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s390/pci: add error message for UID collision 

When UID checking was turned off during runtime in the underlying
hypervisor, a PCI device may be attached with the same UID. This is
already detected but happens silently. Add an error message so it can
more easily be understood why a device was not added.

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 09:30:00 +01:00 committed by Vasily Gorbik
parent 247f265fa5
commit 794b8846dc
1 changed files with 3 additions and 0 deletions
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3
arch/s390/pci/pci.c
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@ -27,6 +27,7 @@
#include <linux/seq_file.h>
#include <linux/jump_label.h>
#include <linux/pci.h>
#include <linux/printk.h>
#include <asm/isc.h>
#include <asm/airq.h>
@ -659,6 +660,8 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
spin_lock(&zpci_domain_lock);
if (test_bit(zdev->domain, zpci_domain)) {
spin_unlock(&zpci_domain_lock);
pr_err("Adding PCI function %08x failed because domain %04x is already assigned\n",
zdev->fid, zdev->domain);
return -EEXIST;
}
set_bit(zdev->domain, zpci_domain);