mirror of https://github.com/hak5/openwrt.git
41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From b68b4448dc37e5fd510f1bb9bbd62722ad497f41 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Santos <daniel.santos@pobox.com>
|
|
Date: Sun, 5 Jan 2014 17:39:26 -0600
|
|
Subject: [PATCH 168/174] spidev: fix hang when transfer_one_message fails
|
|
|
|
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@pobox.com>
|
|
Signed-off-by: Mark Brown <broonie@linaro.org>
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
---
|
|
drivers/spi/spi.c | 4 +++-
|
|
1 file changed, 3 insertions(+), 1 deletion(-)
|
|
|
|
--- a/drivers/spi/spi.c
|
|
+++ b/drivers/spi/spi.c
|
|
@@ -584,7 +584,9 @@ static void spi_pump_messages(struct kth
|
|
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;
|
|
}
|
|
}
|