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| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-07-23 21:30:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 10:47:33 -0700 |
| commit | 53f1b1433da7eac2607a4a0898a221a4485fd732 (patch) | |
| tree | b6c663482bc7e94cead5d8e9135993a0af149b18 /drivers/char/rtc.c | |
| parent | 4c228db0b30fa12d65ae7461ce29ed1f4da12c5b (diff) | |
| download | lwn-53f1b1433da7eac2607a4a0898a221a4485fd732.tar.gz lwn-53f1b1433da7eac2607a4a0898a221a4485fd732.zip | |
rtc: push the BKL down into the driver ioctl method
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>
Diffstat (limited to 'drivers/char/rtc.c')
| -rw-r--r-- | drivers/char/rtc.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c index fa92a8af5a5a..d1569a0d0506 100644 --- a/drivers/char/rtc.c +++ b/drivers/char/rtc.c @@ -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, |