tree 1060278b6895c6ff42c5962f3f5cd5a5ac006529
parent 6ce4eac1f600b34f2f7f58f9cd8f0503d79e42ae
author Daniel Santos <daniel.santos@pobox.com> 1388965166 -0600
committer Mark Brown <broonie@linaro.org> 1389012879 +0000

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