linux-kernel - [PATCH v3 0/2] net: stmmac: prevent div by 0

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Message-Id: <20250528-stmmac_tstamp_div-v3-0-b525ecdfd84c@bootlin.com>
Date: Wed, 28 May 2025 10:29:49 +0200
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jose Abreu <joabreu@...opsys.com>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Phil Reid <preid@...ctromag.com.au>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Jose Abreu <Jose.Abreu@...opsys.com>, 
 Alexis Lothoré <alexis.lothore@...tlin.com>
Subject: [PATCH v3 0/2] net: stmmac: prevent div by 0

Hello,
this small series aims to fix a small splat I am observing on a STM32MP157
platform at boot (see commit 1) due to a division by 0. This new
revision add the same check in another code path possibly affected by
the same issue, as discussed in v2.

Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
---
Changes in v3:
- remove now duplicate check
- add ptp_rate check in est_configure
- Link to v2: https://lore.kernel.org/r/20250527-stmmac_tstamp_div-v2-1-663251b3b542@bootlin.com

Changes in v2:
- Add Fixes tag
- Reword commit message to clarify the triggering cause of the issue
- Link to v1: https://lore.kernel.org/r/20250523-stmmac_tstamp_div-v1-1-bca8a5a3a477@bootlin.com

---
Alexis Lothoré (2):
      net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping
      net: stmmac: make sure that ptp_rate is not 0 before configuring EST

 drivers/net/ethernet/stmicro/stmmac/stmmac_est.c  | 5 +++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c  | 2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)
---
base-commit: e0e2f78243385e7188a57fcfceb6a19f723f1dff
change-id: 20250522-stmmac_tstamp_div-f55112f06029

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com