| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 239/389] powerpc/pci: Fix PHB numbering when using opal-phbid | Date | Tue, 23 Aug 2022 10:25:17 +0200 |
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From: Michael Ellerman <mpe@ellerman.id.au>
[ Upstream commit f4b39e88b42d13366b831270306326b5c20971ca ]
The recent change to the PHB numbering logic has a logic error in the handling of "ibm,opal-phbid".
When an "ibm,opal-phbid" property is present, &prop is written to and ret is set to zero.
The following call to of_alias_get_id() is skipped because ret == 0.
But then the if (ret >= 0) is true, and the body of that if statement sets prop = ret which throws away the value that was just read from "ibm,opal-phbid".
Fix the logic by only doing the ret >= 0 check in the of_alias_get_id() case.
Fixes: 0fe1e96fef0a ("powerpc/pci: Prefer PCI domain assignment via DT 'linux,pci-domain' and alias") Reviewed-by: Pali Rohár <pali@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220802105723.1055178-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/powerpc/kernel/pci-common.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 1e827e3769a8..622463a88f05 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -89,11 +89,13 @@ static int get_phb_number(struct device_node *dn) } if (ret) ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop); - if (ret) + + if (ret) { ret = of_alias_get_id(dn, "pci"); - if (ret >= 0) { - prop = ret; - ret = 0; + if (ret >= 0) { + prop = ret; + ret = 0; + } } if (ret) { u32 prop_32; -- 2.35.1
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