There is a race condition with the abort handler declaring a waitq item on it's stack, followed by a timeout in the abort handler that has it give up on the abort return to its caller. When the io is finally aborted and its completion handler called, it references the waitq element that the abort_handler set up, which is no longer valid resulting in a deadlock.
Fix by clearing the waitq reference, under lock, when the abort handler timeout gives up. Have the completion handler validate the waitq before referencing it. Signed-off-by: Dick Kennedy <[email protected]> Signed-off-by: James Smart <[email protected]> --- drivers/scsi/lpfc/lpfc_scsi.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index 3873d5b97bc6..5a5a9bbe6023 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -3879,10 +3879,8 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn, */ spin_lock(&lpfc_cmd->buf_lock); lpfc_cmd->cur_iocbq.iocb_flag &= ~LPFC_DRIVER_ABORTED; - if (lpfc_cmd->waitq) { + if (lpfc_cmd->waitq) wake_up(lpfc_cmd->waitq); - lpfc_cmd->waitq = NULL; - } spin_unlock(&lpfc_cmd->buf_lock); lpfc_release_scsi_buf(phba, lpfc_cmd); @@ -4718,6 +4716,9 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) iocb->sli4_xritag, ret, cmnd->device->id, cmnd->device->lun); } + + lpfc_cmd->waitq = NULL; + spin_unlock(&lpfc_cmd->buf_lock); goto out; -- 2.13.7
