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From 9723c25f99aff0451cfe6392e1b9fdd99d0bf9f0 Mon Sep 17 00:00:00 2001
From: Tyrel Datwyler <tyreld@linux.ibm.com>
Date: Sun, 10 Nov 2019 23:21:31 -0600
Subject: [PATCH] PCI: rpaphp: Fix up pointer to first drc-info entry

References: FATE#326955 bsc#1157480 ltc#181028
Patch-mainline: v5.5-rc1
Git-commit: 9723c25f99aff0451cfe6392e1b9fdd99d0bf9f0

The first entry of the ibm,drc-info property is an int encoded count
of the number of drc-info entries that follow. The "value" pointer
returned by of_prop_next_u32() is still pointing at the this value
when we call of_read_drc_info_cell(), but the helper function
expects that value to be pointing at the first element of an entry.

Fix up by incrementing the "value" pointer to point at the first
element of the first drc-info entry prior.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1573449697-5448-5-git-send-email-tyreld@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 drivers/pci/hotplug/rpaphp_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index 18627bb21e9e..e3502644a45c 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -239,6 +239,8 @@ static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
 	value = of_prop_next_u32(info, NULL, &entries);
 	if (!value)
 		return -EINVAL;
+	else
+		value++;
 
 	for (j = 0; j < entries; j++) {
 		of_read_drc_info_cell(&info, &value, &drc);
-- 
2.23.0