linux-kernel - RE: [PATCH V2 5/5] tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <AS8PR04MB8404E8AD2739F5C2DD79ABBE920C9@AS8PR04MB8404.eurprd04.prod.outlook.com>
Date:   Wed, 23 Nov 2022 11:34:55 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Michael Walle <michael@...le.cc>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jirislaby@...nel.org" <jirislaby@...nel.org>,
        "jingchang.lu@...escale.com" <jingchang.lu@...escale.com>,
        "tomonori.sakita@...d.co.jp" <tomonori.sakita@...d.co.jp>,
        "atsushi.nemoto@...d.co.jp" <atsushi.nemoto@...d.co.jp>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 5/5] tty: serial: fsl_lpuart: clear LPUART Status
 Register in lpuart32_shutdown()



> -----Original Message-----
> From: Michael Walle <michael@...le.cc>
> Sent: 2022年11月23日 18:36
> To: Sherry Sun <sherry.sun@....com>
> Cc: gregkh@...uxfoundation.org; jirislaby@...nel.org;
> jingchang.lu@...escale.com; tomonori.sakita@...d.co.jp;
> atsushi.nemoto@...d.co.jp; linux-serial@...r.kernel.org; linux-
> kernel@...r.kernel.org; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH V2 5/5] tty: serial: fsl_lpuart: clear LPUART Status
> Register in lpuart32_shutdown()
> 
> Am 2022-11-10 09:17, schrieb Sherry Sun:
> > The LPUART Status Register needs to be cleared when closing the uart
> > port to get a clean environment when reopening the uart.
> 
> Shouldn't it be cleared on startup instead? What if there was some kind of
> event between shutdown and startup?
> 

Hi Michael, same as what we discussed under another patch, unfortunately the .startup() won’t clear the status of the uart port.

Best Regards
Sherry