lkml.org 
[lkml]   [2019]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv3 17/27] PCI: mobiveil: fix the checking of valid device
[+cc Thomas]

On Fri, Feb 08, 2019 at 06:11:15PM +0530, Subrahmanya Lingappa wrote:
> On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@nxp.com> wrote:
> >
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > Avoid to issue CFG transactions to link partner when the PCIe
> > link is not up. And allow CFG transactions to all functions of
> > Endpoint implemented multiple functions.
> >
> > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host
> > Bridge IP driver")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
> > ---
> > V3:
> > - No change
> >
> > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++-
> > 1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > index dc5324d94466..1ae82e790562 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
> > {
> > struct mobiveil_pcie *pcie = bus->sysdata;
> >
> > + /* If there is no link, then there is no device */
> > + if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie))
> > + return false;
> > +
> > /* Only one device down on each root port */
> > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0))
> > return false;
> > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
> > * Do not read more than one device on the bus directly
> > * attached to RC
> > */
> > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0))
> > + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > 0))

> here change "primary" to "number", as it's a bug in the original driver too.

This looks like it should be split into two patches: (1) checking for
link up, and (2) checking root_bus_nr.

And if you mean "bus->primary == pcie->rp.root_bus_nr" is a bug in
pci-aardvark.c, too, it is imperative to fix that bug also (with a
separate patch).

> > return false;
> >
> > return true;
> > --
> > 2.17.1
> >
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

\
 
 \ /
  Last update: 2019-02-08 15:13    [W:0.086 / U:4.620 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site