linux-kernel - Re: [PATCH-v2 4/4] target: Obtain se_node_acl->acl_kref during get_initiator_node

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Message-ID: <20160112150941.GC2058@lst.de>
Date:	Tue, 12 Jan 2016 16:09:41 +0100
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...erainc.com>
Cc:	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>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Andy Grover <agrover@...hat.com>,
	Vasu Dev <vasu.dev@...ux.intel.com>, Vu Pham <vu@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH-v2 4/4] target: Obtain se_node_acl->acl_kref during
	get_initiator_node_acl

> +++ b/drivers/target/target_core_tpg.c
> @@ -75,9 +75,16 @@ struct se_node_acl *core_tpg_get_initiator_node_acl(
>  	unsigned char *initiatorname)
>  {
>  	struct se_node_acl *acl;
> -
> +	/*
> +	 * Obtain the acl_kref now, which will be dropped upon the
> +	 * release of se_sess memory within transport_free_session().
> +	 */

As said before this is incorrect, or rather shold be incorrect.  I
think it should be removed, but if you want to keep it should be
in core_tpg_check_initiator_node_acl and not here.

The call of core_tpg_get_initiator_node_acl in
iscsit_build_sendtargets_response needs a put to balance out the
get of this kref while we're at it.