linux-kernel - [PATCH] mtd: rawnand: mxic: Enable and prepare clocks in probe

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Date:   Thu, 12 Aug 2021 14:38:00 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Kirill Shilimanov <kirill.shilimanov@...wei.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] mtd: rawnand: mxic: Enable and prepare clocks in probe

It seems that mxic_nfc_probe() missed invocation of
mxic_nfc_clk_enable(). The patch fixed that. In addition, error handling
was refined appropriately.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
Co-developed-by: Kirill Shilimanov <kirill.shilimanov@...wei.com>
Signed-off-by: Kirill Shilimanov <kirill.shilimanov@...wei.com>
---
 drivers/mtd/nand/raw/mxic_nand.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/mxic_nand.c b/drivers/mtd/nand/raw/mxic_nand.c
index da1070993994..37e75bf60ee5 100644
--- a/drivers/mtd/nand/raw/mxic_nand.c
+++ b/drivers/mtd/nand/raw/mxic_nand.c
@@ -509,9 +509,15 @@ static int mxic_nfc_probe(struct platform_device *pdev)
 	if (IS_ERR(nfc->send_dly_clk))
 		return PTR_ERR(nfc->send_dly_clk);
 
+	err = mxic_nfc_clk_enable(nfc);
+	if (err)
+		return err;
+
 	nfc->regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(nfc->regs))
-		return PTR_ERR(nfc->regs);
+	if (IS_ERR(nfc->regs)) {
+		err = PTR_ERR(nfc->regs);
+		goto fail;
+	}
 
 	nand_chip = &nfc->chip;
 	mtd = nand_to_mtd(nand_chip);
@@ -527,8 +533,10 @@ static int mxic_nfc_probe(struct platform_device *pdev)
 	nand_chip->controller = &nfc->controller;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
+	if (irq < 0) {
+		err = irq;
+		goto fail;
+	}
 
 	mxic_nfc_hw_init(nfc);
 
-- 
2.26.2