linux-kernel - Re: [PATCH V2] ALS: TSL2550 driver move from i2c/chips

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Date:	Sat, 17 Oct 2009 19:07:20 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Rodolfo Giometti <giometti@...eenne.com>,
	"Michele De Candia (VT)" <michele.decandia@...ueteam.com>,
	Linux I2C <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH V2] ALS: TSL2550 driver move from i2c/chips

On Sat, Oct 17, 2009 at 05:56:48PM +0100, Jonathan Cameron wrote:
> +static int tsl2550_get_id(void)
> +{
> +	int ret, val;
> +
> +idr_again:
> +	if (unlikely(idr_pre_get(&tsl2550_idr, GFP_KERNEL) == 0))
> +		return -ENOMEM;
> +	spin_lock(&tsl2550_idr_lock);
> +	ret = idr_get_new(&tsl2550_idr, NULL, &val);
> +	if (unlikely(ret == -EAGAIN))
> +		goto idr_again;



That looks like a fair chance to produce a deadlock
by reacquiring the above spinlock.

Also I never see the above lock released later from this
function or its caller.

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