From: Daniel Santos <daniel.santos@pobox.com>
Date: Sun, 5 Jan 2014 23:39:26 +0000 (-0600)
Subject: spidev: fix hang when transfer_one_message fails
X-Git-Tag: v3.14-rc1~91^2~7^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e120cc0dcf2880a4c5c0a6cb27b655600a1cfa1d;p=pandora-kernel.git

spidev: fix hang when transfer_one_message fails

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>
Cc: stable@vger.kernel.org
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