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bfa: Fix for crash when bfa_itnim is NULL

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Fix a very corner case when the port gets disconnected and the BFA and
FCS layers clean up references to the IT nexus.  During this window if a
task management command is issued by the SCSI-ML and ends up referencing
a NULL itnim, it could lead to a crash.

Signed-off-by: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Anil Gurumurthy 2015-11-26 03:54:00 -05:00 committed by Martin K. Petersen
parent 889d0d4266
commit 3c3da12d31
1 changed files with 26 additions and 0 deletions
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26
drivers/scsi/bfa/bfad_im.c
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@ -272,6 +272,19 @@ bfad_im_target_reset_send(struct bfad_s *bfad, struct scsi_cmnd *cmnd,
cmnd->host_scribble = NULL;
cmnd->SCp.Status = 0;
bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
/*
* bfa_itnim can be NULL if the port gets disconnected and the bfa
* and fcs layers have cleaned up their nexus with the targets and
* the same has not been cleaned up by the shim
*/
if (bfa_itnim == NULL) {
bfa_tskim_free(tskim);
BFA_LOG(KERN_ERR, bfad, bfa_log_level,
"target reset, bfa_itnim is NULL\n");
rc = BFA_STATUS_FAILED;
goto out;
}
memset(&scsilun, 0, sizeof(scsilun));
bfa_tskim_start(tskim, bfa_itnim, scsilun,
FCP_TM_TARGET_RESET, BFAD_TARGET_RESET_TMO);
@ -327,6 +340,19 @@ bfad_im_reset_lun_handler(struct scsi_cmnd *cmnd)
cmnd->SCp.ptr = (char *)&wq;
cmnd->SCp.Status = 0;
bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
/*
* bfa_itnim can be NULL if the port gets disconnected and the bfa
* and fcs layers have cleaned up their nexus with the targets and
* the same has not been cleaned up by the shim
*/
if (bfa_itnim == NULL) {
bfa_tskim_free(tskim);
BFA_LOG(KERN_ERR, bfad, bfa_log_level,
"lun reset, bfa_itnim is NULL\n");
spin_unlock_irqrestore(&bfad->bfad_lock, flags);
rc = FAILED;
goto out;
}
int_to_scsilun(cmnd->device->lun, &scsilun);
bfa_tskim_start(tskim, bfa_itnim, scsilun,
FCP_TM_LUN_RESET, BFAD_LUN_RESET_TMO);