linux-kernel - [PATCH v4 1/2] clk: hisilicon: Use correct return value about hisi_reset

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Message-Id: <1590590362-11570-1-git-send-email-yangtiezhu@loongson.cn>
Date:   Wed, 27 May 2020 22:39:21 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
Subject: [PATCH v4 1/2] clk: hisilicon: Use correct return value about hisi_reset_init()

The return value about hisi_reset_init() is not correct, fix it.

Fixes: e9a2310fb689 ("reset: hisilicon: fix potential NULL pointer dereference")
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---

v2:
  - No changes, just add "Fixes:" tag

v3:
  - Use ERR_CAST(rstc->membase) to fix the sparse warning

v4:
  - No changes

 drivers/clk/hisilicon/clk-hi3519.c      | 4 ++--
 drivers/clk/hisilicon/crg-hi3516cv300.c | 4 ++--
 drivers/clk/hisilicon/crg-hi3798cv200.c | 4 ++--
 drivers/clk/hisilicon/reset.c           | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/hisilicon/clk-hi3519.c b/drivers/clk/hisilicon/clk-hi3519.c
index ad0c7f3..803fa66 100644
--- a/drivers/clk/hisilicon/clk-hi3519.c
+++ b/drivers/clk/hisilicon/clk-hi3519.c
@@ -149,8 +149,8 @@ static int hi3519_clk_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	crg->rstc = hisi_reset_init(pdev);
-	if (!crg->rstc)
-		return -ENOMEM;
+	if (IS_ERR(crg->rstc))
+		return PTR_ERR(crg->rstc);
 
 	crg->clk_data = hi3519_clk_register(pdev);
 	if (IS_ERR(crg->clk_data)) {
diff --git a/drivers/clk/hisilicon/crg-hi3516cv300.c b/drivers/clk/hisilicon/crg-hi3516cv300.c
index 5d4e61c..c2af03d 100644
--- a/drivers/clk/hisilicon/crg-hi3516cv300.c
+++ b/drivers/clk/hisilicon/crg-hi3516cv300.c
@@ -271,8 +271,8 @@ static int hi3516cv300_crg_probe(struct platform_device *pdev)
 		return -ENOENT;
 
 	crg->rstc = hisi_reset_init(pdev);
-	if (!crg->rstc)
-		return -ENOMEM;
+	if (IS_ERR(crg->rstc))
+		return PTR_ERR(crg->rstc);
 
 	crg->clk_data = crg->funcs->register_clks(pdev);
 	if (IS_ERR(crg->clk_data)) {
diff --git a/drivers/clk/hisilicon/crg-hi3798cv200.c b/drivers/clk/hisilicon/crg-hi3798cv200.c
index 08a19ba..66fd6a9 100644
--- a/drivers/clk/hisilicon/crg-hi3798cv200.c
+++ b/drivers/clk/hisilicon/crg-hi3798cv200.c
@@ -354,8 +354,8 @@ static int hi3798cv200_crg_probe(struct platform_device *pdev)
 		return -ENOENT;
 
 	crg->rstc = hisi_reset_init(pdev);
-	if (!crg->rstc)
-		return -ENOMEM;
+	if (IS_ERR(crg->rstc))
+		return PTR_ERR(crg->rstc);
 
 	crg->clk_data = crg->funcs->register_clks(pdev);
 	if (IS_ERR(crg->clk_data)) {
diff --git a/drivers/clk/hisilicon/reset.c b/drivers/clk/hisilicon/reset.c
index 93cee17..c733e2e 100644
--- a/drivers/clk/hisilicon/reset.c
+++ b/drivers/clk/hisilicon/reset.c
@@ -93,11 +93,11 @@ struct hisi_reset_controller *hisi_reset_init(struct platform_device *pdev)
 
 	rstc = devm_kmalloc(&pdev->dev, sizeof(*rstc), GFP_KERNEL);
 	if (!rstc)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	rstc->membase = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rstc->membase))
-		return NULL;
+		return ERR_CAST(rstc->membase);
 
 	spin_lock_init(&rstc->lock);
 	rstc->rcdev.owner = THIS_MODULE;
-- 
2.1.0