linux-kernel - [PATCH 3.5 36/88] spidev: fix hang when transfer_one

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Message-Id: <1391772205-22239-37-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  7 Feb 2014 11:22:33 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Daniel Santos <daniel.santos@...ox.com>,
	Mark Brown <broonie@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 36/88] spidev: fix hang when transfer_one_message fails

3.5.7.30 -stable review patch.  If anyone has any objections, please let me know.

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

From: Daniel Santos <daniel.santos@...ox.com>

commit e120cc0dcf2880a4c5c0a6cb27b655600a1cfa1d upstream.

This corrects a problem in spi_pump_messages() that leads to an spi
message hanging forever when a call to transfer_one_message() fails.
This failure occurs in my MCP2210 driver when the cs_change bit is set
on the last transfer in a message, an operation which the hardware does
not support.

Rationale
Since the transfer_one_message() returns an int, we must presume that it
may fail.  If transfer_one_message() should never fail, it should return
void.  Thus, calls to transfer_one_message() should properly manage a
failure.

Fixes: ffbbdd21329f3 (spi: create a message queueing infrastructure)
Signed-off-by: Daniel Santos <daniel.santos@...ox.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/spi/spi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 1041cb8..40f528b 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -574,7 +574,9 @@ static void spi_pump_messages(struct kthread_work *work)
 	ret = master->transfer_one_message(master, master->cur_msg);
 	if (ret) {
 		dev_err(&master->dev,
-			"failed to transfer one message from queue\n");
+			"failed to transfer one message from queue: %d\n", ret);
+		master->cur_msg->status = ret;
+		spi_finalize_current_message(master);
 		return;
 	}
 }
-- 
1.8.3.2

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