Commit 8a158ac1ceec for kernel

commit 8a158ac1ceec48f2aebdd3fd670c20770b829fc1
Merge: 47fa679db171 77a9ebe8818c
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Wed Jul 29 17:30:19 2026 -0700

    Merge branch 'net-dsa-mt7530-fix-swallowed-mdio-read-errors'

    Daniel Golle says:

    ====================
    net: dsa: mt7530: fix swallowed MDIO read errors

    While working on a register access cleanup for the mt7530 driver, the
    Sashiko AI reviewers flagged long-standing error handling gaps in the
    driver's read paths [1].

    The MDIO regmap backend truncates negative bus->read() errnos into u16
    register halves and returns success, handing garbage data to callers
    and to read-modify-write cycles which then write it back to the switch.

    The ATC/VTCR command polls and the MT7531 indirect PHY polls consume
    reads through a helper which returns 0 when the underlying read fails.
    A failed bus transaction thus clears the polled busy bit and is
    mistaken for command completion, defeats the subsequent
    ATC_INVALID/VTCR_INVALID checks the same way, and lets the indirect
    PHY access functions return garbage PHY register data.

    Fix the backend to propagate bus->read() errors, and convert the
    command and PHY access polls to regmap_read_poll_timeout(), which
    terminates polling on read errors and propagates them.

    The cleanup series depending on these fixes will be submitted to
    net-next separately after the next net/net-next merger.

    [1] https://lore.kernel.org/netdev/cover.1784481922.git.daniel@makrotopia.org/
    ====================

    Link: https://patch.msgid.link/cover.1785213071.git.daniel@makrotopia.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>