linux-kernel - [PATCH] arch: powerpc: pci-common: fix wrong return value check on phd

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Date:   Mon, 18 Jun 2018 09:57:06 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     xe-kernel@...ernal.cisco.com,
        "Guilherme G . Piccoli" <gpiccoli@...ux.vnet.ibm.com>,
        Gavin Shan <gwshan@...ux.vnet.ibm.com>,
        Ian Munsie <imunsie@....ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arch: powerpc: pci-common: fix wrong return value check on phd_id

Cisco has a couple platforms which depend on the domain values getting
set a certain way. We discovered our machines not detecting the pci
devices, and traced it back to this commit,

63a7228 powerpc/pci: Assign fixed PHB number based on device-tree
properties

It seems that the code is expecting the return value of of_property_read_u64()
to be the opposite of what it actually is.. It returns zero on success, and a
negative return value on error. So if you only check when it's non-zero your
going to set Opal for all platforms but Opal, which I assume is not what was
expected.

Fix is just to negate the ret value.

Cc: xe-kernel@...ernal.cisco.com
Cc: Guilherme G. Piccoli <gpiccoli@...ux.vnet.ibm.com>
Cc: Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc: Ian Munsie <imunsie@....ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Fixes: 63a72284b159 ("powerpc/pci: Assign fixed PHB number based on device-tree properties")
Signed-off-by: Daniel Walker <danielwa@...co.com>
---
 arch/powerpc/kernel/pci-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fe9733f..0a1bcbe 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -89,7 +89,7 @@ static int get_phb_number(struct device_node *dn)
 	 * reading "ibm,opal-phbid", only present in OPAL environment.
 	 */
 	ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop);
-	if (ret) {
+	if (!ret) {
 		ret = of_property_read_u32_index(dn, "reg", 1, &prop_32);
 		prop = prop_32;
 	}
-- 
2.10.3.dirty