diff options
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2006-05-01 12:16:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-01 18:17:46 -0700 |
| commit | 3418ff76119da52f808eb496191d1fd380f53f3d (patch) | |
| tree | 2b705944ed950def93eda54e7f551ba36d8f41c6 | |
| parent | b44df334a7e909d88cf5c54cc0481b4e2eaeca23 (diff) | |
| download | linux-3418ff76119da52f808eb496191d1fd380f53f3d.tar.bz2 | |
[PATCH] RTC: rtc-dev tweak for 64-bit kernel
Make rtc-dev work well on 64-bit platforms with 32-bit userland. On those
platforms, users might try to read 32-bit integer value. This patch make
rtc-dev's read() work well for both "int" and "long" size. This tweak is came
from genrtc driver.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/rtc/rtc-dev.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index b1e3e6179e56..6c9ad92747fd 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -58,7 +58,7 @@ rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) unsigned long data; ssize_t ret; - if (count < sizeof(unsigned long)) + if (count != sizeof(unsigned int) && count < sizeof(unsigned long)) return -EINVAL; add_wait_queue(&rtc->irq_queue, &wait); @@ -90,11 +90,16 @@ rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) if (ret == 0) { /* Check for any data updates */ if (rtc->ops->read_callback) - data = rtc->ops->read_callback(rtc->class_dev.dev, data); - - ret = put_user(data, (unsigned long __user *)buf); - if (ret == 0) - ret = sizeof(unsigned long); + data = rtc->ops->read_callback(rtc->class_dev.dev, + data); + + if (sizeof(int) != sizeof(long) && + count == sizeof(unsigned int)) + ret = put_user(data, (unsigned int __user *)buf) ?: + sizeof(unsigned int); + else + ret = put_user(data, (unsigned long __user *)buf) ?: + sizeof(unsigned long); } return ret; } |