Alexis LothoréandGreg Kroah-Hartman b92ec4a848 net: stmmac: make sure that ptp_rate is not 0 before configuring EST ...

commit cbefe2ffa7 upstream.

If the ptp_rate recorded earlier in the driver happens to be 0, this
bogus value will propagate up to EST configuration, where it will
trigger a division by 0.

Prevent this division by 0 by adding the corresponding check and error
code.

Suggested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Fixes: 8572aec3d0 ("net: stmmac: Add basic EST support for XGMAC")
Link: https://patch.msgid.link/20250529-stmmac_tstamp_div-v4-2-d73340a794d5@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ The context change is due to the commit c3f3b97238
  ("net: stmmac: Refactor EST implementation")
  which is irrelevant to the logic of this patch. ]
Signed-off-by: Rahul Sharma <black.hawk@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-01-11 15:22:32 +01:00

..

stmmac

net: stmmac: make sure that ptp_rate is not 0 before configuring EST

2026-01-11 15:22:32 +01:00

Kconfig

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Makefile

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