This is a note to let you know that I've just added the patch titled
spi: trigger trace event for message-done before mesg->complete
to the 3.19-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:
spi-trigger-trace-event-for-message-done-before-mesg-complete.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 391949b6f02121371e3d7d9082c6d17fd9853034 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@xxxxxxxxxxxxxx>
Date: Wed, 18 Mar 2015 11:27:28 +0100
Subject: spi: trigger trace event for message-done before mesg->complete
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From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@xxxxxxxxxxxxxx>
commit 391949b6f02121371e3d7d9082c6d17fd9853034 upstream.
With spidev the mesg->complete callback points to spidev_complete.
Calling this unblocks spidev_sync and so spidev_sync_write finishes. As
the struct spi_message just read is a local variable in
spidev_sync_write and recording the trace event accesses this message
the recording is better done first. The same can happen for
spidev_sync_read.
This fixes an oops observed on a 3.14-rt system with spidev activity
after
echo 1 > /sys/kernel/debug/tracing/events/spi/enable
.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1073,13 +1073,14 @@ void spi_finalize_current_message(struct
"failed to unprepare message: %d\n", ret);
}
}
+
+ trace_spi_message_done(mesg);
+
master->cur_msg_prepared = false;
mesg->state = NULL;
if (mesg->complete)
mesg->complete(mesg->context);
-
- trace_spi_message_done(mesg);
}
EXPORT_SYMBOL_GPL(spi_finalize_current_message);
Patches currently in stable-queue which might be from u.kleine-koenig@xxxxxxxxxxxxxx are
queue-3.19/clocksource-efm32-fix-a-null-pointer-dereference.patch
queue-3.19/spi-trigger-trace-event-for-message-done-before-mesg-complete.patch
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