linux-kernel - Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked

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Date:	Tue, 8 Jan 2008 13:21:00 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Paolo Ciarrocchi <paolo.ciarrocchi@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, gorcunov@...il.com
Subject: Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

On Tue, Jan 08, 2008 at 01:16:06PM -0700, Matthew Wilcox wrote:
> On Tue, Jan 08, 2008 at 09:03:13PM +0100, Paolo Ciarrocchi wrote:
> > Yes of course, I've been silly in didn't verify whether the file compile
> > but I would appreciate to know whether I'm on the right track or not.
> 
> Well ... you're not.

Here's what a correct conversion might look like.  I haven't tried to
compile it, so I'm copying and pasting it in order to damage whitespace
and make sure nobody tries to compile it.

index bf1075e..0c543a8 100644
--- a/arch/arm/common/rtctime.c
+++ b/arch/arm/common/rtctime.c
@@ -174,8 +174,7 @@ static unsigned int rtc_poll(struct file *file, poll_table *
        return data != 0 ? POLLIN | POLLRDNORM : 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)
 {
        struct rtc_ops *ops = file->private_data;
        struct rtc_time tm;
@@ -183,6 +182,8 @@ static int rtc_ioctl(struct inode *inode, struct file *file,
        void __user *uarg = (void __user *)arg;
        int ret = -EINVAL;
 
+       lock_kernel();
+
        switch (cmd) {
        case RTC_ALM_READ:
                ret = rtc_arm_read_alarm(ops, &alrm);
@@ -277,6 +278,9 @@ static int rtc_ioctl(struct inode *inode, struct file *file,
                        ret = ops->ioctl(cmd, arg);
                break;
        }
+
+       unlock_kernel();
+
        return ret;
 }
 
@@ -334,7 +338,7 @@ static const struct file_operations rtc_fops = {
        .llseek         = no_llseek,
        .read           = rtc_read,
        .poll           = rtc_poll,
-       .ioctl          = rtc_ioctl,
+       .unlocked_ioctl = rtc_ioctl,
        .open           = rtc_open,
        .release        = rtc_release,
        .fasync         = rtc_fasync,


-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
--
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