[PATCH 5.4 277/320] Documentation: dmaengine: Correctly describe dmatest with channel unset

Greg Kroah-Hartman
2022-01-25T03:23:58Z

From: Daniel Thompson <daniel.thompson@linaro.org>

commit c61d7b2ef141abf81140756b45860a2306f395a2 upstream.

Currently the documentation states that channels must be configured before
running the dmatest. This has not been true since commit 6b41030fdc79
("dmaengine: dmatest: Restore default for channel"). Fix accordingly.

Fixes: 6b41030fdc79 ("dmaengine: dmatest: Restore default for channel")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20211118100952.27268-3-daniel.thompson@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Documentation/driver-api/dmaengine/dmatest.rst | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/Documentation/driver-api/dmaengine/dmatest.rst
+++ b/Documentation/driver-api/dmaengine/dmatest.rst
@@ -143,13 +143,14 @@ Part 5 - Handling channel allocation
Allocating Channels
-------------------

-Channels are required to be configured prior to starting the test run.
-Attempting to run the test without configuring the channels will fail.
+Channels do not need to be configured prior to starting a test run. Attempting
+to run the test without configuring the channels will result in testing any
+channels that are available.

Example::

% echo 1 > /sys/module/dmatest/parameters/run
- dmatest: Could not start test, no channels configured
+ dmatest: No channels configured, continue with any

Channels are registered using the "channel" parameter. Channels can be requested by their
name, once requested, the channel is registered and a pending thread is added to the test list.