Driver core: create lock/unlock functions for struct device

In the future, we are going to be changing the lock type for struct
device (once we get the lockdep infrastructure properly worked out)  To
make that changeover easier, and to possibly burry the lock in a
different part of struct device, let's create some functions to lock and
unlock a device so that no out-of-core code needs to be changed in the
future.

This patch creates the device_lock/unlock/trylock() functions, and
converts all in-tree users to them.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Dave Young <hidave.darkstar@gmail.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Phil Carmody <ext-phil.2.carmody@nokia.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Len Brown <len.brown@intel.com>
Cc: Magnus Damm <damm@igel.co.jp>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Alex Chiang <achiang@hp.com>
Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrew Patterson <andrew.patterson@hp.com>
Cc: Yu Zhao <yu.zhao@intel.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: CHENG Renquan <rqcheng@smu.edu.sg>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: Frans Pop <elendil@planet.nl>
Cc: David Vrabel <david.vrabel@csr.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 4 insertions, 4 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 712250f..26301cb 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -288,9 +288,9 @@ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
 			next = dev->bus_list.next;
 
 		/* Run device routines with the device locked */
-		down(&dev->dev.sem);
+		device_lock(&dev->dev);
 		retval = cb(dev, userdata);
-		up(&dev->dev.sem);
+		device_unlock(&dev->dev);
 		if (retval)
 			break;
 	}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 77b493b..897fa5c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2486,7 +2486,7 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
 	if (!probe) {
 		pci_block_user_cfg_access(dev);
 		/* block PM suspend, driver probe, etc. */
-		down(&dev->dev.sem);
+		device_lock(&dev->dev);
 	}
 
 	rc = pci_dev_specific_reset(dev, probe);
@@ -2508,7 +2508,7 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
 	rc = pci_parent_bus_reset(dev, probe);
 done:
 	if (!probe) {
-		up(&dev->dev.sem);
+		device_unlock(&dev->dev);
 		pci_unblock_user_cfg_access(dev);
 	}