Re: Patch "igc: fix a log entry using uninitialized netdev" has been added to the 6.9-stable tree

[Corinna Vinschen <vinschen@redhat.com>]

Hi Sasha,

my patch should not go into the stable branches.  Under certain
circumstances it triggered kernel crashes.

Consequentially this patch has been reverted in the main
development branch:

  8eef5c3cea65 Revert "igc: fix a log entry using uninitialized netdev"

So I suggest to remove my patch 86167183a17e from the stable branches or
apply 8eef5c3cea65 as well.


Sorry and thanks,
Corinna


On Jul  5 15:29, Sasha Levin wrote:
> This is a note to let you know that I've just added the patch titled
> 
>     igc: fix a log entry using uninitialized netdev
> 
> to the 6.9-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      igc-fix-a-log-entry-using-uninitialized-netdev.patch
> and it can be found in the queue-6.9 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
> 
> commit ee112b3c8929ec718b444134db87e1c585eb7d70
> Author: Corinna Vinschen <vinschen@redhat.com>
> Date:   Tue Apr 23 12:24:54 2024 +0200
> 
>     igc: fix a log entry using uninitialized netdev
>     
>     [ Upstream commit 86167183a17e03ec77198897975e9fdfbd53cb0b ]
>     
>     During successful probe, igc logs this:
>     
>     [    5.133667] igc 0000:01:00.0 (unnamed net_device) (uninitialized): PHC added
>                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>     The reason is that igc_ptp_init() is called very early, even before
>     register_netdev() has been called. So the netdev_info() call works
>     on a partially uninitialized netdev.
>     
>     Fix this by calling igc_ptp_init() after register_netdev(), right
>     after the media autosense check, just as in igb.  Add a comment,
>     just as in igb.
>     
>     Now the log message is fine:
>     
>     [    5.200987] igc 0000:01:00.0 eth0: PHC added
>     
>     Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
>     Reviewed-by: Hariprasad Kelam <hkelam@marvell.com>
>     Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
>     Tested-by: Naama Meir <naamax.meir@linux.intel.com>
>     Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
>     Signed-off-by: Sasha Levin <sashal@kernel.org>
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index 58bc96021bb4c..07feb951be749 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -6932,8 +6932,6 @@ static int igc_probe(struct pci_dev *pdev,
>  	device_set_wakeup_enable(&adapter->pdev->dev,
>  				 adapter->flags & IGC_FLAG_WOL_SUPPORTED);
>  
> -	igc_ptp_init(adapter);
> -
>  	igc_tsn_clear_schedule(adapter);
>  
>  	/* reset the hardware with the new settings */
> @@ -6955,6 +6953,9 @@ static int igc_probe(struct pci_dev *pdev,
>  	/* Check if Media Autosense is enabled */
>  	adapter->ei = *ei;
>  
> +	/* do hw tstamp init after resetting */
> +	igc_ptp_init(adapter);
> +
>  	/* print pcie link status and MAC address */
>  	pcie_print_link_status(pdev);
>  	netdev_info(netdev, "MAC: %pM\n", netdev->dev_addr);