netdev - RE: [PATCH] [net][bna] Fix call trace when interrupts are disabled while sleeping function kzalloc is called

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Message-ID: <DBFB1B45AF80394ABD1C807E9F28D1570453626FF1@BLRX7MCDC203.AMER.DELL.COM>
Date:	Tue, 28 Jun 2011 09:32:56 -0700
From:	<Shyam_Iyer@...l.com>
To:	<rmody@...cade.com>, <shyam.iyer.t@...il.com>,
	<netdev@...r.kernel.org>
CC:	<ddutt@...cade.com>, <huangj@...cade.COM>
Subject: RE: [PATCH] [net][bna] Fix call trace when interrupts are disabled
 while sleeping function  kzalloc is called

(Resending the reply for this as well.)

> -----Original Message-----
> From: Rasesh Mody [mailto:rmody@...cade.com]
> Sent: Monday, June 27, 2011 8:51 PM
> To: Shyam Iyer; netdev@...r.kernel.org
> Cc: ddutt@...cadel.com; Iyer, Shyam; Jing Huang
> Subject: RE: [PATCH] [net][bna] Fix call trace when interrupts are
> disabled while sleeping function kzalloc is called
> 
> 
> >From: Shyam Iyer [mailto:shyam.iyer.t@...il.com]
> >Sent: Monday, June 27, 2011 1:22 PM
> >Subject: [PATCH] [net][bna] Fix call trace when interrupts are
> disabled
> >while sleeping function kzalloc is called
> >
> >The kzalloc sleeps and disabling interrupts(spin_lock_irqsave) causes
> >oops like the one.
> 
> Hi Shyam,
> 
> We are not calling any sleeping function while holding the lock in
> bnad_mbox_irq_alloc(). How would your patch fix the call trace? Also
> can you tell which conditions led to this trace.
> 
> Thanks,
> --Rasesh

Hi Rasesh,

Please review my reply/patch2 to Dave. I guess the condition to reproduce is to simply insmod/modprobe the driver on the Brocade 1020 CNA . I don't have cables attached to the card if that helps.

Thanks,
Shyam
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