On Thu, Nov 12, 2020 at 10:25:48AM -0800, Bart Van Assche wrote:
> On 11/12/20 9:20 AM, Jason Gunthorpe wrote:
> > I think it should be like this, Bart?
> >
> > diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
> > index 6017d525084a0c..80f9673956ced2 100644
> > +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
> > @@ -2311,7 +2311,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
> > mutex_lock(&sport->port_guid_id.mutex);
> > list_for_each_entry(stpg, &sport->port_guid_id.tpg_list, entry) {
> > - if (!IS_ERR_OR_NULL(ch->sess))
> > + if (ch->sess)
> > break;
> > ch->sess = target_setup_session(&stpg->tpg, tag_num,
> > tag_size, TARGET_PROT_NORMAL,
> > @@ -2321,12 +2321,12 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
> > mutex_lock(&sport->port_gid_id.mutex);
> > list_for_each_entry(stpg, &sport->port_gid_id.tpg_list, entry) {
> > - if (!IS_ERR_OR_NULL(ch->sess))
> > + if (ch->sess)
> > break;
> > ch->sess = target_setup_session(&stpg->tpg, tag_num,
> > tag_size, TARGET_PROT_NORMAL, i_port_id,
> > ch, NULL);
> > - if (!IS_ERR_OR_NULL(ch->sess))
> > + if (ch->sess)
> > break;
> > /* Retry without leading "0x" */
> > ch->sess = target_setup_session(&stpg->tpg, tag_num,
> > @@ -2335,7 +2335,9 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
> > }
> > mutex_unlock(&sport->port_gid_id.mutex);
> > - if (IS_ERR_OR_NULL(ch->sess)) {
> > + if (!ch->sess)
> > + ch->sess = ERR_PTR(-ENOENT);
> > + if (IS_ERR(ch->sess)) {
> > WARN_ON_ONCE(ch->sess == NULL);
> > ret = PTR_ERR(ch->sess);
> > ch->sess = NULL;
> >
>
> Hi Jason,
>
> The ib_srpt driver accepts three different formats for the initiator ACL. Up
> to two of the three target_setup_session() calls will fail if the fifth
> argument of target_setup_session() does not use the format of the initiator
> ID in configfs. If the first or the second target_setup_session() call fails
> it is essential that later target_setup_session() calls happen. Hence the
> IS_ERR_OR_NULL(ch->sess) checks in the above loops.
IS_ERR_OR_NULL is an abomination, it should not be used.
I see I didn't quite get it right, but that is still closer to sane,
probably target_setup_session() should return NULL not err_ptr
Jason
