[PATCH v3 07/10] clk: rollback set_rate_range changes on failure

[jbrunet@baylibre.com (Jerome Brunet)]

On Tue, 2017-07-11 at 19:02 -0700, Stephen Boyd wrote:
> On 06/12, Jerome Brunet wrote:
> > Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
> 
> There should be some commit text here describing the problem.
> Also a Fixes: tag and please put this earlier in the series.

Fixes added but as explained, I dropped this patch after thinking about Peter's
observations.

The new candidate patch would be [0]. I suggest we discuss this out of the clock
 protect thread to avoid mixing issues.

[0]: https://github.com/jeromebrunet/linux/commit/235e477f346a9e8d115dda257f9f73
834151bd7f


> 
> > ---
> > ?drivers/clk/clk.c | 8 ++++++++
> > ?1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> > index d91236e70a04..253f1d3f0971 100644
> > --- a/drivers/clk/clk.c
> > +++ b/drivers/clk/clk.c
> > @@ -1864,6 +1864,7 @@ EXPORT_SYMBOL_GPL(clk_set_rate_protect);
> > ?int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long
> > max)
> > ?{
> > ?	int ret = 0;
> > +	unsigned int old_min, old_max;
> > ?
> > ?	if (!clk)
> > ?		return 0;
> > @@ -1881,9 +1882,16 @@ int clk_set_rate_range(struct clk *clk, unsigned long
> > min, unsigned long max)
> > ?		clk_core_rate_unprotect(clk->core);
> > ?
> > ?	if (min != clk->min_rate || max != clk->max_rate) {
> > +		old_min = clk->min_rate;
> > +		old_max = clk->max_rate;
> > ?		clk->min_rate = min;
> > ?		clk->max_rate = max;
> > ?		ret = clk_core_set_rate_nolock(clk->core, clk->core-
> > >req_rate);
> > +		if (ret) {
> > +			/* undo changes */
> > +			clk->min_rate = old_min;
> > +			clk->max_rate = old_max;
> > +		}
> > ?	}
> > ?
> > ?	if (clk->protect_count)
> 
>