linux-kernel - [PATCH] Documentation: firmware: Clarify firmware path usage

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Date:   Sun,  2 Apr 2023 06:54:14 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org (open list:DOCUMENTATION)
Subject: [PATCH] Documentation: firmware: Clarify firmware path usage

Newline characters will be taken into account for the firmware search
path parameter, warn users about that and provide an example using 'echo
-n' such that it clarifies the typical use of that parameter.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 Documentation/driver-api/firmware/fw_search_path.rst | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/driver-api/firmware/fw_search_path.rst b/Documentation/driver-api/firmware/fw_search_path.rst
index a360f1009fa3..d7cb1e8f0076 100644
--- a/Documentation/driver-api/firmware/fw_search_path.rst
+++ b/Documentation/driver-api/firmware/fw_search_path.rst
@@ -22,5 +22,10 @@ can use the file:
 
 * /sys/module/firmware_class/parameters/path
 
-You would echo into it your custom path and firmware requested will be
-searched for there first.
+You would echo into it your custom path and firmware requested will be searched
+for there first. Be aware that newline characters will be taken into account
+and may not produce the intended effects. For instance you might want to use:
+
+echo -n /path/to/script > /sys/module/firmware_class/parameters/path
+
+to ensure that your script is being used.
-- 
2.25.1