linux-kernel - Re: [PATCH v2 1/1] ucsi_ccg: Check DEV

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: <a8b185cb-3f4b-9d57-7eb5-7c09dd3bb5aa@nvidia.com>
Date:   Tue, 11 Jan 2022 14:15:17 +0000
From:   Wayne Chang <waynec@...dia.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Sing-Han Chen <singhanc@...dia.com>
Subject: Re: [PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting
 CCG4

Hi Greg,
Thanks for the review.

On 1/11/22 10:03 PM, Greg KH wrote:
> 
> 
> On Tue, Jan 11, 2022 at 09:36:43PM +0800, Wayne Chang wrote:
>> From: Sing-Han Chen <singhanc@...dia.com>
>>
>> after driver sending the UCSI_START cmd, CCGx would
>> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
>> reset successfully.
>>
>> however, there might be a chance that other bits in
>> INTR_REG are not cleared due to internal data queued
>> in PPM and cause the driver thinks CCGx reset failed.
>>
>> the commit checks bit 0 in INTR_REG and ignore other
>> bits. ucsi driver would reset PPM later.
>>
>> Signed-off-by: Sing-Han Chen <singhanc@...dia.com>
>> Signed-off-by: Wayne Chang <waynec@...dia.com>
>> ---
>>   drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> What commit id does this fix?
The change is to fix the defect of ucsi_ccg_init func based on the CCGx 
spec.
The original implementation's commit Id is i247c554a14aa1.

> thanks,
> 
> greg k-h
> 

thanks,
Wayne.