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s390/pci: add error message on device number limit

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The config option CONFIG_PCI_NR_FUNCTIONS sets a limit on the number of
PCI functions we can support. Previously on reaching this limit there
was no indication why newly attached devices are not recognized by Linux
which could be quite confusing. Thus this patch adds a pr_err() for this
case.

Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Niklas Schnelle 2019-11-28 09:31:52 +01:00 • committed by Vasily Gorbik
parent 794b8846dc
commit d497b7ec83
1 changed files with 2 additions and 0 deletions
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2
arch/s390/pci/pci.c
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@ -673,6 +673,8 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
if (zdev->domain == ZPCI_NR_DEVICES) {
spin_unlock(&zpci_domain_lock);
pr_err("Adding PCI function %08x failed because the configured limit of %d is reached\n",
zdev->fid, ZPCI_NR_DEVICES);
return -ENOSPC;
}
set_bit(zdev->domain, zpci_domain);