From: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
To: Gavin Shan <gwshan@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au
Subject: Re: [PATCH v2 2/4] powerpc/powernv: Fix stale PE primary bus
Date: Fri, 12 Feb 2016 17:02:46 +1100 [thread overview]
Message-ID: <56BD7586.7060803@au1.ibm.com> (raw)
In-Reply-To: <1454993431-17068-2-git-send-email-gwshan@linux.vnet.ibm.com>
On 09/02/16 15:50, Gavin Shan wrote:
> When PCI bus is unplugged during full hotplug for EEH recovery,
> the platform PE instance (struct pnv_ioda_pe) isn't released and
> it dereferences the stale PCI bus that has been released. It leads
> to kernel crash when referring to the stale PCI bus.
>
> This fixes the issue by correcting the PE's primary bus when it's
> oneline at plugging time, in pnv_pci_dma_bus_setup() which is to
> be called by pcibios_fixup_bus().
>
> Reported-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
> Reported-by: Pradipta Ghosh <pradghos@in.ibm.com>
> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
> Tested-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
I realise this has already been merged, but the following was found by
Coverity:
> +void pnv_pci_dma_bus_setup(struct pci_bus *bus)
> +{
> + struct pci_controller *hose = bus->sysdata;
> + struct pnv_phb *phb = hose->private_data;
> + struct pnv_ioda_pe *pe;
> +
> + list_for_each_entry(pe, &phb->ioda.pe_list, list) {
> + if (!(pe->flags | (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)))
> + continue;
This condition is always false. I think the first "|" is supposed to be "&".
--
Andrew Donnellan Software Engineer, OzLabs
andrew.donnellan@au1.ibm.com Australia Development Lab, Canberra
+61 2 6201 8874 (work) IBM Australia Limited
next prev parent reply other threads:[~2016-02-12 6:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 4:50 [PATCH v2 1/4] powerpc/eeh: Fix stale cached primary bus Gavin Shan
2016-02-09 4:50 ` [PATCH v2 2/4] powerpc/powernv: Fix stale PE " Gavin Shan
2016-02-12 6:02 ` Andrew Donnellan [this message]
2016-02-12 6:09 ` Gavin Shan
2016-02-15 10:38 ` Michael Ellerman
2016-02-15 22:43 ` Gavin Shan
2016-02-09 4:50 ` [PATCH v2 3/4] powerpc/eeh: Reworked eeh_pe_bus_get() Gavin Shan
2016-03-09 12:51 ` [v2,3/4] " Michael Ellerman
2016-02-09 4:50 ` [PATCH v2 4/4] powerpc/powernv: Simplify definitions of EEH debugfs handlers Gavin Shan
2016-02-17 12:41 ` [v2, " Michael Ellerman
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