PCI: kill BKL in /proc/pci

All operations in the pci procfs ioctl functions are
atomic, so no lock is needed here.

Also add a compat_ioctl method, since all the commands
are compatible in 32 bit mode.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/proc.c

@@ -212,8 +212,6 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 #endif /* HAVE_PCI_MMAP */
 	int ret = 0;
 
-	lock_kernel();
-
 	switch (cmd) {
 	case PCIIOC_CONTROLLER:
 		ret = pci_domain_nr(dev->bus);
@@ -242,7 +240,6 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 		break;
 	};
 
-	unlock_kernel();
 	return ret;
 }
 
@@ -306,6 +303,7 @@ static const struct file_operations proc_bus_pci_operations = {
 	.read		= proc_bus_pci_read,
 	.write		= proc_bus_pci_write,
 	.unlocked_ioctl	= proc_bus_pci_ioctl,
+	.compat_ioctl	= proc_bus_pci_ioctl,
 #ifdef HAVE_PCI_MMAP
 	.open		= proc_bus_pci_open,
 	.release	= proc_bus_pci_release,