On Fri, Dec 09, 2016 at 03:19:42PM +0100, Daniel Vetter wrote:
> Looping when we keep track of this is silly. Only thing we have to
> be careful is with sampling the connector count. To avoid inconsisten
> results due to gcc re-computing this, use READ_ONCE.
Later on in the function we take the mutex that should prevent the
values from changing.
If each block was like
mutex_lock(&mode_config->lockc);
count = dev->mode_config.num_crtc;
if (card_res->count_crtcs >= count) {
u32 __user id = u64_to_user_ptr(card_res->crtc_id_ptr);
unsigned int copied = 0;
drm_for_each_crtc(crtc, dev) {
if (copied >= count)
break;
if (put_user(crtc->base.id, id + copied)) {
ret = -EFAULT;
goto out;
}
copied++;
}
count = copied;
}
card_res->count_crtcs = count;
...
mutex_unlock(&mode_config->lockc);
it would look a bit neater.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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