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authorDavid Brownell <david-b@pacbell.net>2008-07-24 08:30:33 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 21:47:33 +0400
commit5ad31a575157147b43fa84ef1e21471661653878 (patch)
treec4a42d45957362aa8391938ae3e11496321c19d8 /drivers/rtc/rtc-dev.c
parent53f1b1433da7eac2607a4a0898a221a4485fd732 (diff)
downloadlinux-5ad31a575157147b43fa84ef1e21471661653878.tar.xz
rtc: remove BKL for ioctl()
Remove implicit use of BKL in ioctl() from the RTC framework. Instead, the rtc->ops_lock is used. That's the same lock that already protects the RTC operations when they're issued through the exported rtc_*() calls in drivers/rtc/interface.c ... making this a bugfix, not just a cleanup, since both ioctl calls and set_alarm() need to update IRQ enable flags and that implies a common lock (which RTC drivers as a rule do not provide on their own). A new comment at the declaration of "struct rtc_class_ops" summarizes current locking rules. It's not clear to me that the exceptions listed there should exist ... if not, those are pre-existing problems which can be fixed in a patch that doesn't relate to BKL removal. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Jonathan Corbet <corbet@lwn.net> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/rtc-dev.c')
-rw-r--r--drivers/rtc/rtc-dev.c58
1 files changed, 38 insertions, 20 deletions
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 0114a78b7cbb..0a870b7e5c32 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -209,7 +209,7 @@ static unsigned int rtc_dev_poll(struct file *file, poll_table *wait)
return (data != 0) ? (POLLIN | POLLRDNORM) : 0;
}
-static int rtc_dev_ioctl(struct inode *inode, struct file *file,
+static long rtc_dev_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
@@ -219,6 +219,10 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
struct rtc_wkalrm alarm;
void __user *uarg = (void __user *) arg;
+ err = mutex_lock_interruptible(&rtc->ops_lock);
+ if (err)
+ return -EBUSY;
+
/* check that the calling task has appropriate permissions
* for certain ioctls. doing this check here is useful
* to avoid duplicate code in each driver.
@@ -227,26 +231,31 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
case RTC_EPOCH_SET:
case RTC_SET_TIME:
if (!capable(CAP_SYS_TIME))
- return -EACCES;
+ err = -EACCES;
break;
case RTC_IRQP_SET:
if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
- return -EACCES;
+ err = -EACCES;
break;
case RTC_PIE_ON:
if (rtc->irq_freq > rtc->max_user_freq &&
!capable(CAP_SYS_RESOURCE))
- return -EACCES;
+ err = -EACCES;
break;
}
+ if (err)
+ goto done;
+
/* try the driver's ioctl interface */
if (ops->ioctl) {
err = ops->ioctl(rtc->dev.parent, cmd, arg);
- if (err != -ENOIOCTLCMD)
+ if (err != -ENOIOCTLCMD) {
+ mutex_unlock(&rtc->ops_lock);
return err;
+ }
}
/* if the driver does not provide the ioctl interface
@@ -265,15 +274,19 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
switch (cmd) {
case RTC_ALM_READ:
+ mutex_unlock(&rtc->ops_lock);
+
err = rtc_read_alarm(rtc, &alarm);
if (err < 0)
return err;
if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
- return -EFAULT;
- break;
+ err = -EFAULT;
+ return err;
case RTC_ALM_SET:
+ mutex_unlock(&rtc->ops_lock);
+
if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
return -EFAULT;
@@ -321,24 +334,26 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
}
}
- err = rtc_set_alarm(rtc, &alarm);
- break;
+ return rtc_set_alarm(rtc, &alarm);
case RTC_RD_TIME:
+ mutex_unlock(&rtc->ops_lock);
+
err = rtc_read_time(rtc, &tm);
if (err < 0)
return err;
if (copy_to_user(uarg, &tm, sizeof(tm)))
- return -EFAULT;
- break;
+ err = -EFAULT;
+ return err;
case RTC_SET_TIME:
+ mutex_unlock(&rtc->ops_lock);
+
if (copy_from_user(&tm, uarg, sizeof(tm)))
return -EFAULT;
- err = rtc_set_time(rtc, &tm);
- break;
+ return rtc_set_time(rtc, &tm);
case RTC_PIE_ON:
err = rtc_irq_set_state(rtc, NULL, 1);
@@ -376,34 +391,37 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
break;
#endif
case RTC_WKALM_SET:
+ mutex_unlock(&rtc->ops_lock);
if (copy_from_user(&alarm, uarg, sizeof(alarm)))
return -EFAULT;
- err = rtc_set_alarm(rtc, &alarm);
- break;
+ return rtc_set_alarm(rtc, &alarm);
case RTC_WKALM_RD:
+ mutex_unlock(&rtc->ops_lock);
err = rtc_read_alarm(rtc, &alarm);
if (err < 0)
return err;
if (copy_to_user(uarg, &alarm, sizeof(alarm)))
- return -EFAULT;
- break;
+ err = -EFAULT;
+ return err;
#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
case RTC_UIE_OFF:
clear_uie(rtc);
- return 0;
+ break;
case RTC_UIE_ON:
- return set_uie(rtc);
+ err = set_uie(rtc);
#endif
default:
err = -ENOTTY;
break;
}
+done:
+ mutex_unlock(&rtc->ops_lock);
return err;
}
@@ -432,7 +450,7 @@ static const struct file_operations rtc_dev_fops = {
.llseek = no_llseek,
.read = rtc_dev_read,
.poll = rtc_dev_poll,
- .ioctl = rtc_dev_ioctl,
+ .unlocked_ioctl = rtc_dev_ioctl,
.open = rtc_dev_open,
.release = rtc_dev_release,
.fasync = rtc_dev_fasync,