linux-kernel - Re: use of preempt_count instead of in

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Date:	Fri, 21 Mar 2008 10:04:04 -0700
From:	David Brownell <david-b@...bell.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Richard Purdie <rpurdie@...ys.net>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	netdev@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-usb@...r.kernel.org, linux-wireless@...r.kernel.org,
	video4linux-list@...hat.com,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	lm-sensors@...sensors.org
Subject: Re: use of preempt_count instead of in_atomic() at leds-gpio.c

On Thursday 20 March 2008, Andrew Morton wrote:
> ./drivers/net/usb/pegasus.c
> 
>   Possibly buggy: deadlockable (I assume)

Looks just unecessary to me ... ethtool MII ops get called from
a task context, as I recall, and other drivers just rely on that.

- Dave

========= CUT HERE
Remove superfluous in-atomic() check; ethtool MII ops are called
from task context.

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
 drivers/net/usb/pegasus.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- g26.orig/drivers/net/usb/pegasus.c	2008-03-21 08:53:28.000000000 -0700
+++ g26/drivers/net/usb/pegasus.c	2008-03-21 08:54:07.000000000 -0700
@@ -1128,12 +1128,8 @@ pegasus_get_settings(struct net_device *
 {
 	pegasus_t *pegasus;
 
-	if (in_atomic())
-		return 0;
-
 	pegasus = netdev_priv(dev);
 	mii_ethtool_gset(&pegasus->mii, ecmd);
-
 	return 0;
 }
 

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