kernel/linux.git/drivers/devfreq/mtk-cci-devfreq.c, branch v6.1.168

PM / devfreq: mtk-cci: Fix potential error pointer dereference in probe()

2025-10-15T09:56:27+00:00

[ Upstream commit fc33bf0e097c6834646b98a7b3da0ae5b617f0f9 ] The drv->sram_reg pointer could be set to ERR_PTR(-EPROBE_DEFER) which would lead to a error pointer dereference. Use IS_ERR_OR_NULL() to check that the pointer is valid. Fixes: e09bd5757b52 ("PM / devfreq: mtk-cci: Handle sram regulator probe deferral") Signed-off-by: Dan Carpenter Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/aJTNHz8kk8s6Q2os@stanley.mountain/ Signed-off-by: Sasha Levin

PM / devfreq: mtk-cci: Handle sram regulator probe deferral

2022-09-25T18:59:12+00:00

If the regulator_get_optional() call for the SRAM regulator returns a probe deferral, we must bail out and retry probing later: failing to do this will produce unstabilities on platforms requiring the handling for this regulator. Fixes: b615b00c42da ("PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver") Signed-off-by: AngeloGioacchino Del Regno Signed-off-by: Chanwoo Choi

PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver

2022-07-15T02:40:08+00:00

We introduce a devfreq driver for the MediaTek Cache Coherent Interconnect (CCI) used by some MediaTek SoCs. In this driver, we use the passive devfreq driver to get target frequencies and adjust voltages accordingly. In MT8183 and MT8186, the MediaTek CCI is supplied by the same regulators with the little core CPUs. Signed-off-by: Jia-Wei Chang Signed-off-by: Johnson Wang Acked-by: Chanwoo Choi Tested-by: Kevin Hilman Signed-off-by: Chanwoo Choi