From: Atsushi Nemoto Date: Mon, 1 May 2006 19:16:17 +0000 (-0700) Subject: [PATCH] genrtc: fix read on 64-bit platforms X-Git-Tag: v2.6.17-rc4~67 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=f3537ea7b9c2f10397a8b68cd006981d7c615431;p=linux-2.6-omap-h63xx.git [PATCH] genrtc: fix read on 64-bit platforms Fix genrtc's read() routine for 64-bit platforms. Current gen_rtc_read() stores 64bit integer and returns 8 even if an user tried to read a 32bit integer. Signed-off-by: Atsushi Nemoto Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c index d3a2bc36129..588fca542a9 100644 --- a/drivers/char/genrtc.c +++ b/drivers/char/genrtc.c @@ -200,13 +200,13 @@ static ssize_t gen_rtc_read(struct file *file, char __user *buf, /* first test allows optimizer to nuke this case for 32-bit machines */ if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) { unsigned int uidata = data; - retval = put_user(uidata, (unsigned long __user *)buf); + retval = put_user(uidata, (unsigned int __user *)buf) ?: + sizeof(unsigned int); } else { - retval = put_user(data, (unsigned long __user *)buf); + retval = put_user(data, (unsigned long __user *)buf) ?: + sizeof(unsigned long); } - if (!retval) - retval = sizeof(unsigned long); out: current->state = TASK_RUNNING; remove_wait_queue(&gen_rtc_wait, &wait);