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[157.230.128.187]) by smtp.gmail.com with ESMTPSA id q62sm4723143pfc.132.2020.05.11.07.13.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2020 07:13:27 -0700 (PDT) Received: by 42.do-not-panic.com (Postfix, from userid 1000) id 0DB6940605; Mon, 11 May 2020 14:13:27 +0000 (UTC) Date: Mon, 11 May 2020 14:13:27 +0000 From: Luis Chamberlain To: Shannon Nelson Cc: Andrew Lunn , jeyu@kernel.org, akpm@linux-foundation.org, arnd@arndb.de, rostedt@goodmis.org, mingo@redhat.com, aquini@redhat.com, cai@lca.pw, dyoung@redhat.com, bhe@redhat.com, peterz@infradead.org, tglx@linutronix.de, gpiccoli@canonical.com, pmladek@suse.com, tiwai@suse.de, schlad@suse.de, andriy.shevchenko@linux.intel.com, keescook@chromium.org, daniel.vetter@ffwll.ch, will@kernel.org, mchehab+samsung@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 00/15] net: taint when the device driver firmware crashes Message-ID: <20200511141326.GQ11244@42.do-not-panic.com> References: <20200509043552.8745-1-mcgrof@kernel.org> <1e097eb0-6132-f549-8069-d13b678183f5@pensando.io> <20200510015814.GE362499@lunn.ch> <01831b19-5890-e7e0-3801-068dfab5c92a@pensando.io> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <01831b19-5890-e7e0-3801-068dfab5c92a@pensando.io> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, May 09, 2020 at 07:15:23PM -0700, Shannon Nelson wrote: > On 5/9/20 6:58 PM, Andrew Lunn wrote: > > On Sat, May 09, 2020 at 06:01:51PM -0700, Shannon Nelson wrote: > > As for firmware, how much damage can the firmware do as it crashed? If > > it is a DMA master, it could of splattered stuff through > > memory. Restarting the firmware is not going to reverse the damage it > > has done. > > > True, and tho' the driver might get the thing restarted, it wouldn't > necessarily know what kind of damage had ensued. Indeed, it is those uknowns which we currently assume is just fine, but in reality can be damaging. Today we just move on with life, but such information is useful for analysis. Luis