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From: Chris Wright <chrisw@osdl.org>
To: Brian King <brking@us.ibm.com>
Cc: Greg KH <greg@kroah.com>, Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] call_usermodehelper hang
Date: Thu, 8 Apr 2004 16:17:07 -0700	[thread overview]
Message-ID: <20040408161707.J22989@build.pdx.osdl.net> (raw)
In-Reply-To: <407487A6.8020904@us.ibm.com>; from brking@us.ibm.com on Wed, Apr 07, 2004 at 05:58:46PM -0500

* Brian King (brking@us.ibm.com) wrote:
> The following patch fixes a deadlock experienced when devices are
> being added to a bus both from a user process and eventd process.
> The eventd process was hung waiting on dev->bus->subsys.rwsem which
> was held by another process, which was hung since it was calling 
> call_usermodehelper directly which was hung waiting for work scheduled
> on the eventd workqueue to complete. The patch fixes this by delaying
> the kobject_hotplug work, running it from eventd if possible. 

Couple of gratuitous formatting changes.

> -	   failure, no hotplug event is required. */
> +	 failure, no hotplug event is required. */

here

> -				  &envp[i], NUM_ENVP - i, scratch,
> -				  BUFFER_SIZE - (scratch - buffer));
> +						     &envp[i], NUM_ENVP - i, scratch,
> +						     BUFFER_SIZE - (scratch - buffer));

and here.

Overall, why does it seem to just be pushing the problem around?
Similarly, if you did your work in a child of keventd the problem would
move away.

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net

  parent reply	other threads:[~2004-04-08 23:17 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-06 18:11 call_usermodehelper hang Brian King
2004-04-07  0:29 ` Andrew Morton
2004-04-07  6:11   ` Greg KH
2004-04-07 14:00     ` Brian King
2004-04-07 22:58     ` [PATCH] " Brian King
2004-04-08 22:47       ` Greg KH
2004-04-09 20:42         ` Brian King
2004-04-09 20:53           ` Greg KH
2004-04-09 21:05             ` Brian King
2004-04-09 21:15             ` Andrew Morton
2004-04-10 16:53               ` Greg KH
2004-04-10 20:11                 ` Andrew Morton
2004-04-12 15:25                   ` Brian King
2004-04-12 17:46                     ` Andrew Morton
2004-04-16 17:55                       ` Brian King
2004-04-12 18:49                   ` Greg KH
2004-04-08 23:17       ` Chris Wright [this message]
2004-04-07  0:41 ` Chris Wright
2004-04-07  1:46   ` Brian King

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