Re: [PATCH] smiapp: Fix BUG_ON() on an impossible condition

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Hello Sakari

I always try to send the patches to the mails found by
get-maintainer.pl, I thought it was unpolite not doint so :). In the
future I will try to send the mails only to the media list.

I don't have a tree, so please do as you wish.


Thanks!

On Wed, Nov 6, 2013 at 3:58 PM, Sakari Ailus <sakari.ailus@xxxxxx> wrote:
> Hi Ricardo,
>
> Thanks for the patch.
>
> I've removed LKML from cc since I don't think this is anything but noise
> there.
>
> On Wed, Nov 06, 2013 at 03:21:30PM +0100, Ricardo Ribalda Delgado wrote:
>> internal_csi_format_idx and csi_format_idx are unsigned integers,
>> therefore they can never be nevative.
>>
>> CC      drivers/media/i2c/smiapp/smiapp-core.o
>> In file included from include/linux/err.h:4:0,
>>                  from include/linux/clk.h:15,
>>                  from drivers/media/i2c/smiapp/smiapp-core.c:29:
>> drivers/media/i2c/smiapp/smiapp-core.c: In function ‘smiapp_update_mbus_formats’:
>> include/linux/kernel.h:669:20: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
>>  #define min(x, y) ({    \
>>                     ^
>> include/linux/compiler.h:153:42: note: in definition of macro ‘unlikely’
>>  # define unlikely(x) __builtin_expect(!!(x), 0)
>>                                           ^
>> drivers/media/i2c/smiapp/smiapp-core.c:402:2: note: in expansion of macro ‘BUG_ON’
>>   BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
>>   ^
>> drivers/media/i2c/smiapp/smiapp-core.c:402:9: note: in expansion of macro ‘min’
>>   BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
>>          ^
>>
>> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
>> ---
>>  drivers/media/i2c/smiapp/smiapp-core.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/media/i2c/smiapp/smiapp-core.c b/drivers/media/i2c/smiapp/smiapp-core.c
>> index ae66d91..fbd48f0 100644
>> --- a/drivers/media/i2c/smiapp/smiapp-core.c
>> +++ b/drivers/media/i2c/smiapp/smiapp-core.c
>> @@ -399,7 +399,6 @@ static void smiapp_update_mbus_formats(struct smiapp_sensor *sensor)
>>
>>       BUG_ON(max(internal_csi_format_idx, csi_format_idx) + pixel_order
>>              >= ARRAY_SIZE(smiapp_csi_data_formats));
>> -     BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
>>
>>       dev_dbg(&client->dev, "new pixel order %s\n",
>>               pixel_order_str[pixel_order]);
>
> I wonder how this hasn't been noticed before. :-) No harm done, though.
>
> Acked-by: Sakari Ailus <sakari.ailus@xxxxxx>
>
> Should I take the patch to my tree? I don't think I have other pending
> patches for smiapp so I'm fine that you have it in yours, too.
>
> --
> Kind regards,
>
> Sakari Ailus
> e-mail: sakari.ailus@xxxxxx     XMPP: sailus@xxxxxxxxxxxxxx



-- 
Ricardo Ribalda
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