3.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Santos <daniel.san...@pobox.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.san...@pobox.com>
Signed-off-by: Mark Brown <broo...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/spi/spi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -600,7 +600,9 @@ 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;
}
}
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