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linux/drivers/interconnect/mediatek
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Nicolas Frattaroli 6ffd02b822 interconnect: mediatek: Aggregate bandwidth with saturating add 
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: b45293799f ("interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://lore.kernel.org/r/20251124-mt8196-dvfsrc-v2-13-d9c1334db9f3@collabora.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>
2025-12-21 13:59:54 +02:00
..
icc-emi.c interconnect: mediatek: Aggregate bandwidth with saturating add 2025-12-21 13:59:54 +02:00
icc-emi.h
Kconfig interconnect: mediatek: Add support for MediaTek MT8196 EMI ICC 2025-12-21 13:59:38 +02:00
Makefile interconnect: mediatek: Add support for MediaTek MT8196 EMI ICC 2025-12-21 13:59:38 +02:00
mt8183.c interconnect: Switch back to struct platform_driver::remove() 2024-10-22 12:34:18 +03:00
mt8195.c interconnect: Switch back to struct platform_driver::remove() 2024-10-22 12:34:18 +03:00
mt8196.c interconnect: mediatek: Add support for MediaTek MT8196 EMI ICC 2025-12-21 13:59:38 +02:00