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mbcs: cdev lock_kernel() pushdown 

This driver would appear to have no internal locking at all.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-15 11:24:23 -06:00
parent 2d863e92ec
commit 12ead6b098
1 changed files with 5 additions and 0 deletions
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5
drivers/char/mbcs.c
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@ -24,6 +24,7 @@
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/mutex.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@ -382,15 +383,19 @@ static int mbcs_open(struct inode *ip, struct file *fp)
struct mbcs_soft *soft;
int minor;
lock_kernel();
minor = iminor(ip);
/* Nothing protects access to this list... */
list_for_each_entry(soft, &soft_list, list) {
if (soft->nasid == minor) {
fp->private_data = soft->cxdev;
unlock_kernel();
return 0;
}
}
unlock_kernel();
return -ENODEV;
}