RE: [Intel-wired-lan] [PATCH v2] idpf: disable PCIe PTM on probe failure and removal

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@xxxxxxxxxx> On Behalf
> Of Myeonghun Pak
> Sent: Wednesday, July 15, 2026 9:44 AM
> To: Nguyen, Anthony L <anthony.l.nguyen@xxxxxxxxx>; Kitszel,
> Przemyslaw <przemyslaw.kitszel@xxxxxxxxx>; intel-wired-
> lan@xxxxxxxxxxxxxxxx
> Cc: Olech, Milena <milena.olech@xxxxxxxxx>; Tantilov, Emil S
> <emil.s.tantilov@xxxxxxxxx>; Andrew Lunn <andrew+netdev@xxxxxxx>;
> David S . Miller <davem@xxxxxxxxxxxxx>; Eric Dumazet
> <edumazet@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo Abeni
> <pabeni@xxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; Myeonghun Pak <mhun512@xxxxxxxxx>; Ijae Kim
> <ae878000@xxxxxxxxx>
> Subject: [Intel-wired-lan] [PATCH v2] idpf: disable PCIe PTM on probe
> failure and removal
> 
> idpf_probe() enables PCIe Precision Time Measurement with
> pci_enable_ptm(pdev, NULL), which programs the PTM control bits and
> sets
> pdev->ptm_enabled when the bus/controller supports it.
> 
> If a later probe step fails, the error path releases the allocated
> workqueues and adapter memory without disabling PTM.  The remove path
> has the same imbalance when a successfully probed device is detached.
> In both cases, the PCI core's software PTM state and the device's PTM
> control bits remain set with no bound driver.
> 
> Add pci_disable_ptm() to the common probe unwind after the PTM enable
> and to idpf_remove().  pci_disable_ptm() is a no-op when PTM was not
> enabled, so the non-fatal pci_enable_ptm() failure remains safe.
> pcim_enable_device() only arranges for pci_disable_device() and does
> not undo the PTM enable.
> 
> Fixes: 8d5e12c5921c ("idpf: add initial PTP support")
> Co-developed-by: Ijae Kim <ae878000@xxxxxxxxx>
> Signed-off-by: Ijae Kim <ae878000@xxxxxxxxx>
> Signed-off-by: Myeonghun Pak <mhun512@xxxxxxxxx>
> ---
> Changes in v2:
> - Disable PTM in the probe error path, as requested by Emil Tantilov.
> 
>  drivers/net/ethernet/intel/idpf/idpf_main.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_main.c
> b/drivers/net/ethernet/intel/idpf/idpf_main.c
> index 0dd741dcfc..f08ce13c20 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_main.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_main.c
> @@ -159,6 +159,7 @@ static void idpf_remove(struct pci_dev *pdev)
>  	mutex_destroy(&adapter->queue_lock);
>  	mutex_destroy(&adapter->vc_buf_lock);
> 
> +	pci_disable_ptm(pdev);
>  	pci_set_drvdata(pdev, NULL);
>  	kfree(adapter);
>  }
> @@ -266,7 +267,7 @@ static int idpf_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
>  	if (err) {
>  		pci_err(pdev, "DMA configuration failed: %pe\n",
> ERR_PTR(err));
> 
> -		goto err_free;
> +		goto err_disable_ptm;
>  	}
> 
>  	pci_set_master(pdev);
> @@ -279,7 +280,7 @@ static int idpf_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
>  	if (!adapter->init_wq) {
>  		dev_err(dev, "Failed to allocate init workqueue\n");
>  		err = -ENOMEM;
> -		goto err_free;
> +		goto err_disable_ptm;
>  	}
> 
>  	adapter->serv_wq = alloc_workqueue("%s-%s-service", @@ -366,6
> +367,8 @@ err_mbx_wq_alloc:
>  	destroy_workqueue(adapter->serv_wq);
>  err_serv_wq_alloc:
>  	destroy_workqueue(adapter->init_wq);
> +err_disable_ptm:
> +	pci_disable_ptm(pdev);
>  err_free:
>  	kfree(adapter);
>  	return err;
> --
> 2.47.1

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>