linux-kernel - Re: [RFC-v2 11/12] iscsi-target: Add misc utility and debug logic

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Date:	Tue, 15 Mar 2011 11:27:20 +0100
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Christoph Hellwig <hch@....de>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Douglas Gilbert <dgilbert@...erlog.com>
Subject: Re: [RFC-v2 11/12] iscsi-target: Add misc utility and debug logic

On Mon, Mar 14, 2011 at 04:57:08AM -0700, Nicholas A. Bellinger wrote:
> +++ b/drivers/target/iscsi/iscsi_debug.h
> @@ -0,0 +1,113 @@
> +#ifndef ISCSI_DEBUG_H
> +#define ISCSI_DEBUG_H
> +
> +/*
> + * Debugging Support
> + */
> +
> +#define TRACE_DEBUG	0x00000001	/* Verbose debugging */
> +#define TRACE_SCSI	0x00000002	/* Stuff related to SCSI Mid-layer */

Please use trace events for this kind of debugging.

> +	spin_lock_bh(&conn->cmd_lock);
> +	list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
> +	spin_unlock_bh(&conn->cmd_lock);
> +
> +	atomic_inc(&conn->active_cmds);

Seems like this counter is always maintained together with the list,
so it should be a non-atomic type under cmd_lock.

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