AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

rtc: push the BKL down into the driver ioctl method

Browse Source 
For now just wrap the main logic, but this driver is a prime candidate for
someone wanting to eliminate the lock entirely

[lizf@cn.fujitsu.com: fix build failure]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-07-23 21:30:32 -07:00 committed by Linus Torvalds
parent 4c228db0b3
commit 53f1b1433d
1 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/char/rtc.c
View File

@ -78,9 +78,10 @@
#include <linux/wait.h>
#include <linux/bcd.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
#include <linux/uaccess.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#ifdef CONFIG_X86
@ -144,8 +145,7 @@ static DEFINE_TIMER(rtc_irq_timer, rtc_dropped_irq, 0, 0);
static ssize_t rtc_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos);
static int rtc_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef RTC_IRQ
static unsigned int rtc_poll(struct file *file, poll_table *wait);
@ -719,10 +719,13 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
&wtime, sizeof wtime) ? -EFAULT : 0;
}
static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return rtc_do_ioctl(cmd, arg, 0);
long ret;
lock_kernel();
ret = rtc_do_ioctl(cmd, arg, 0);
unlock_kernel();
return ret;
}
/*
@ -915,7 +918,7 @@ static const struct file_operations rtc_fops = {
#ifdef RTC_IRQ
.poll = rtc_poll,
#endif
.ioctl = rtc_ioctl,
.unlocked_ioctl = rtc_ioctl,
.open = rtc_open,
.release = rtc_release,
.fasync = rtc_fasync,