lkml.org 
[lkml]   [2011]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Locking in the clk API, part 2: clk_prepare/clk_unprepare
On Tue, Feb 01, 2011 at 10:05:56PM +0900, Jassi Brar wrote:
> 2011/2/1 Uwe Kleine-König <u.kleine-koenig@pengutronix.de>:
>
> .....
>
> > Do you plan to handle the case that clk_enable is called while prepare
> > isn't completed (considering the special case "not called at all")?
> > Maybe BUG_ON(clk->ops->prepare && !clk->prepare_count)?
> Sounds better than the second option.
>
> > Alternatively don't force the sleep in clk_prepare (e.g. by protecting
> > prepare_count by a spinlock (probably enable_lock)) and call clk_prepare
> > before calling clk->ops->enable?
> That might result in a driver working on some platforms(those have
> atomic clk_prepare)
> and not on others(those have sleeping).
The first option has the same result. E.g. on some platforms
clk->ops->prepare might be NULL, on others it's not.

Uwe

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-02-01 15:03    [W:0.083 / U:8.732 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site