On 10/12/2015 11:21 PM, Arnd Bergmann wrote:

On Monday 12 October 2015 23:20:19 John Garry wrote:

quoted

+int hisi_sas_ioremap(struct hisi_hba *hisi_hba)
+{
+       struct platform_device *pdev = hisi_hba->pdev;
+       struct device *dev = &pdev->dev;
+       struct resource *res;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       hisi_hba->regs = devm_ioremap(dev,
+                                     res->start,
+                                     resource_size(res));
+       if (!hisi_hba->regs)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       hisi_hba->ctrl_regs = devm_ioremap(dev,
+                                          res->start,
+                                          resource_size(res));
+       if (!hisi_hba->ctrl_regs)
+               return -ENOMEM;
+
+       return 0;
+}

  static const struct of_device_id sas_of_match[] = {

Better use devm_ioremap_resource() here, which registers the resource so they
are checked for conflicts and listed in /proc/iomem.

Yes, hisi_hba->regs can use devm_ioremap_resource.

However ctrl_regs have to use devm_ioremap, since the address are 
sharing among different nodes, unfortunately, and devm_ioremap_resource 
will fail.

Thanks
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