spi: spi: Fix queue hang if previous transfer failed

The queue worker always needs to be kicked one final time after a transfer
is done in order to transition to idle (ctlr->busy = false).

Commit 69fa95905d40 ("spi: Ensure the io_mutex is held until
spi_finalize_current_message()") moved this code into
__spi_pump_messages(), but it was executed only if the transfer was
successful. This condition check causes ctlr-busy to stay true in case of
a failed transfer.
This in turn causes that no new work is ever scheduled to the work queue.

Fixes: 69fa95905d40 ("spi: Ensure the io_mutex is held until spi_finalize_current_message()")
Reported-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: David Jander <david@protonic.nl>
Link: https://lore.kernel.org/r/20220901123630.1098433-1-david@protonic.nl
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 5cbe090f76764f8a6e498f0a516b5ff9c8f7ea0d..f7852c2c186c45a6fe18dbeec32ffd492d0bcafb 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1727,8 +1727,7 @@ static void __spi_pump_messages(struct spi_controller *ctlr, bool in_kthread)
        spin_unlock_irqrestore(&ctlr->queue_lock, flags);
 
        ret = __spi_pump_transfer_message(ctlr, msg, was_busy);
-       if (!ret)
-               kthread_queue_work(ctlr->kworker, &ctlr->pump_messages);
+       kthread_queue_work(ctlr->kworker, &ctlr->pump_messages);
 
        ctlr->cur_msg = NULL;
        ctlr->fallback = false;