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 2ac050d..645d7a6 100644 (file)
--- 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;
 }