linux-kernel - Re: [PATCH 4/5] uas: add dead request list

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Date:	Thu, 05 Sep 2013 09:26:35 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	linux-usb@...r.kernel.org, Matthew Wilcox <willy@...ux.intel.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"open list:USB ATTACHED SCSI" <linux-scsi@...r.kernel.org>,
	"open list:USB MASS STORAGE..." 
	<usb-storage@...ts.one-eyed-alien.net>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] uas: add dead request list

On Mon, 2013-09-02 at 13:25 +0200, Gerd Hoffmann wrote:
> +static void uas_zap_dead(struct uas_dev_info *devinfo)
> +{
> +       struct uas_cmd_info *cmdinfo;
> +       struct uas_cmd_info *temp;
> +       struct list_head list;
> +       unsigned long flags;
> +
> +       spin_lock_irq(&uas_lists_lock);
> +       list_replace_init(&uas_dead_list, &list);
> +       spin_unlock_irq(&uas_lists_lock);

This looks like a window for a race.

> +       spin_lock_irqsave(&devinfo->lock, flags);
> +       list_for_each_entry_safe(cmdinfo, temp, &list, dead) {
> +  

What happens if list entries are on the private list, when
the function is called for another device? It looks to me like
the di==devinfo test could put them back on the list although
they would need to be canceled.

	Regards
		Oliver


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