linux-kernel - [PATCH] mailbox: th1520: Fix a NULL vs IS

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Message-ID: <bda05d7b-5a6e-4f57-a124-ba56f51da031@stanley.mountain>
Date: Sat, 30 Nov 2024 13:07:39 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Michal Wilczynski <m.wilczynski@...sung.com>
Cc: Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>,
	Fu Wei <wefu@...hat.com>, Jassi Brar <jassisinghbrar@...il.com>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] mailbox: th1520: Fix a NULL vs IS_ERR() bug

The devm_ioremap() function doesn't return error pointers, it returns
NULL.  Update the error checking to match.

Fixes: 5d4d263e1c6b ("mailbox: Introduce support for T-head TH1520 Mailbox driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/mailbox/mailbox-th1520.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/mailbox-th1520.c b/drivers/mailbox/mailbox-th1520.c
index 4e84640ac3b8..e16e7c85ee3c 100644
--- a/drivers/mailbox/mailbox-th1520.c
+++ b/drivers/mailbox/mailbox-th1520.c
@@ -387,8 +387,10 @@ static void __iomem *th1520_map_mmio(struct platform_device *pdev,
 
 	mapped = devm_ioremap(&pdev->dev, res->start + offset,
 			      resource_size(res) - offset);
-	if (IS_ERR(mapped))
+	if (!mapped) {
 		dev_err(&pdev->dev, "Failed to map resource: %s\n", res_name);
+		return ERR_PTR(-ENOMEM);
+	}
 
 	return mapped;
 }
-- 
2.45.2