linux-kernel - [PATCH 06/10] pci: Use __wake_up_all_locked pci_unblock_user_cfg

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Date:	Fri, 02 Dec 2011 20:46:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>, stable-rt@...r.kernel.org
Subject: [PATCH 06/10] pci: Use __wake_up_all_locked pci_unblock_user_cfg_access()

From: Thomas Gleixner <tglx@...utronix.de>

The waitqueue is protected by the pci_lock, so we can just avoid to
lock the waitqueue lock itself. That prevents the
might_sleep()/scheduling while atomic problem on RT

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable-rt@...r.kernel.org
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 drivers/pci/access.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index fdaa42a..1a6cc67 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -441,7 +441,7 @@ void pci_unblock_user_cfg_access(struct pci_dev *dev)
 	WARN_ON(!dev->block_ucfg_access);
 
 	dev->block_ucfg_access = 0;
-	wake_up_all(&pci_ucfg_wait);
+	wake_up_all_locked(&pci_ucfg_wait);
 	raw_spin_unlock_irqrestore(&pci_lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_unblock_user_cfg_access);
-- 
1.7.7.1



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