AcoSail/kernel_optimize_test
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mem: cdev lock_kernel() pushdown

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It's really hard to tell if this is necessary - lots of weird
magic happens by way of map_devmem()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-15 11:04:19 -06:00
parent ecc38983f6
commit 1f439647a4
1 changed files with 8 additions and 2 deletions
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10
drivers/char/mem.c
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@ -26,6 +26,7 @@
#include <linux/bootmem.h>
#include <linux/splice.h>
#include <linux/pfn.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -889,6 +890,9 @@ static const struct file_operations kmsg_fops = {
static int memory_open(struct inode * inode, struct file * filp)
{
int ret = 0;
lock_kernel();
switch (iminor(inode)) {
case 1:
filp->f_op = &mem_fops;
@ -932,11 +936,13 @@ static int memory_open(struct inode * inode, struct file * filp)
break;
#endif
default:
unlock_kernel();
return -ENXIO;
}
if (filp->f_op && filp->f_op->open)
return filp->f_op->open(inode,filp);
return 0;
ret = filp->f_op->open(inode,filp);
unlock_kernel();
return ret;
}
static const struct file_operations memory_fops = {