Re: [PATCH net v2] igb: initialize PTP state before registering PHC

[Simon Horman <horms@kernel.org>]

On Thu, Sep 17, 2026 at 11:02:47PM +0800, Runyu Xiao wrote:
> igb_ptp_init() currently initializes the PTP lock, work items,
> timestamp configuration, and timecounter after ptp_clock_register().
> The PHC is published by that call, so PTP callbacks and timestamp
> interrupts can run before those objects are ready.
> 
> Initialize the complete PTP state before registering the PHC. Skip the
> setup when CONFIG_PTP_1588_CLOCK is disabled, since the PTP registration
> helper is then a no-op. If PHC registration fails, cancel the work items
> queued by igb_ptp_reset() or a timestamp interrupt before returning.
> 
> Fixes: b888c510f7b3 ("igb: Avoid starting unnecessary workqueues")
> Cc: stable@vger.kernel.org
> Link: https://lore.kernel.org/netdev/20260830154912.2712900-1-runyu.xiao@seu.edu.cn/
> Assisted-by: LLM
> Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
> 
> ---
> v2:
> - Restore all PTP state initialization before PHC registration.
> - Skip PTP setup when CONFIG_PTP_1588_CLOCK is disabled.
> - Cancel both PTP work items when PHC registration fails.

Reviewed-by: Simon Horman <horms@kernel.org>

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Thanks!