linux-kernel - [PATCH] soc: bcm: brcmstb: biuctrl: fix of

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Date:   Mon, 27 Mar 2023 19:54:22 +0800
From:   Zhaoyang Li <lizhaoyang04@...t.edu.cn>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Zhaoyang Li <lizhaoyang04@...t.edu.cn>,
        Dan Carpenter <error27@...il.com>,
        Dongliang Mu <dzm91@...t.edu.cn>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: bcm: brcmstb: biuctrl: fix of_iomap leak

Smatch reports:

drivers/soc/bcm/brcmstb/biuctrl.c:291 setup_hifcpubiuctrl_regs() warn:
'cpubiuctrl_base' from of_iomap() not released on lines: 291.

This is because in setup_hifcpubiuctrl_regs(),
cpubiuctrl_base is not released when handle error, which may cause a leak.
To fix this, iounmap is added when handle error.

Fixes: 22f7a9116eba ("soc: brcmstb: Correct CPU_CREDIT_REG offset for Brahma-B53 CPUs")
Signed-off-by: Zhaoyang Li <lizhaoyang04@...t.edu.cn>
Reviewed-by: Dan Carpenter <error27@...il.com>
Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
---
>From static analysis. Untested
---
 drivers/soc/bcm/brcmstb/biuctrl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
index e1d7b4543248..c92693fad1d2 100644
--- a/drivers/soc/bcm/brcmstb/biuctrl.c
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -288,6 +288,10 @@ static int __init setup_hifcpubiuctrl_regs(struct device_node *np)
 	if (BRCM_ID(family_id) == 0x7260 && BRCM_REV(family_id) == 0)
 		cpubiuctrl_regs = b53_cpubiuctrl_no_wb_regs;
 out:
+	if (ret && cpubiuctrl_base) {
+		iounmap(cpubiuctrl_base);
+		cpubiuctrl_base = NULL;
+	}
 	return ret;
 }
 
-- 
2.25.1