From: Yijing Wang Date: Tue, 15 Jan 2013 03:12:16 +0000 (+0800) Subject: PCI: Enable ARI if dev and upstream bridge support it; disable otherwise X-Git-Tag: v3.2.55~61 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a6ac4b93f6c2fb3d2b1aa95f32c6729fa4e9676;p=pandora-kernel.git PCI: Enable ARI if dev and upstream bridge support it; disable otherwise commit b0cc6020e1cc62f1253215f189611b34be4a83c7 upstream. Currently, we enable ARI in a device's upstream bridge if the bridge and the device support it. But we never disable ARI, even if the device is removed and replaced with a device that doesn't support ARI. This means that if we hot-remove an ARI device and replace it with a non-ARI multi-function device, we find only function 0 of the new device because the upstream bridge still has ARI enabled, and next_ari_fn() only returns function 0 for the new non-ARI device. This patch disables ARI in the upstream bridge if the device doesn't support ARI. See the PCIe spec, r3.0, sec 6.13. [bhelgaas: changelog, function comment] [yijing: replace PCIe Cap accessor with legacy PCI accessor] Signed-off-by: Yijing Wang Signed-off-by: Jiang Liu Signed-off-by: Bjorn Helgaas Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed