hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

mem: cdev lock_kernel() pushdown 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/char/mem.c
View File

@ -26,6 +26,7 @@
#include <linux/bootmem.h> #include <linux/bootmem.h>
#include <linux/splice.h> #include <linux/splice.h>
#include <linux/pfn.h> #include <linux/pfn.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/io.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) static int memory_open(struct inode * inode, struct file * filp)
{ {
int ret = 0;
lock_kernel();
switch (iminor(inode)) { switch (iminor(inode)) {
case 1: case 1:
filp->f_op = &mem_fops; filp->f_op = &mem_fops;
@ -932,11 +936,13 @@ static int memory_open(struct inode * inode, struct file * filp)
break; break;
#endif #endif
default: default:
unlock_kernel();
return -ENXIO; return -ENXIO;
} }
if (filp->f_op && filp->f_op->open) if (filp->f_op && filp->f_op->open)
return filp->f_op->open(inode,filp); ret = filp->f_op->open(inode,filp);
return 0; unlock_kernel();
return ret;
} }
static const struct file_operations memory_fops = { static const struct file_operations memory_fops = {