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mcb: mcb-pci: detect IO mapped devices before requesting resources

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If the memory region is requested with devm_request_mem_region()
for an IO mapped device it will return an error and mcb-pci will
incorrectly report it with EBUSY code.

Make sure we identify if the reosure is IO mapped and fail early
with a correct ENOTSUPP code.

Reviewed-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@duagon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@duagon.com>
Link: https://lore.kernel.org/r/20240523103430.423340-1-jorge.sanjuangarcia@duagon.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sanjuán García, Jorge 2024-05-23 10:35:03 +00:00 committed by Greg Kroah-Hartman
parent 10724d5d47
commit a774c5d1f9
1 changed files with 8 additions and 8 deletions
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16
drivers/mcb/mcb-pci.c
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@ -45,6 +45,14 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
}
pci_set_master(pdev);
flags = pci_resource_flags(pdev, 0);
if (flags & IORESOURCE_IO) {
ret = -ENOTSUPP;
dev_err(&pdev->dev,
"IO mapped PCI devices are not supported\n");
goto out_disable;
}
priv->mapbase = pci_resource_start(pdev, 0);
if (!priv->mapbase) {
dev_err(&pdev->dev, "No PCI resource\n");
@ -68,14 +76,6 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto out_disable;
}
flags = pci_resource_flags(pdev, 0);
if (flags & IORESOURCE_IO) {
ret = -ENOTSUPP;
dev_err(&pdev->dev,
"IO mapped PCI devices are not supported\n");
goto out_disable;
}
pci_set_drvdata(pdev, priv);
priv->bus = mcb_alloc_bus(&pdev->dev);