From 3418ff76119da52f808eb496191d1fd380f53f3d Mon Sep 17 00:00:00 2001 From: Atsushi Nemoto Date: Mon, 1 May 2006 12:16:16 -0700 Subject: [PATCH] [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 Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-dev.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index b1e3e6179e5..6c9ad92747f 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; } -- 2.20.1