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From: "Kuppuswamy, Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Bjorn Helgaas <helgaas@kernel.org>
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 14:55:50 -0700
Message-ID: <110653ad-fd8f-8047-62de-dd9ce2cb9d5f@linux.intel.com> (raw)
In-Reply-To: <20200328213241.GA127815@google.com>

Hi Bjorn,

On 3/28/20 2:32 PM, Bjorn Helgaas wrote:
> 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.
But the documentation says "If reset_link is not NULL, recovery function
will use it to reset the link." It considers NULL as a possible case.
So I think its better to allow that case with a pci_warn() message.
> 
> 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
2020-03-28 21:55       ` Kuppuswamy, Sathyanarayanan [this message]
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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