linux-kernel - [PATCH 0/4] wifi: wilc1000: fix RCU usage

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Message-Id: <20240215-wilc_fix_rcu_usage-v1-0-f610e46c6f82@bootlin.com>
Date: Thu, 15 Feb 2024 16:36:17 +0100
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: linux-wireless@...r.kernel.org
Cc: Ajay Singh <ajay.kathat@...rochip.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, Kalle Valo <kvalo@...nel.org>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, 
 Alexis Lothoré <alexis.lothore@...tlin.com>
Subject: [PATCH 0/4] wifi: wilc1000: fix RCU usage

This small series aims to fix multiple warnings observed when enabling
CONFIG_PROVE_RCU_LIST:
- add missing locks to create corresponding critical read sections
- fix mix between RCU and SRCU API usage

While at it, since SRCU API is already in use in the driver, any fix done
on RCU usage was also done with the SRCU variant of RCU API. I do not
really get why we are using SRCU in this driver instead of classic RCU, as
it seems to be done in any other wireless driver. My understanding is that
primary SRCU use case is for compatibility with realtime kernel, which
needs to be preemptible everywhere. Has the driver been really developped
with this constraint in mind ?
If you have more details about this, feel free to educate me.

To: <linux-wireless@...r.kernel.org>
Cc: Ajay Singh <ajay.kathat@...rochip.com>
Cc: Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc: <linux-kernel@...r.kernel.org>

Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
---
Ajay Singh (1):
      wifi: wilc1000: add missing read critical sections around vif list traversal

Alexis Lothoré (3):
      wifi: wilc1000: split deeply nested RCU list traversal in dedicated helper
      wifi: wilc1000: use SRCU instead of RCU for vif list traversal
      wifi: wilc1000: fix declarations ordering

 drivers/net/wireless/microchip/wilc1000/cfg80211.c |  2 +-
 drivers/net/wireless/microchip/wilc1000/hif.c      | 70 ++++++++++++----------
 drivers/net/wireless/microchip/wilc1000/netdev.c   | 51 +++++++++-------
 drivers/net/wireless/microchip/wilc1000/netdev.h   |  6 ++
 drivers/net/wireless/microchip/wilc1000/wlan.c     |  2 +-
 5 files changed, 75 insertions(+), 56 deletions(-)
---
base-commit: f4adde5c2f875c491670bc19f6abae91ae364ed6
change-id: 20240131-wilc_fix_rcu_usage-e60ecdffee25

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