[PATCH v3 01/34] clk_ops: change round_rate() to return unsigned long
Mauro Carvalho Chehab
mchehab at s-opensource.com
Wed Jan 3 02:07:42 PST 2018
Em Mon, 1 Jan 2018 19:42:40 +0000
Bryan O'Donoghue <pure.logic at nexus-software.ie> escreveu:
> Right now it is not possible to return a value larger than LONG_MAX on 32
> bit systems. You can pass a rate of ULONG_MAX but can't return anything
> past LONG_MAX due to the fact both the rounded_rate and negative error
> codes are represented in the return value of round_rate().
> Most implementations either return zero on error or don't return error
> codes at all. A minority of implementations do return a negative number -
> typically -EINVAL or -ENODEV.
> At the higher level then callers of round_rate() typically and rightly
> check for a value of <= 0.
> It is possible then to convert round_rate() to an unsigned long return
> value and change error code indication for the minority from -ERRORCODE to
> a simple 0.
> This patch is the first step in making it possible to scale round_rate past
> LONG_MAX, later patches will change the previously mentioned minority of
> round_rate() implementations to return zero only on error if those
> implementations currently return a negative error number. Implementations
> that do not return an error code of < 0 will be left as-is.
> drivers/media/platform/omap3isp/isp.c | 4 ++--
Acked-by: Mauro Carvalho Chehab <mchehab at s-opensource.com>
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