netdev - Re: [PATCH net-next v4 5/6] net: ravb: Do not apply features to hardware if the interface is down

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]

Date: Wed, 14 Feb 2024 20:07:20 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<biju.das.jz@...renesas.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v4 5/6] net: ravb: Do not apply features to
 hardware if the interface is down

On 2/14/24 4:57 PM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Do not apply features to hardware if the interface is down. In case runtime
> PM is enabled, and while the interface is down, the IP will be in reset
> mode (as for some platforms disabling the clocks will switch the IP to
> reset mode, which will lead to losing register contents) and applying
> settings in reset mode is not an option. Instead, cache the features and
> apply them in ravb_open() through ravb_emac_init().
> 
> To avoid accessing the hardware while the interface is down
> pm_runtime_active() check was introduced. Along with it the device runtime
> PM usage counter has been incremented to avoid disabling the device clocks
> while the check is in progress (if any).
> 
> Commit prepares for the addition of runtime PM.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

MBR, Sergey