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>

1 files changed, 0 insertions, 5 deletions

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;
 }