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PCI/IOV: Clarify error message for unbound devices

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Be more verbose to disambiguate the error case when trying to configure
SR-IOV with no driver bound vs. a driver that does not implement the
.sriov_configure() callback.

Link: https://lore.kernel.org/r/20210327175140.682708-1-mdf@kernel.org
Reported-by: Brian Foley <bpfoley@google.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
This commit is contained in:
Moritz Fischer 2021-03-27 10:51:40 -07:00 committed by Bjorn Helgaas
parent 6efb943b86
commit e9c3bbd68e
1 changed files with 9 additions and 2 deletions
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11
drivers/pci/iov.c
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@ -391,9 +391,16 @@ static ssize_t sriov_numvfs_store(struct device *dev,
if (num_vfs == pdev->sriov->num_VFs)
goto exit;
/* is PF driver loaded */
if (!pdev->driver) {
pci_info(pdev, "no driver bound to device; cannot configure SR-IOV\n");
ret = -ENOENT;
goto exit;
}
/* is PF driver loaded w/callback */
if (!pdev->driver || !pdev->driver->sriov_configure) {
pci_info(pdev, "Driver does not support SRIOV configuration via sysfs\n");
if (!pdev->driver->sriov_configure) {
pci_info(pdev, "driver does not support SR-IOV configuration via sysfs\n");
ret = -ENOENT;
goto exit;
}