linux-kernel - [PATCH v2 2/3] HID: logitech-hidpp: Retry commands when device is busy

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Date:   Mon,  6 Feb 2023 23:12:55 +0100
From:   Bastien Nocera <hadess@...ess.net>
To:     linux-input@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "Peter F . Patel-Schneider" <pfpschneider@...il.com>,
        Filipe Laíns <lains@...eup.net>,
        Nestor Lopez Casado <nlopezcasad@...itech.com>
Subject: [PATCH v2 2/3] HID: logitech-hidpp: Retry commands when device is busy

Handle the busy error coming from the device or receiver. The
documentation says a busy error can be returned when:
"
Device (or receiver) cannot answer immediately to this request
for any reason i.e:
- already processing a request from the same or another SW
- pipe full
"

Signed-off-by: Bastien Nocera <hadess@...ess.net>
---

Same as v1

 drivers/hid/hid-logitech-hidpp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 1952d8d3b6b2..9e94026de437 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -295,6 +295,7 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
 	 */
 	*response = *message;
 
+retry:
 	ret = __hidpp_send_report(hidpp->hid_dev, message);
 
 	if (ret) {
@@ -321,6 +322,10 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
 			response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
 			response->fap.feature_index == HIDPP20_ERROR) {
 		ret = response->fap.params[1];
+		if (ret == HIDPP20_ERROR_BUSY) {
+			dbg_hid("%s:got busy hidpp 2.0 error %02X, retrying\n", __func__, ret);
+			goto retry;
+		}
 		dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
 		goto exit;
 	}
-- 
2.39.1