This is a note to let you know that I've just added the patch titled
PCI: rpaphp: Don't rely on firmware feature to imply drc-info support
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-rpaphp-don-t-rely-on-firmware-feature-to-imply-d.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 13dea11f7a75cdd78cd936fa7a74ebfe1ce92e34
Author: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
Date: Sun Nov 10 23:21:32 2019 -0600
PCI: rpaphp: Don't rely on firmware feature to imply drc-info support
[ Upstream commit 52e2b0f16574afd082cff0f0e8567b2d9f68c033 ]
In the event that the partition is migrated to a platform with older
firmware that doesn't support the ibm,drc-info property the device
tree is modified to remove the ibm,drc-info property and replace it
with the older style ibm,drc-* properties for types, names, indexes,
and power-domains. One of the requirements of the drc-info firmware
feature is that the client is able to handle both the new property,
and old style properties at runtime. Therefore we can't rely on the
firmware feature alone to dictate which property is currently
present in the device tree.
Fix this short coming by checking explicitly for the ibm,drc-info
property, and falling back to the older ibm,drc-* properties if it
doesn't exist.
Signed-off-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1573449697-5448-6-git-send-email-tyreld@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index f56004243591..ccc6deeb9ccf 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -275,7 +275,7 @@ int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
return -EINVAL;
}
- if (firmware_has_feature(FW_FEATURE_DRC_INFO))
+ if (of_find_property(dn->parent, "ibm,drc-info", NULL))
return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
*my_index);
else
