[S390] vmcp: remove BKL

The vmcp driver uses the session->mutex for concurrent access of the data
structures. Therefore, the BKL in vmcp_open does not protect against any
other function in the driver.
The BLK in vmcp_open would protect concurrent access to the module init
but all necessary steps ave finished before misc_register is called.
We can safely remove the lock_kernel from vcmp.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 09e7d9bf438b..d7083b33b0fe 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -16,7 +16,6 @@
 #include <linux/kernel.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
-#include <linux/smp_lock.h>
 #include <asm/cpcmd.h>
 #include <asm/debug.h>
 #include <asm/uaccess.h>
@@ -41,13 +40,11 @@ static int vmcp_open(struct inode *inode, struct file *file)
         if (!session)
                 return -ENOMEM;
 
-        lock_kernel();
         session->bufsize = PAGE_SIZE;
         session->response = NULL;
         session->resp_size = 0;
         mutex_init(&session->mutex);
         file->private_data = session;
-        unlock_kernel();
         return nonseekable_open(inode, file);
 }