This is a note to let you know that I've just added the patch titled
can: mcp251x: fix resume when device is down
to the 4.1-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-mcp251x-fix-resume-when-device-is-down.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 25b401c1816ae64bcc5dcb1d39ab41812522a0ce Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@xxxxxxxx>
Date: Mon, 18 May 2015 18:33:27 +0200
Subject: can: mcp251x: fix resume when device is down
From: Stefan Agner <stefan@xxxxxxxx>
commit 25b401c1816ae64bcc5dcb1d39ab41812522a0ce upstream.
If a valid power regulator or a dummy regulator is used (which
happens to be the case when no regulator is specified), restart_work
is queued no matter whether the device was running or not at suspend
time. Since work queues get initialized in the ndo_open callback,
resuming leads to a NULL pointer exception.
Reverse exactly the steps executed at suspend time:
- Enable the power regulator in any case
- Enable the transceiver regulator if the device was running, even in
case we have a power regulator
- Queue restart_work only in case the device was running
Fixes: bf66f3736a94 ("can: mcp251x: Move to threaded interrupts instead of workqueues.")
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/spi/mcp251x.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -1221,17 +1221,16 @@ static int __maybe_unused mcp251x_can_re
struct spi_device *spi = to_spi_device(dev);
struct mcp251x_priv *priv = spi_get_drvdata(spi);
- if (priv->after_suspend & AFTER_SUSPEND_POWER) {
+ if (priv->after_suspend & AFTER_SUSPEND_POWER)
mcp251x_power_enable(priv->power, 1);
+
+ if (priv->after_suspend & AFTER_SUSPEND_UP) {
+ mcp251x_power_enable(priv->transceiver, 1);
queue_work(priv->wq, &priv->restart_work);
} else {
- if (priv->after_suspend & AFTER_SUSPEND_UP) {
- mcp251x_power_enable(priv->transceiver, 1);
- queue_work(priv->wq, &priv->restart_work);
- } else {
- priv->after_suspend = 0;
- }
+ priv->after_suspend = 0;
}
+
priv->force_quit = 0;
enable_irq(spi->irq);
return 0;
Patches currently in stable-queue which might be from stefan@xxxxxxxx are
queue-4.1/can-mcp251x-fix-resume-when-device-is-down.patch
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