| Message ID | 20170817110614.11454-1-thierry.reding@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Thu, Aug 17, 2017 at 01:06:14PM +0200, Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > If the pci_find_pcie_root_port() function is called on a root port > itself, return the root port rather than NULL. > > This effectively reverts commit 0e405232871d6 ("PCI: fix oops when > try to find Root Port for a PCI device") which added an extra check > that would now be redundant. > > Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported") > Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum") > Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> I *think* this should work for everybody, but I can't test it personally. > --- > This applies on top of and was tested on next-20170817. > > Michael, it'd be great if you could test this one again to clarify > whether or not the fix that's already in Linus' tree is still needed, or > whether it's indeed obsoleted by this patch. > > drivers/pci/pci.c | 9 ++++----- > 1 file changed, 4 insertions(+), 5 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index b05c587e335a..dd56c1c05614 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -514,7 +514,7 @@ EXPORT_SYMBOL(pci_find_resource); > */ > struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) > { > - struct pci_dev *bridge, *highest_pcie_bridge = NULL; > + struct pci_dev *bridge, *highest_pcie_bridge = dev; > > bridge = pci_upstream_bridge(dev); > while (bridge && pci_is_pcie(bridge)) { > @@ -522,11 +522,10 @@ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) > bridge = pci_upstream_bridge(bridge); > } > > - if (highest_pcie_bridge && > - pci_pcie_type(highest_pcie_bridge) == PCI_EXP_TYPE_ROOT_PORT) > - return highest_pcie_bridge; > + if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) > + return NULL; > > - return NULL; > + return highest_pcie_bridge; > } > EXPORT_SYMBOL(pci_find_pcie_root_port); > > -- > 2.13.3 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hi On 2017/8/17 19:06, Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > If the pci_find_pcie_root_port() function is called on a root port > itself, return the root port rather than NULL. > > This effectively reverts commit 0e405232871d6 ("PCI: fix oops when > try to find Root Port for a PCI device") which added an extra check > that would now be redundant. > > Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported") > Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum") > Signed-off-by: Thierry Reding <treding@nvidia.com> Tested-by: Shawn Lin <shawn.lin@rock-chips.com> > --- > This applies on top of and was tested on next-20170817. > > Michael, it'd be great if you could test this one again to clarify > whether or not the fix that's already in Linus' tree is still needed, or > whether it's indeed obsoleted by this patch. > > drivers/pci/pci.c | 9 ++++----- > 1 file changed, 4 insertions(+), 5 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index b05c587e335a..dd56c1c05614 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -514,7 +514,7 @@ EXPORT_SYMBOL(pci_find_resource); > */ > struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) > { > - struct pci_dev *bridge, *highest_pcie_bridge = NULL; > + struct pci_dev *bridge, *highest_pcie_bridge = dev; > > bridge = pci_upstream_bridge(dev); > while (bridge && pci_is_pcie(bridge)) { > @@ -522,11 +522,10 @@ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) > bridge = pci_upstream_bridge(bridge); > } > > - if (highest_pcie_bridge && > - pci_pcie_type(highest_pcie_bridge) == PCI_EXP_TYPE_ROOT_PORT) > - return highest_pcie_bridge; > + if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) > + return NULL; > > - return NULL; > + return highest_pcie_bridge; > } > EXPORT_SYMBOL(pci_find_pcie_root_port); > >
Thierry Reding <thierry.reding@gmail.com> writes: > From: Thierry Reding <treding@nvidia.com> > > If the pci_find_pcie_root_port() function is called on a root port > itself, return the root port rather than NULL. > > This effectively reverts commit 0e405232871d6 ("PCI: fix oops when > try to find Root Port for a PCI device") which added an extra check > that would now be redundant. > > Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported") > Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum") > Signed-off-by: Thierry Reding <treding@nvidia.com> > --- > This applies on top of and was tested on next-20170817. > > Michael, it'd be great if you could test this one again to clarify > whether or not the fix that's already in Linus' tree is still needed, or > whether it's indeed obsoleted by this patch. This works fine for me, applied on top of Linus' tree (d33a2a914319). cheers
From: Thierry Reding <thierry.reding@gmail.com> Date: Thu, 17 Aug 2017 13:06:14 +0200 > From: Thierry Reding <treding@nvidia.com> > > If the pci_find_pcie_root_port() function is called on a root port > itself, return the root port rather than NULL. > > This effectively reverts commit 0e405232871d6 ("PCI: fix oops when > try to find Root Port for a PCI device") which added an extra check > that would now be redundant. > > Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported") > Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum") > Signed-off-by: Thierry Reding <treding@nvidia.com> > --- > This applies on top of and was tested on next-20170817. > > Michael, it'd be great if you could test this one again to clarify > whether or not the fix that's already in Linus' tree is still needed, or > whether it's indeed obsoleted by this patch. Applied, thanks everyone.
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b05c587e335a..dd56c1c05614 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -514,7 +514,7 @@ EXPORT_SYMBOL(pci_find_resource); */ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) { - struct pci_dev *bridge, *highest_pcie_bridge = NULL; + struct pci_dev *bridge, *highest_pcie_bridge = dev; bridge = pci_upstream_bridge(dev); while (bridge && pci_is_pcie(bridge)) { @@ -522,11 +522,10 @@ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) bridge = pci_upstream_bridge(bridge); } - if (highest_pcie_bridge && - pci_pcie_type(highest_pcie_bridge) == PCI_EXP_TYPE_ROOT_PORT) - return highest_pcie_bridge; + if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) + return NULL; - return NULL; + return highest_pcie_bridge; } EXPORT_SYMBOL(pci_find_pcie_root_port);