This is a note to let you know that I've just added the patch titled
can: m_can: m_can_close(): stop clocks after device has been shut down
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-m_can-m_can_close-stop-clocks-after-device-has-b.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bd3e370187017f258d10b978587d652ca5d89f30
Author: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Date: Mon Sep 9 15:07:41 2024 +0200
can: m_can: m_can_close(): stop clocks after device has been shut down
[ Upstream commit 2c09b50efcad985cf920ca88baa9aa52b1999dcc ]
After calling m_can_stop() an interrupt may be pending or NAPI might
still be executed. This means the driver might still touch registers
of the IP core after the clocks have been disabled. This is not good
practice and might lead to aborts depending on the SoC integration.
To avoid these potential problems, make m_can_close() symmetric to
m_can_open(), i.e. stop the clocks at the end, right before shutting
down the transceiver.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Link: https://patch.msgid.link/20240910-can-m_can-fix-ifup-v3-2-6c1720ba45ce@xxxxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 66221fdf785f8..97666a7595959 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1600,7 +1600,6 @@ static int m_can_close(struct net_device *dev)
netif_stop_queue(dev);
m_can_stop(dev);
- m_can_clk_stop(cdev);
free_irq(dev->irq, dev);
if (cdev->is_peripheral) {
@@ -1614,6 +1613,7 @@ static int m_can_close(struct net_device *dev)
close_candev(dev);
+ m_can_clk_stop(cdev);
phy_power_off(cdev->transceiver);
return 0;
