linux-kernel - [PATCH] ata: handle failure of devm

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Date:   Sun, 12 Jun 2022 15:32:22 +0800
From:   Li Qiong <liqiong@...china.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        hukun@...china.com, qixu@...china.com, yuzhe@...china.com,
        renyu@...china.com, Li Qiong <liqiong@...china.com>
Subject: [PATCH] ata: handle failure of devm_ioremap()

As the possible failure of the devm_ioremap(), the return value
could be NULL. Therefore it should be better to check it and
print error message, return '-ENOMEM' error code.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 drivers/ata/pata_pxa.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
index 985f42c4fd70..cd1a8f37f920 100644
--- a/drivers/ata/pata_pxa.c
+++ b/drivers/ata/pata_pxa.c
@@ -228,6 +228,11 @@ static int pxa_ata_probe(struct platform_device *pdev)
 	ap->ioaddr.bmdma_addr	= devm_ioremap(&pdev->dev, dma_res->start,
 						resource_size(dma_res));
 
+	if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr || !ap->ioaddr.bmdma_addr) {
+		dev_err(&pdev->dev, "failed to map ap->ioaddr\n");
+		return -ENOMEM;
+	}
+
 	/*
 	 * Adjust register offsets
 	 */
-- 
2.11.0