linux-kernel - [PATCH v3 14/16] media: anysee: Fix and remove outdated comment

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Message-Id: <20241014-devel-anna-maria-b4-timers-flseep-v3-14-dc8b907cb62f@linutronix.de>
Date: Mon, 14 Oct 2024 10:22:31 +0200
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: Frederic Weisbecker <frederic@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Jonathan Corbet <corbet@....net>
Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, rust-for-linux@...r.kernel.org, 
 Alice Ryhl <aliceryhl@...gle.com>, 
 FUJITA Tomonori <fujita.tomonori@...il.com>, Andrew Lunn <andrew@...n.ch>, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Miguel Ojeda <ojeda@...nel.org>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
 linux-media@...r.kernel.org, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v3 14/16] media: anysee: Fix and remove outdated comment

anysee driver was transformed to use usbv2 years ago. The comments in
anysee_ctrl_msg() still are referencing the old interfaces where msleep()
was used. The v2 interfaces also changed over the years and with commit
1162c7b383a6 ("[media] dvb_usb_v2: refactor dvb_usbv2_generic_rw()") the
usage of msleep() was gone anyway.

Remove FIXME comment and update also comment before call to
dvb_usbv2_generic_rw_locked().

Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org
Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
v3: Remove FIXME comment completely
---
 drivers/media/usb/dvb-usb-v2/anysee.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/media/usb/dvb-usb-v2/anysee.c b/drivers/media/usb/dvb-usb-v2/anysee.c
index 8699846eb416..bea12cdc85e8 100644
--- a/drivers/media/usb/dvb-usb-v2/anysee.c
+++ b/drivers/media/usb/dvb-usb-v2/anysee.c
@@ -46,24 +46,15 @@ static int anysee_ctrl_msg(struct dvb_usb_device *d,

 	dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, slen, state->buf);

-	/* We need receive one message more after dvb_usb_generic_rw due
-	   to weird transaction flow, which is 1 x send + 2 x receive. */
+	/*
+	 * We need receive one message more after dvb_usbv2_generic_rw_locked()
+	 * due to weird transaction flow, which is 1 x send + 2 x receive.
+	 */
 	ret = dvb_usbv2_generic_rw_locked(d, state->buf, sizeof(state->buf),
 			state->buf, sizeof(state->buf));
 	if (ret)
 		goto error_unlock;

-	/* TODO FIXME: dvb_usb_generic_rw() fails rarely with error code -32
-	 * (EPIPE, Broken pipe). Function supports currently msleep() as a
-	 * parameter but I would not like to use it, since according to
-	 * Documentation/timers/timers-howto.rst it should not be used such
-	 * short, under < 20ms, sleeps. Repeating failed message would be
-	 * better choice as not to add unwanted delays...
-	 * Fixing that correctly is one of those or both;
-	 * 1) use repeat if possible
-	 * 2) add suitable delay
-	 */
-
 	/* get answer, retry few times if error returned */
 	for (i = 0; i < 3; i++) {
 		/* receive 2nd answer */

-- 
2.39.5