Re: [PATCH v2] atm/fore200e: Fix possible data race in fore200e_open()

Jakub Kicinski
2025-01-23T15:12:03Z

On Wed, 22 Jan 2025 02:37:45 +0000 Gui-Dong Han wrote:
> Protect access to fore200e->available_cell_rate with rate_mtx lock to
> prevent potential data race.
>
> In this case, since the update depends on a prior read, a data race
> could lead to a wrong fore200e.available_cell_rate value.
>
> The field fore200e.available_cell_rate is generally protected by the lock
> fore200e.rate_mtx when accessed. In all other read and write cases, this
> field is consistently protected by the lock, except for this case and
> during initialization.

Please describe the call paths which interact to cause the race.