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authorSebastian Ott <sebott@linux.vnet.ibm.com>2017-06-21 11:20:35 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-06-28 08:32:14 +0300
commit312e8462ab6a1594a0bc4bc51c8e36c9f07b447b (patch)
tree591639ef1cb29b642d80c3b5c17de0816a55846e /arch/s390/pci
parentbe2c36769f6340322c5367586adad6c3ce1ed51a (diff)
downloadlinux-312e8462ab6a1594a0bc4bc51c8e36c9f07b447b.tar.xz
s390/pci: recognize name clashes with uids
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>
Diffstat (limited to 'arch/s390/pci')
-rw-r--r--arch/s390/pci/pci.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index d5c7444a0c05..7b30af5da222 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -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);