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spidev: fix hang when transfer_one_message fails

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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: ffbbdd2132 (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
This commit is contained in:
Daniel Santos 2014-01-05 17:39:26 -06:00 committed by Mark Brown
parent 6ce4eac1f6
commit e120cc0dcf
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi.c
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@ -735,7 +735,9 @@ 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;
}
}