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PCI/VPD: Treat invalid VPD like missing VPD capability

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Exporting sysfs files that can't be accessed doesn't make much sense.
Therefore, if either a quirk or the dynamic size calculation result in VPD
being marked as invalid, treat this as though the device has no VPD
capability.  One consequence is that the "vpd" sysfs file is not visible.

Link: https://lore.kernel.org/r/6a02b204-4ed2-4553-c3b2-eacf9554fa8d@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Heiner Kallweit 2021-08-08 19:23:57 +02:00 • committed by Bjorn Helgaas
parent 7bac54497c
commit fe7568cf2f
1 changed files with 3 additions and 6 deletions
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9
drivers/pci/vpd.c
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@ -124,9 +124,6 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
if (pos < 0)
return -EINVAL;
if (vpd->len == PCI_VPD_SZ_INVALID)
return -EIO;
if (pos > vpd->len)
return 0;
@ -188,9 +185,6 @@ static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
if (pos < 0 || (pos & 3) || (count & 3))
return -EINVAL;
if (vpd->len == PCI_VPD_SZ_INVALID)
return -EIO;
if (end > vpd->len)
return -EINVAL;
@ -231,6 +225,9 @@ void pci_vpd_init(struct pci_dev *dev)
if (!dev->vpd.len)
dev->vpd.len = pci_vpd_size(dev);
if (dev->vpd.len == PCI_VPD_SZ_INVALID)
dev->vpd.cap = 0;
}
static ssize_t vpd_read(struct file *filp, struct kobject *kobj,