linux-kernel - [PATCH v4 01/10] soc: qcom: cpr3: Fix 'acc

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Message-ID: <20240703091651.2820236-2-quic_varada@quicinc.com>
Date: Wed, 3 Jul 2024 14:46:42 +0530
From: Varadarajan Narayanan <quic_varada@...cinc.com>
To: <vireshk@...nel.org>, <nm@...com>, <sboyd@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <angelogioacchino.delregno@...labora.com>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <mturquette@...libre.com>,
        <ilia.lin@...nel.org>, <rafael@...nel.org>, <ulf.hansson@...aro.org>,
        <quic_sibis@...cinc.com>, <quic_rjendra@...cinc.com>,
        <quic_rohiagar@...cinc.com>, <abel.vesa@...aro.org>,
        <otto.pflueger@...cue.de>, <danila@...xyga.com>,
        <quic_varada@...cinc.com>, <quic_ipkumar@...cinc.com>,
        <luca@...tu.xyz>, <stephan.gerhold@...nkonzept.com>, <nks@...wful.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
Subject: [PATCH v4 01/10] soc: qcom: cpr3: Fix 'acc_desc' usage

cpr3 code assumes that 'acc_desc' is available for SoCs
implementing CPR version 4 or less. However, IPQ9574 SoC
implements CPRv4 without ACC. This causes NULL pointer accesses
resulting in crashes. Hence, check if 'acc_desc' is populated
before using it.

Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
---
v4: Undo the acc_desc validation in probe function as that could
    affect other SoC.
---
 drivers/pmdomain/qcom/cpr3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pmdomain/qcom/cpr3.c b/drivers/pmdomain/qcom/cpr3.c
index c7790a71e74f..6ceb7605f84d 100644
--- a/drivers/pmdomain/qcom/cpr3.c
+++ b/drivers/pmdomain/qcom/cpr3.c
@@ -2399,12 +2399,12 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain,
 		if (ret)
 			goto exit;
 
-		if (acc_desc->config)
+		if (acc_desc && acc_desc->config)
 			regmap_multi_reg_write(drv->tcsr, acc_desc->config,
 					       acc_desc->num_regs_per_fuse);
 
 		/* Enable ACC if required */
-		if (acc_desc->enable_mask)
+		if (acc_desc && acc_desc->enable_mask)
 			regmap_update_bits(drv->tcsr, acc_desc->enable_reg,
 					   acc_desc->enable_mask,
 					   acc_desc->enable_mask);
-- 
2.34.1