[PATCH] Fix divide-by-zero on DP unplug with nouveau

[Linux regression tracking (Thorsten Leemhuis)]

On 11.03.24 17:09, Imre Deak wrote:
> On Sat, Feb 10, 2024 at 09:24:59PM +0000, Chris Bainbridge wrote:
> Sorry for the delay.

Happens, thx for looking onto this!

>> The following trace occurs when using nouveau and unplugging a DP MST
>> adaptor:
> [...] 
>> +	if (bpp_x16 == 0)
>> +		return 0;
> 
> Could you please move the check to the beginnig of the function and add
> a debug message in case bpp_x16 is 0?
> 
> It looks odd that a driver calls this function with a 0 bpp_x16, and
> ideally it should be fixed in the driver. However as it's a regression
> and we don't have a better idea now:
> 
> Acked-by: Imre Deak <imre.deak at intel.com>

Chris: as this went into 6.8, please consider adding a stable-tag to
ensure Greg picks this up.

Ciao, Thorsten