netdev - [PATCH AUTOSEL 6.9 23/35] net: dsa: realtek: do not assert reset on remove

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Message-ID: <20240527141214.3844331-23-sashal@kernel.org>
Date: Mon, 27 May 2024 10:11:28 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Luiz Angelo Daros de Luca <luizluca@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	alsi@...g-olufsen.dk,
	andrew@...n.ch,
	f.fainelli@...il.com,
	olteanv@...il.com,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.9 23/35] net: dsa: realtek: do not assert reset on remove

From: Luiz Angelo Daros de Luca <luizluca@...il.com>

[ Upstream commit 4f580e9aced1816398c1c64f178302a22b8ea6e2 ]

The necessity of asserting the reset on removal was previously
questioned, as DSA's own cleanup methods should suffice to prevent
traffic leakage[1].

When a driver has subdrivers controlled by devres, they will be
unregistered after the main driver's .remove is executed. If it asserts
a reset, the subdrivers will be unable to communicate with the hardware
during their cleanup. For LEDs, this means that they will fail to turn
off, resulting in a timeout error.

[1] https://lore.kernel.org/r/20240123215606.26716-9-luizluca@gmail.com/

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/realtek/rtl83xx.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/realtek/rtl83xx.c b/drivers/net/dsa/realtek/rtl83xx.c
index d2e876805393b..a9c1702431efb 100644
--- a/drivers/net/dsa/realtek/rtl83xx.c
+++ b/drivers/net/dsa/realtek/rtl83xx.c
@@ -290,16 +290,13 @@ EXPORT_SYMBOL_NS_GPL(rtl83xx_shutdown, REALTEK_DSA);
  * rtl83xx_remove() - Cleanup a realtek switch driver
  * @priv: realtek_priv pointer
  *
- * If a method is provided, this function asserts the hard reset of the switch
- * in order to avoid leaking traffic when the driver is gone.
+ * Placehold for common cleanup procedures.
  *
- * Context: Might sleep if priv->gdev->chip->can_sleep.
+ * Context: Any
  * Return: nothing
  */
 void rtl83xx_remove(struct realtek_priv *priv)
 {
-	/* leave the device reset asserted */
-	rtl83xx_reset_assert(priv);
 }
 EXPORT_SYMBOL_NS_GPL(rtl83xx_remove, REALTEK_DSA);
 
-- 
2.43.0