Re: [PATCH net v2] net: libwx: fix concurrent bitmap overwrite in PTP setup

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:

On Tue, 18 Aug 2026 15:47:21 +0800 you wrote:
> In wx_ptp_set_timestamp_mode(), the driver copies the global `wx->flags`
> bitmap to a local variable, modifies the PTP-related bits, and then writes
> the entire bitmap back using memcpy().
> 
> This Read-Copy-Update pattern is unsafe and introduces a critical race
> condition. Other asynchronous contexts (such as Tx timeout routines or
> GPIO IRQ handlers) update individual bits in `wx->flags` concurrently
> using atomic bitops like set_bit() or clear_bit(). The memcpy() write-back
> can silently overwrite and drop these concurrent changes, potentially
> causing the driver to miss critical module reset or PCIe recovery requests.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: libwx: fix concurrent bitmap overwrite in PTP setup
    https://git.kernel.org/netdev/net/c/f05516dd7b86

You are awesome, thank you!
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