Sebastian Andrzej Siewior d6ec2f711c net: dsa: xrs700x: Use irqsave variant for u64 stats update ... [ Upstream commit 3f8ae9fe04 ] xrs700x_read_port_counters() updates the stats from a worker using the u64_stats_update_begin() version. This is okay on 32-UP since on the reader side preemption is disabled. On 32bit-SMP the writer can be preempted by the reader at which point the reader will spin on the seqcount until writer continues and completes the update. Assigning the mib_mutex mutex to the underlying seqcount would ensure proper synchronisation. The API for that on the u64_stats_init() side isn't available. Since it is the only user, just use disable interrupts during the update. Use u64_stats_update_begin_irqsave() on the writer side to ensure an uninterrupted update. Fixes: ee00b24f32 ("net: dsa: add Arrow SpeedChips XRS700x driver") Cc: Andrew Lunn <andrew@lunn.ch> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: George McCollister <george.mccollister@gmail.com> Cc: Vivien Didelot <vivien.didelot@gmail.com> Cc: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: George McCollister <george.mccollister@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-09-08 12:28:02 +02:00
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Kconfig	…
Makefile	…
xrs700x.c	net: dsa: xrs700x: Use irqsave variant for u64 stats update	2022-09-08 12:28:02 +02:00
xrs700x.h	net: dsa: xrs700x: be compatible with masters which unregister on shutdown	2021-09-19 12:08:37 +01:00
xrs700x_i2c.c	net: dsa: xrs700x: be compatible with masters which unregister on shutdown	2021-09-19 12:08:37 +01:00
xrs700x_mdio.c	net: dsa: xrs700x: be compatible with masters which unregister on shutdown	2021-09-19 12:08:37 +01:00
xrs700x_reg.h	net: dsa: xrs700x: add HSR offloading support	2021-02-11 13:24:45 -08:00