net: stmmac: initialize ptp_lock at probe time

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priv->ptp_lock is only initialized in stmmac_ptp_register(), which runs
during __stmmac_open(). However, the lock is also used while the
interface is down and has never been opened: tc_taprio_configure()
invokes the PTP gettime64() callback to compute the EST base time when
offloading a TAPRIO schedule, and stmmac_get_time() takes
priv->ptp_lock. Using an uninitialized rwlock is undefined behaviour.
Move the rwlock_init() to __stmmac_dvr_probe(), together with the other
private locks, so that ptp_lock is always valid regardless of the
interface state.

Fixes: b60189e039 ("net: stmmac: Integrate EST with TAPRIO scheduler API")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260904-stmmac-fix-ptp-clock-init-v1-1-df70eb1eb04d@oss.qualcomm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Lorenzo Bianconi 2026-09-04 12:32:55 +02:00 • committed by Jakub Kicinski

parent 113998aa37

commit 0338c68e22

2 changed files with 1 additions and 1 deletions

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1

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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1

drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c

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