linux-kernel - Re: [regression] Latest git has WARN

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Message-Id: <200810031825.44706.borntraeger@de.ibm.com>
Date:	Fri, 3 Oct 2008 18:25:44 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [regression] Latest git has WARN_ON storm with e1000e driver

This patch seems to fix it. Comments?

kernel_init uses lock_kernel to serialize the initialization. If the driver
is compiled into the kernel, the probe function of e1000e is called under 
this lock and therefore the WARN_ON(preempt_count()) triggers. We can now 
1. remove this WARN_ON
2. check for SYSTEM_RUNNING

This patch implements 2.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 0b6095b..cca9731 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -396,7 +396,7 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
 	u32 extcnf_ctrl;
 	u32 timeout = PHY_CFG_TIMEOUT;
 
-	WARN_ON(preempt_count());
+	WARN_ON(system_state == SYSTEM_RUNNING && preempt_count());
 
 	if (!mutex_trylock(&nvm_mutex)) {
 		WARN(1, KERN_ERR "e1000e mutex contention. Owned by pid %d\n",
--
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