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scsi: lpfc: Fix list corruption detected in lpfc_put_sgl_per_hdwq 

In lpfc_release_io_buf, an lpfc_io_buf is returned to the 'available' pool
before any associated sgl or cmd and rsp buffers are returned via their
respective 'put' routines.  If xri rebalancing occurs and an lpfc_io_buf
structure is reused quickly, there may be a race condition between release
of old and association of new resources.

Re-ordered lpfc_release_io_buf to release sgl and cmd/rsp
buffer lists before releasing the lpfc_io_buf structure for re-use.

Fixes: d79c9e9d4b ("scsi: lpfc: Support dynamic unbounded SGL lists on G7 hardware.")
Link: https://lore.kernel.org/r/20190922035906.10977-17-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2019-09-21 20:59:02 -07:00 committed by Martin K. Petersen
parent a4c21acca2
commit 35a635af54
1 changed files with 7 additions and 7 deletions
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14
drivers/scsi/lpfc/lpfc_sli.c
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@ -20138,6 +20138,13 @@ void lpfc_release_io_buf(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_ncmd,
lpfc_ncmd->cur_iocbq.wqe_cmpl = NULL;
lpfc_ncmd->cur_iocbq.iocb_cmpl = NULL;
if (phba->cfg_xpsgl && !phba->nvmet_support &&
!list_empty(&lpfc_ncmd->dma_sgl_xtra_list))
lpfc_put_sgl_per_hdwq(phba, lpfc_ncmd);
if (!list_empty(&lpfc_ncmd->dma_cmd_rsp_list))
lpfc_put_cmd_rsp_buf_per_hdwq(phba, lpfc_ncmd);
if (phba->cfg_xri_rebalancing) {
if (lpfc_ncmd->expedite) {
/* Return to expedite pool */
@ -20202,13 +20209,6 @@ void lpfc_release_io_buf(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_ncmd,
spin_unlock_irqrestore(&qp->io_buf_list_put_lock,
iflag);
}
if (phba->cfg_xpsgl && !phba->nvmet_support &&
!list_empty(&lpfc_ncmd->dma_sgl_xtra_list))
lpfc_put_sgl_per_hdwq(phba, lpfc_ncmd);
if (!list_empty(&lpfc_ncmd->dma_cmd_rsp_list))
lpfc_put_cmd_rsp_buf_per_hdwq(phba, lpfc_ncmd);
}
/**