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[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>
This commit is contained in:
Christian Borntraeger 2008-12-25 13:38:34 +01:00 committed by Martin Schwidefsky
parent f414f5f153
commit a114a9d69d
1 changed files with 0 additions and 3 deletions
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3
drivers/s390/char/vmcp.c
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@ -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);
}