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[3.13.y-ckt,26/90] spi: trigger trace event for message-done before mesg->complete

Message ID 1430859302-5886-27-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa May 5, 2015, 8:53 p.m. UTC 
3.13.11-ckt20 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>

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@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/spi/spi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a416aec..5fc2f0a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -829,13 +829,14 @@  void spi_finalize_current_message(struct spi_master *master)
 				"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);