linux-kernel - Re: [PATCH 1/3] usb: ucsi: Add missing ppm

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Date: Wed, 17 Jan 2024 06:44:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: "Christian A. Ehrhardt" <lk@...e.de>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	linux-usb@...r.kernel.org, Dell.Client.Kernel@...l.com,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Jack Pham <quic_jackp@...cinc.com>,
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
	Samuel Čavoj <samuel@...oj.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] usb: ucsi: Add missing ppm_lock

On Tue, Jan 16, 2024 at 11:40:39PM +0100, Christian A. Ehrhardt wrote:
> Calling ->sync_write must be done while holding the PPM lock as the
> mailbox logic does not support concurrent commands.
> 
> Thus protect the only call to ucsi_acknowledge_connector_change
> with the PPM lock as it calls ->sync_write. All other calls to
> ->sync_write already happen under the PPM lock.
> 
> Signed-off-by: Christian A. Ehrhardt <lk@...e.de>
> ---
> NOTE: This is not a theoretical issue. I've seen problems resulting
> from the missing lock on real hardware.

What commit id does this fix?

Should it be cc: stable?

thanks,

greg k-h