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s390/pci: recognize name clashes with uids

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When uid checking is enabled firmware guarantees uniqueness of the uids
and we use them for device enumeration. Tests have shown that uid checking
can be toggled at runtime. This is unfortunate since it can lead to name
clashes.

Recognize these name clashes by allocating bits in zpci_domain even for
firmware provided ids.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2017-06-21 10:20:35 +02:00 committed by Martin Schwidefsky
parent be2c36769f
commit 312e8462ab
1 changed files with 11 additions and 1 deletions
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12
arch/s390/pci/pci.c
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@ -736,6 +736,16 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
{
if (zpci_unique_uid) {
zdev->domain = (u16) zdev->uid;
if (zdev->domain >= ZPCI_NR_DEVICES)
return 0;
spin_lock(&zpci_domain_lock);
if (test_bit(zdev->domain, zpci_domain)) {
spin_unlock(&zpci_domain_lock);
return -EEXIST;
}
set_bit(zdev->domain, zpci_domain);
spin_unlock(&zpci_domain_lock);
return 0;
}
@ -752,7 +762,7 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
static void zpci_free_domain(struct zpci_dev *zdev)
{
if (zpci_unique_uid)
if (zdev->domain >= ZPCI_NR_DEVICES)
return;
spin_lock(&zpci_domain_lock);