linux-kernel - Re: [PATCH] clk: divider: Fix table round up function

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Message-ID: <CAOMZO5C9iqLj34mJdztqZsyLNR6oHztyN2GxDY0ORp+0xU1+LA@mail.gmail.com>
Date:	Thu, 15 May 2014 10:28:46 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Maxime COQUELIN <maxime.coquelin@...com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: divider: Fix table round up function

Hi Mike,

On Wed, May 7, 2014 at 1:48 PM, Maxime COQUELIN <maxime.coquelin@...com> wrote:
> Commit 1d9fe6b97 ("clk: divider: Fix best div calculation for power-of-two and
> table dividers") introduces a regression in its _table_round_up function.
>
> When the divider passed to this function is greater than the max divider
> available in the table, this function returns table's max divider.
> Problem is that it causes an infinite loop in clk_divider_bestdiv() because
> _next_div() will never return a value greater than maxdiv.
>
> Instead of returning table's max divider, this patch returns INT_MAX.
>
> Reported-by: Fabio Estevam <festevam@...il.com>
> Reported-by: Shawn Guo <shawn.guo@...escale.com>
> Tested-by: Fabio Estevam <festevam@...il.com>
> Cc: Mike Turquette <mike.turquette@...aro.org>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@...com>

Any comments on this one? It does fix a regression.
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