Re: [PATCH] PCI: versatile: don't check resource with devm_ioremap_resource

From: Bjorn Helgaas
Date: Thu Apr 09 2015 - 15:32:44 EST

On Fri, Apr 03, 2015 at 09:17:05PM +0800, Jisheng Zhang wrote:
> devm_ioremap_resource does sanity checks on the given resource. No need
> to duplicate this in the driver. And we should check whether
> devm_ioremap_resource() succeeds or not.
> This patch fixes all of these two trival issues.
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>

This looks correct to me, so I applied it to pci/host-versatile for v4.1
(unless Rob chimes in).

commit 873581698d391ff070fc1eb8fb298c85e873c07c
Author: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Date: Fri Apr 3 21:17:05 2015 +0800

PCI: versatile: Check for devm_ioremap_resource() failures

Check for failure of devm_ioremap_resource().

devm_ioremap_resource() validates the resource it receives, so if we check
for devm_ioremap_resource() failure, we need not check for failure of the
preceding platform_get_resource().

[bhelgaas: changelog]
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>

diff --git a/drivers/pci/host/pci-versatile.c b/drivers/pci/host/pci-versatile.c
index 1ec694a52379..b1caaea740fe 100644
--- a/drivers/pci/host/pci-versatile.c
+++ b/drivers/pci/host/pci-versatile.c
@@ -138,19 +138,19 @@ static int versatile_pci_probe(struct platform_device *pdev)

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENODEV;
versatile_pci_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(versatile_pci_base))
+ return PTR_ERR(versatile_pci_base);

res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!res)
- return -ENODEV;
versatile_cfg_base[0] = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(versatile_cfg_base[0]))
+ return PTR_ERR(versatile_cfg_base[0]);

res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
- if (!res)
- return -ENODEV;
versatile_cfg_base[1] = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(versatile_cfg_base[1]))
+ return PTR_ERR(versatile_cfg_base[1]);

ret = versatile_pci_parse_request_of_pci_ranges(&pdev->dev, &pci_res);
if (ret)
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