From: Willy Tarreau <w@1wt.eu>
To: Johan Hovold <johan@kernel.org>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
"Paul Größel" <pb.g@gmx.de>,
stable@vger.kernel.org
Subject: Re: [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates"
Date: Tue, 24 Aug 2021 14:32:32 +0200 [thread overview]
Message-ID: <20210824123232.GA25435@1wt.eu> (raw)
In-Reply-To: <20210824121926.19311-1-johan@kernel.org>
On Tue, Aug 24, 2021 at 02:19:26PM +0200, Johan Hovold wrote:
> This reverts commit 3c18e9baee0ef97510dcda78c82285f52626764b.
>
> These devices do not appear to send a zero-length packet when the
> transfer size is a multiple of the bulk-endpoint max-packet size. This
> means that incoming data may not be processed by the driver until a
> short packet is received or the receive buffer is full.
>
> Revert back to using endpoint-sized receive buffers to avoid stalled
> reads.
Sorry for this, I didn't notice any issue here (aside for the chip
working where it used not to). I have no idea what these zero-length
packets correspond to, nor why they're affected by the transfer size.
Do you have any idea what I should look for ? Because without that
patch, the device is unusable for me :-/
Thanks!
Willy
next prev parent reply other threads:[~2021-08-24 12:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 12:19 [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates" Johan Hovold
2021-08-24 12:32 ` Willy Tarreau [this message]
2021-08-24 13:25 ` Johan Hovold
2021-08-24 15:06 ` Willy Tarreau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210824123232.GA25435@1wt.eu \
--to=w@1wt.eu \
--cc=johan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=pb.g@gmx.de \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).