From: Oliver Neukum <oneukum@suse.com>
To: Johan Hovold <johan@kernel.org>, Oliver Neukum <oneukum@suse.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] USB: cdc-acm: fix racy TIOCMIWAIT implementation
Date: Mon, 7 Sep 2026 10:17:38 +0200 [thread overview]
Message-ID: <e231a7e9-7aa9-40ea-8ac6-57855b4ac811@suse.com> (raw)
In-Reply-To: <20260907065501.101013-1-johan@kernel.org>
On 07.09.26 08:55, Johan Hovold wrote:
> The wakeup condition needs to be checked after adding the task to the
> waitqueue and updating the task state to avoid missing a racing modem
> status update or disconnect.
I am sorry, but in this case I have to ask:
Isn't TIOCMIWAIT inherently racy against the hardware?
Regards
Oliver
next prev parent reply other threads:[~2026-09-07 8:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 6:55 [PATCH] USB: cdc-acm: fix racy TIOCMIWAIT implementation Johan Hovold
2026-09-07 8:17 ` Oliver Neukum [this message]
2026-09-07 8:47 ` Johan Hovold
2026-09-07 9:13 ` Johan Hovold
2026-09-07 9:50 ` Oliver Neukum
2026-09-07 10:01 ` Johan Hovold
2026-09-07 10:28 ` Oliver Neukum
2026-09-07 11:38 ` Johan Hovold
2026-09-07 12:46 ` Oliver Neukum
2026-09-07 13:03 ` Johan Hovold
2026-09-08 6:54 ` Oliver Neukum
2026-09-08 7:12 ` Johan Hovold
2026-09-08 9:23 ` Oliver Neukum
2026-09-11 6:57 ` Johan Hovold
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