ACK: [SRU][J/N:linux-bluefield][PATCH v5 0/1] mmc: core: Avoid bitfield RMW for claim/retune flags

[Masahiro Yamada]

On 3/18/26 00:36, Penghe Geng wrote:
> BugLink: https://bugs.launchpad.net/bugs/2143925
>
> SRU Justification:
>
> [Impact]
>
> The host->claimed bit shared a word with retune flags. Writes to claimed
> in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite
> other bits when concurrent updates happen in other contexts, triggering
> spurious WARN_ON(!host->claimed).
>
> [Fix]
>
> Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.
>
> [Test Case]
>
> * Boot BlueField-3 platform and verify that there are no instances of
>    "WARN_ON(!host->claimed)" call trace in dmesg log.
>
> [Regression Potential]
>
> None
>
> [Notes]
>
> This patch is already merged to the mainline.  The mainline commit is
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=901084c51a0a8fb42a3f37d2e9c62083c495f824
>
> Penghe Geng (1):
>    mmc: core: Avoid bitfield RMW for claim/retune flags
>
>   include/linux/mmc/host.h | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
>
> [ChangeLog]
>
> v2:
> - change title
> - add 'cherry picked from' line in commit message
>
> v3:
> - resend only, start a new thread
> - no content changes from v2
>
> v4:
> - relocate 'cherry picked from' line in commit message
>
> v5:
> - fix email threading with no content changes
>

Acked-by: Masahiro Yamada <masahiro.yamada at canonical.com>