On Sun, Feb 12, 2017 at 08:07:13PM +0000, Bart Van Assche wrote:
> On Sun, 2017-02-12 at 19:05 +0200, Leon Romanovsky wrote:
> > On Fri, Feb 10, 2017 at 03:56:04PM -0800, Bart Van Assche wrote:
> > > diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
> > > index 79bf48477ddb..4068d34f5427 100644
> > > --- a/drivers/infiniband/ulp/srp/ib_srp.c
> > > +++ b/drivers/infiniband/ulp/srp/ib_srp.c
> > > @@ -1899,7 +1899,14 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
> > > scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
> > > if (scmnd) {
> > > req = (void *)scmnd->host_scribble;
> > > - scmnd = srp_claim_req(ch, req, NULL, scmnd);
> > > + if (req) {
> > > + scmnd = srp_claim_req(ch, req, NULL, scmnd);
> > > + } else {
> > > + shost_printk(KERN_ERR, target->scsi_host,
> > > + "NULL host_scribble for response with tag %#llx\n",
> > > + rsp->tag);
> > > + scmnd = NULL;
> > > + }
> > > }
> > > if (!scmnd) {
> > > shost_printk(KERN_ERR, target->scsi_host,
> >
> > You have the chance to print the message below together with your new
> > print, because scmd will be NULL.
> >
> > What about to do the following check "if (scmd && scmd->host_scribble)"
> > instead of your proposed patch?
>
> That approach would still trigger a kernel oops if a duplicate response is
> received because the second argument of srp_claim_req() must not be NULL.
I'm sure that I'm missing something, but how would it be triggered?
We will enter to call second srp_claim_req() function only if "req" is
not NULL.
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 79bf48477ddb..40e7f27c40bf 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1897,10 +1897,12 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
complete(&ch->tsk_mgmt_done);
} else {
scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
- if (scmnd) {
+ if (scmnd && scmnd->host_scribble) {
req = (void *)scmnd->host_scribble;
scmnd = srp_claim_req(ch, req, NULL, scmnd);
}
+ else
+ scnmnd = NULL;
if (!scmnd) {
shost_printk(KERN_ERR, target->scsi_host,
"Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\n",
>
> Bart.
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