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From: Bjorn Helgaas <helgaas@kernel.org>
To: "Kuppuswamy,
	Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	ashok.raj@intel.com
Subject: Re: [PATCH v18 05/11] PCI/ERR: Remove service dependency in pcie_do_recovery()
Date: Sat, 28 Mar 2020 16:32:41 -0500
Message-ID: <20200328213241.GA127815@google.com> (raw)
In-Reply-To: <bcc1910b-90fe-25b5-3cee-8f9d7e83e45e@linux.intel.com>

On Sat, Mar 28, 2020 at 02:12:48PM -0700, Kuppuswamy, Sathyanarayanan wrote:
> On 3/23/20 5:26 PM, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> > 
> 
> > +void pcie_do_recovery(struct pci_dev *dev,
> > +		      enum pci_channel_state state,
> > +		      pci_ers_result_t (*reset_link)(struct pci_dev *pdev))
> >   {
> >   	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
> >   	struct pci_bus *bus;
> > @@ -206,9 +165,12 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state,
> >   	pci_dbg(dev, "broadcast error_detected message\n");
> >   	if (state == pci_channel_io_frozen) {
> >   		pci_walk_bus(bus, report_frozen_detected, &status);
> > -		status = reset_link(dev, service);
> > -		if 		if (reset_link)
> 			status = reset_link(dev);(status == PCI_ERS_RESULT_DISCONNECT
> > +		status = reset_link(dev);
> Above line needs to be replaced as below. Since there is a
> possibility reset_link can NULL (eventhough currently its
> not true).
> 		if (reset_link)
> 			status = reset_link(dev);
> Shall I submit another version to add above fix on top of
> our pci/edr branch ?

No, I can squash that in if needed.

But I don't actually think we *do* need it.  All the callers supply a
valid reset_link function pointer, and if somebody changes or adds a
new one that doesn't, I'd rather take the null pointer exception and
find out about it than silently ignore it.

Bjorn

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24  0:25 [PATCH v18 00/11] Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-24  0:25 ` [PATCH v18 01/11] PCI/ERR: Update error status after reset_link() sathyanarayanan.kuppuswamy
2020-03-24  0:25 ` [PATCH v18 02/11] PCI: move {pciehp,shpchp}_is_native() definitions to pci.c sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 03/11] PCI/DPC: Fix DPC recovery issue in non hotplug case sathyanarayanan.kuppuswamy
2020-03-24 23:49   ` Bjorn Helgaas
2020-03-25  1:17     ` Kuppuswamy, Sathyanarayanan
2020-03-28 17:10       ` Bjorn Helgaas
2020-03-28 22:04         ` Kuppuswamy, Sathyanarayanan
2020-03-28 22:21           ` Bjorn Helgaas
2020-03-28 22:40             ` Kuppuswamy, Sathyanarayanan
2020-03-24  0:26 ` [PATCH v18 04/11] PCI/DPC: Move DPC data into struct pci_dev sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 05/11] PCI/ERR: Remove service dependency in pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-28 21:12   ` Kuppuswamy, Sathyanarayanan
2020-03-28 21:32     ` Bjorn Helgaas [this message]
2020-03-28 21:55       ` Kuppuswamy, Sathyanarayanan
2020-03-28 22:16         ` Bjorn Helgaas
2020-03-24  0:26 ` [PATCH v18 06/11] PCI/ERR: Return status of pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 07/11] PCI/DPC: Cache DPC capabilities in pci_init_capabilities() sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 08/11] PCI/AER: Add pci_aer_raw_clear_status() to unconditionally clear Error Status sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 09/11] PCI/DPC: Expose dpc_process_error(), dpc_reset_link() for use by EDR sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 10/11] PCI/DPC: Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-24 21:37   ` Bjorn Helgaas
2020-03-25  1:00     ` Kuppuswamy, Sathyanarayanan
2020-03-26 22:36       ` Bjorn Helgaas
2020-03-24  0:26 ` [PATCH v18 11/11] PCI/AER: Rationalize error status register clearing sathyanarayanan.kuppuswamy
2020-03-31 15:28 ` [PATCH v18 00/11] Add Error Disconnect Recover (EDR) support Bjorn Helgaas
2020-03-31 16:28   ` Kuppuswamy, Sathyanarayanan

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