On 3/18/25 11:40, Daniel Wagner wrote:
> The lsrsp object is maintained by the LLDD. The lifetime of the lsrsp
> object is implicit. Because there is no explicit cleanup/free call into
> the LLDD, it is not safe to assume after xml_rsp_fails, that the lsrsp
> is still valid. The LLDD could have freed the object already.
>
> With the recent changes how fcloop tracks the resources, this is the
> case. Thus don't access lsrsp after xml_rsp_fails.
>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>
> ---
> drivers/nvme/host/fc.c | 13 ++++++++++---
> 1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index b9929a5a7f4e3f3a03953379aceb90f0c1a0b561..2c32ba9ee688d7a683bbbf8fc57a5f9b32b2ab8d 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -1410,9 +1410,8 @@ nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl)
> }
>
> static void
> -nvme_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp)
> +nvme_fc_xmt_ls_rsp_free(struct nvmefc_ls_rcv_op *lsop)
> {
> - struct nvmefc_ls_rcv_op *lsop = lsrsp->nvme_fc_private;
> struct nvme_fc_rport *rport = lsop->rport;
> struct nvme_fc_lport *lport = rport->lport;
> unsigned long flags;
> @@ -1433,6 +1432,14 @@ nvme_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp)
> nvme_fc_rport_put(rport);
> }
>
> +static void
> +nvme_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp)
> +{
> + struct nvmefc_ls_rcv_op *lsop = lsrsp->nvme_fc_private;
> +
> + nvme_fc_xmt_ls_rsp_free(lsop);
> +}
> +
> static void
> nvme_fc_xmt_ls_rsp(struct nvmefc_ls_rcv_op *lsop)
> {
> @@ -1450,7 +1457,7 @@ nvme_fc_xmt_ls_rsp(struct nvmefc_ls_rcv_op *lsop)
> dev_warn(lport->dev,
> "LLDD rejected LS RSP xmt: LS %d status %d\n",
> w0->ls_cmd, ret);
> - nvme_fc_xmt_ls_rsp_done(lsop->lsrsp);
> + nvme_fc_xmt_ls_rsp_free(lsop);
> return;
> }
> }
>
Hmm. That is a weird change. 'lsop->lsrsp' clearly _was_ valid just before:
ret = lport->ops->xmt_ls_rsp(&lport->localport, &rport->remoteport,
lsop->lsrsp);
if (ret) {
dev_warn(lport->dev,
"LLDD rejected LS RSP xmt: LS %d status %d\n",
w0->ls_cmd, ret);
nvme_fc_xmt_ls_rsp_done(lsop->lsrsp);
return;
}
so ->xmt_ls_rsp() would have invalidated one of the arguments.
Plus 'nvme_fc_xmt_ls_rsp_done()' is now a wrapper around
'nvme_fc_xmt_ls_rsp_free()'.
So why not go the full length and kill nvme_fc_xmt_ls_rsp_done()
completely?
Hmm?
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich