On 5/18/07, Andrew Morton <[email protected]> wrote:
On Fri, 18 May 2007 22:34:53 +0200 (CEST)
Jiri Slaby <[email protected]> wrote:
> @@ -118,7 +125,9 @@ static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd,
> if (r.reg > 7)
> return -EINVAL;
>
> + spin_lock(&dev->ioctl_lock);
> r.value = ioread32(dev->iaddr + r.reg);
> + spin_unlock(&dev->ioctl_lock);
What is that locking protecting in here?
Well, what led me to do it is that I didn't know how much atomic are
ioread and iowrite. If concurrent process writes something to the
place in that space while the other one is reading it, doesn't matter,
correct?
thanks,
--
http://www.fi.muni.cz/~xslaby/ Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E
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