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Message-ID: <1452242859.27508.12.camel@haakon3.risingtidesystems.com>
Date: Fri, 08 Jan 2016 00:47:39 -0800
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: Bart Van Assche <bart.vanassche@...disk.com>
Cc: Christoph Hellwig <hch@....de>,
"Nicholas A. Bellinger" <nab@...erainc.com>,
target-devel <target-devel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
Sagi Grimberg <sagig@...lanox.com>,
Hannes Reinecke <hare@...e.de>,
Andy Grover <agrover@...hat.com>,
Vasu Dev <vasu.dev@...ux.intel.com>, Vu Pham <vu@...lanox.com>
Subject: Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during
get_initiator_node_acl
On Fri, 2016-01-08 at 09:31 +0100, Bart Van Assche wrote:
> On 01/08/2016 09:14 AM, Christoph Hellwig wrote:
> >> mutex_lock(&tpg->acl_node_mutex);
> >> acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
> >> + /*
> >> + * Obtain the acl_kref now, which will be dropped upon the
> >> + * release of se_sess memory within transport_free_session().
> >> + */
> >> + if (acl)
> >> + kref_get(&acl->acl_kref);
> >
> > І think the comment is highly confusing as it's about one of the
> > callers, while the function has many.
> >
> > I'd suggest you move it to core_tpg_check_initiator_node_acl instead.
> >
> > Also I think iscsit_build_sendtargets_response will need a put on
> > the nacl, otherwise you'll leak references.
>
> Indeed. All error paths in all target drivers will have to be modified
> to avoid that an acl reference leak is triggered if
> transport_init_session() fails after core_tpg_check_initiator_node_acl()
> succeeded.
>
Actually no, they do not. That's the way that everything outside of
tcm_fc + ib_srpt driver code has already worked for a long time.
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