[PATCH 13/13] interconnect: mediatek: Aggregate bandwidth with saturating add

[AngeloGioacchino Del Regno]

Il 14/11/25 17:54, Nicolas Frattaroli ha scritto:
> By using a regular non-overflow-checking add, the MediaTek icc-emi
> driver will happy wrap at U32_MAX + 1 to 0. As it's common for the
> interconnect core to fill in INT_MAX values, this is not a hypothetical
> situation, but something that actually happens in regular use. This
> would be pretty disasterous if anything used this driver.
> 
> Replace the addition with an overflow-checked addition from overflow.h,
> and saturate to U32_MAX if an overflow is detected.
> 
> Fixes: b45293799f75 ("interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver")
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli at collabora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>