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authorSubbaraya Sundeep <sbhatta@marvell.com>2019-11-04 12:27:44 +0530
committerBjorn Helgaas <bhelgaas@google.com>2019-11-14 15:02:10 -0600
commit73884a7082f466ce6686bb8dd7e6571dd42313b4 (patch)
tree9a81a92c5af1caf203f749c6dc160c7038bb851f /drivers/memstick
parentc13704f5685deb7d6eb21e293233e0901ed77377 (diff)
PCI: Do not use bus number zero from EA capability
As per PCIe r5.0, sec 7.8.5.2, fixed bus numbers of a bridge must be zero when no function that uses EA is located behind it. Hence, if EA supplies bus numbers of zero, assign bus numbers normally. A secondary bus can never have a bus number of zero, so setting a bridge's Secondary Bus Number to zero makes downstream devices unreachable. [bhelgaas: retain bool return value so "zero is invalid" logic is local] Fixes: 2dbce5901179 ("PCI: Assign bus numbers present in EA capability for bridges") Link: https://lore.kernel.org/r/1572850664-9861-1-git-send-email-sundeep.lkml@gmail.com Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org # v5.2+
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