linux-kernel - Re: [PATCH 05/12] target: Convert transport_lookup_*

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150513055550.GD20825@lst.de>
Date:	Wed, 13 May 2015 07:55:50 +0200
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>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagig@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 05/12] target: Convert transport_lookup_*_lun to RCU
	reader

> +	rcu_read_lock();
> +	deve = target_nacl_find_deve(nacl, unpacked_lun);
> +	if (deve && deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
> +		/*
> +		 * Make sure that target_enable_device_list_for_node()
> +		 * has not already cleared the RCU protected pointers.
> +		 */
> +		if (!deve->se_lun) {

Just move the hlist_del_rcu in core_disable_device_list_for_node before
clearing se_lun and this check won't be needed.

And if you need ny check here just add it to the if so that there is
no need for the goto.  Same for the TMR path.

As for the locking changes:  I'd rather have the change to a mutex
as a separate patch as that's different from the data structure
changes.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/