From: Diego Woitasen <diego@woitasen.com.ar>
Date: Wed, 21 Nov 2007 23:07:08 +0000 (-0800)
Subject: PCI: remove unneeded lock_kernel() in drivers/pci/syscall.c.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=0741a951e8489ef2889d9e3eecf33bb29b779dd0;p=openwrt%2Fstaging%2Fblogic.git

PCI: remove unneeded lock_kernel() in drivers/pci/syscall.c.

sys_pciconfig_{read,write}() are protected against PCI removal with the
reference count in struct pci_dev.  The concurrency of
pci_user_{read,write}_config_* functions are already protected by pci_lock
in drivers/pci/access.c.

Signed-off-by: Diego Woitasen <diego@woitasen.com.ar>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c
index 2ac050d7f8cf..645d7a60e412 100644
--- a/drivers/pci/syscall.c
+++ b/drivers/pci/syscall.c
@@ -34,7 +34,6 @@ sys_pciconfig_read(unsigned long bus, unsigned long dfn,
 	if (!dev)
 		goto error;
 
-	lock_kernel();
 	switch (len) {
 	case 1:
 		cfg_ret = pci_user_read_config_byte(dev, off, &byte);
@@ -47,10 +46,8 @@ sys_pciconfig_read(unsigned long bus, unsigned long dfn,
 		break;
 	default:
 		err = -EINVAL;
-		unlock_kernel();
 		goto error;
 	};
-	unlock_kernel();
 
 	err = -EIO;
 	if (cfg_ret != PCIBIOS_SUCCESSFUL)
@@ -107,7 +104,6 @@ sys_pciconfig_write(unsigned long bus, unsigned long dfn,
 	if (!dev)
 		return -ENODEV;
 
-	lock_kernel();
 	switch(len) {
 	case 1:
 		err = get_user(byte, (u8 __user *)buf);
@@ -140,7 +136,6 @@ sys_pciconfig_write(unsigned long bus, unsigned long dfn,
 		err = -EINVAL;
 		break;
 	}
-	unlock_kernel();
 	pci_dev_put(dev);
 	return err;
 }