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Message-ID: <20220924032127.313156-1-sunke32@huawei.com>
Date: Sat, 24 Sep 2022 11:21:27 +0800
From: Sun Ke <sunke32@...wei.com>
To: <will@...nel.org>, <mark.rutland@....com>
CC: <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
<xueshuai@...ux.alibaba.com>, <sunke32@...wei.com>
Subject: [PATCH] drivers/perf: fix return value check in ali_drw_pmu_probe()
In case of error, devm_ioremap_resource() returns ERR_PTR(),
and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().
Fixes: cf7b61073e45 ("drivers/perf: add DDR Sub-System Driveway PMU driver for Yitian 710 SoC")
Signed-off-by: Sun Ke <sunke32@...wei.com>
---
drivers/perf/alibaba_uncore_drw_pmu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/perf/alibaba_uncore_drw_pmu.c b/drivers/perf/alibaba_uncore_drw_pmu.c
index 82729b874f09..a7689fecb49d 100644
--- a/drivers/perf/alibaba_uncore_drw_pmu.c
+++ b/drivers/perf/alibaba_uncore_drw_pmu.c
@@ -658,8 +658,8 @@ static int ali_drw_pmu_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drw_pmu->cfg_base = devm_ioremap_resource(&pdev->dev, res);
- if (!drw_pmu->cfg_base)
- return -ENOMEM;
+ if (IS_ERR(drw_pmu->cfg_base))
+ return PTR_ERR(drw_pmu->cfg_base);
name = devm_kasprintf(drw_pmu->dev, GFP_KERNEL, "ali_drw_%llx",
(u64) (res->start >> ALI_DRW_PMU_PA_SHIFT));
--
2.31.1
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