {
ret = FAILED;
goto out;
goto out_unlock;
}
/*
@ -4453,6 +4476,9 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
abtsiocb->vport = vport;
/* no longer need the lock after this point */
spin_unlock_irq(&phba->hbalock);
if (lpfc_sli_issue_iocb(phba, LPFC_FCP_RING, abtsiocb, 0) ==
IOCB_ERROR) {
lpfc_sli_release_iocbq(phba, abtsiocb);
@ -4469,10 +4495,7 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
wait_event_timeout(waitq,
(lpfc_cmd->pCmd != cmnd),
(2*vport->cfg_devloss_tmo*HZ));
spin_lock_irq(shost->host_lock);
lpfc_cmd->waitq = NULL;
spin_unlock_irq(shost->host_lock);
if (lpfc_cmd->pCmd == cmnd) {
ret = FAILED;
@ -4482,8 +4505,11 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
"LUN %d\n",
ret, cmnd->device->id, cmnd->device->lun);
}
goto out;
out:
out_unlock:
spin_unlock_irq(&phba->hbalock);
out:
lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
"0749 SCSI Layer I/O Abort Request Status x%x ID %d "
"LUN %d\n", ret, cmnd->device->id,

23
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -502,7 +502,7 @@ lpfc_resp_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
* allocation is successful, it returns pointer to the newly
* allocated iocb object else it returns NULL.
**/
static struct lpfc_iocbq *
struct lpfc_iocbq *
__lpfc_sli_get_iocbq(struct lpfc_hba *phba)
{
struct list_head *lpfc_iocb_list = &phba->lpfc_iocb_list;
@ -1259,7 +1259,7 @@ lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
struct lpfc_iocbq *piocb)
{
list_add_tail(&piocb->list, &pring->txcmplq);
piocb->iocb_flag |= LPFC_IO_ON_Q;
piocb->iocb_flag |= LPFC_IO_ON_TXCMPLQ;
pring->txcmplq_cnt++;
if (pring->txcmplq_cnt > pring->txcmplq_max)
pring->txcmplq_max = pring->txcmplq_cnt;
@ -2558,9 +2558,9 @@ lpfc_sli_iocbq_lookup(struct lpfc_hba *phba,
if (iotag != 0 && iotag <= phba->sli.last_iotag) {
cmd_iocb = phba->sli.iocbq_lookup[iotag];
list_del_init(&cmd_iocb->list);
if (cmd_iocb->iocb_flag & LPFC_IO_ON_Q) {
if (cmd_iocb->iocb_flag & LPFC_IO_ON_TXCMPLQ) {
pring->txcmplq_cnt--;
cmd_iocb->iocb_flag &= ~LPFC_IO_ON_Q;
cmd_iocb->iocb_flag &= ~LPFC_IO_ON_TXCMPLQ;
}
return cmd_iocb;
}
@ -2593,14 +2593,14 @@ lpfc_sli_iocbq_lookup_by_tag(struct lpfc_hba *phba,
if (iotag != 0 && iotag <= phba->sli.last_iotag) {
cmd_iocb = phba->sli.iocbq_lookup[iotag];
list_del_init(&cmd_iocb->list);
if (cmd_iocb->iocb_flag & LPFC_IO_ON_Q) {
cmd_iocb->iocb_flag &= ~LPFC_IO_ON_Q;
if (cmd_iocb->iocb_flag & LPFC_IO_ON_TXCMPLQ) {
/* remove from txcmpl queue list */
list_del_init(&cmd_iocb->list);
cmd_iocb->iocb_flag &= ~LPFC_IO_ON_TXCMPLQ;
pring->txcmplq_cnt--;
return cmd_iocb;
}
return cmd_iocb;
}
lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
"0372 iotag x%x is out off range: max iotag (x%x)\n",
iotag, phba->sli.last_iotag);
@ -3468,6 +3468,9 @@ lpfc_sli_flush_fcp_rings(struct lpfc_hba *phba)
/* Retrieve everything on the txcmplq */
list_splice_init(&pring->txcmplq, &txcmplq);
pring->txcmplq_cnt = 0;
/* Indicate the I/O queues are flushed */
phba->hba_flag |= HBA_FCP_IOQ_FLUSH;
spin_unlock_irq(&phba->hbalock);
/* Flush the txq */
@ -6069,6 +6072,8 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phba)
else
phba->hba_flag &= ~HBA_FIP_SUPPORT;
phba->hba_flag &= ~HBA_FCP_IOQ_FLUSH;
if (phba->sli_rev != LPFC_SLI_REV4) {
lpfc_printf_log(phba, KERN_ERR, LOG_MBOX | LOG_SLI,
"0376 READ_REV Error. SLI Level %d "

2
drivers/scsi/lpfc/lpfc_sli.h
View File

@ -68,7 +68,7 @@ struct lpfc_iocbq {
#define LPFC_EXCHANGE_BUSY 0x40 /* SLI4 hba reported XB in response */
#define LPFC_USE_FCPWQIDX 0x80 /* Submit to specified FCPWQ index */
#define DSS_SECURITY_OP 0x100 /* security IO */
#define LPFC_IO_ON_Q 0x200 /* The IO is still on the TXCMPLQ */
#define LPFC_IO_ON_TXCMPLQ 0x200 /* The IO is still on the TXCMPLQ */
#define LPFC_IO_DIF 0x400 /* T10 DIF IO */
#define LPFC_FIP_ELS_ID_MASK 0xc000 /* ELS_ID range 0-3, non-shifted mask */