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[91.219.240.8]) by smtp.gmail.com with ESMTPSA id t15-20020adfe44f000000b002f00793bd7asm1478740wrm.27.2023.04.20.02.30.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Apr 2023 02:30:06 -0700 (PDT) From: Vitaly Kuznetsov To: Bjorn Helgaas , Rob Herring Cc: Donald Hunter , Binbin Zhou , Liu Peibao , Huacai Chen , Jesse Brandeburg , Tony Nguyen , Andy Shevchenko , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, mstowe@redhat.com Subject: Re: [PATCH] PCI: Restrict device disabled status check to DT In-Reply-To: <20230419202042.GA223738@bhelgaas> References: <20230419202042.GA223738@bhelgaas> Date: Thu, 20 Apr 2023 11:30:04 +0200 Message-ID: <87leimnboj.fsf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Bjorn Helgaas writes: > [+cc Vitaly, Jesse, Tony, Andy, regressions, regarding reports of > hang or crash during boot in igb driver, some with AWS Xen] > > On Wed, Apr 19, 2023 at 02:35:13PM -0500, Rob Herring wrote: >> Commit 6fffbc7ae137 ("PCI: Honor firmware's device disabled status") >> checked the firmware device status for both DT and ACPI devices. That >> caused a regression in some ACPI systems. The exact reason isn't clear. >> It's possibly a firmware bug. For now, at least, refactor the check to >> be for DT based systems only. >> >> Note that the original implementation leaked a refcount which is now >> correctly handled. >> >> Fixes: 6fffbc7ae137 ("PCI: Honor firmware's device disabled status") >> Link: https://lore.kernel.org/all/m2fs9lgndw.fsf@gmail.com/ >> Reported-by: Donald Hunter >> Cc: Binbin Zhou >> Cc: Liu Peibao >> Cc: Huacai Chen >> Signed-off-by: Rob Herring > > Applied to for-linus for (hopefully) v6.3. I added: > > [bhelgaas: Per ACPI r6.5, sec 6.3.7, for devices on an enumerable > bus, _STA must return with bit[0] ("device is present") set] > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217317 > > It would be really great if anybody who has seen this issue could test > and report whether this patch solves it. > [Cc: Myron] I can confirm the patch fixes the issue I've reported with AWS Xen instances, so: Tested-by: Vitaly Kuznetsov -- Vitaly