[PATCH] ata: handle failure of devm_ioremap()

[Li Qiong]

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@xxxxxxxxxxxx>
---
 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