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Subject: Re: [PATCH] fbdev/pxafb: Fix multiple clamped values in
 pxafb_adjust_timing
To: Thorsten Blum <thorsten.blum@linux.dev>
Cc: Chelsy Ratnawat <chelsyratnawat2001@gmail.com>,
 Thomas Zimmermann <tzimmermann@suse.de>,
 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
 Raag Jadav <raag.jadav@intel.com>, linux-fbdev@vger.kernel.org,
 dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <20251202181600.511166-2-thorsten.blum@linux.dev>
 <a7213b69-f6ae-4975-8c8b-2783dbe9f9b3@gmx.de>
 <C3FDBCE7-14D9-4999-B463-C2E3E384E7DB@linux.dev>
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On 12/2/25 19:36, Thorsten Blum wrote:
> On 2. Dec 2025, at 19:28, Helge Deller wrote:
>> On 12/2/25 19:15, Thorsten Blum wrote:
>>> The variables were never clamped because the return value of clamp_val=
()
>>> was not used. Fix this by assigning the clamped values, and use clamp(=
)
>>> instead of clamp_val().
>>> Cc: stable@vger.kernel.org
>>> Fixes: 3f16ff608a75 ("[ARM] pxafb: cleanup of the timing checking code=
")
>>> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
>>> ---
>>>   drivers/video/fbdev/pxafb.c | 12 ++++++------
>>>   1 file changed, 6 insertions(+), 6 deletions(-)
>>
>> Thanks for the patch!
>> It looks good, so I'll include it in the fbdev tree.
>> Out of curiosity:
>> How did you notice? Do you actually have the hardware and tested it?
>=20
> I only compile-tested it.
>=20
> I stumbled upon another driver with the same bug and then used grep to
> search for other instances and found about 6 or 7, including this one.

Ok. But this then means, maybe the clamping isn't needed (since nobody com=
plained),
or that nobody noticed because nobody uses the driver any longer.
Anyway, I believe the patch is correct, so I leave it in.

Thank you!
Helge