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[83.28.47.133]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48b380fada5sm5684961f8f.24.2026.10.02.07.18.31 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Fri, 02 Oct 2026 07:18:32 -0700 (PDT) Date: Fri, 2 Oct 2026 16:18:28 +0200 From: Michal Pecio To: Wen Xiong Cc: mathias.nyman@intel.com, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, wenxiong@us.ibm.com, Brian King , Samuel Mendoza-Jonas , Joel Stanley Subject: Re: [PATCH] xhci: Reset controller on xhci shutdown Message-ID: <20261002161828.365ff859.michal.pecio@gmail.com> In-Reply-To: <561d22493c3d078b26f547dd8f6f6f46@linux.ibm.com> References: <20261001222527.11742-1-wenxiong@linux.ibm.com> <20261002102931.3cb06009.michal.pecio@gmail.com> <561d22493c3d078b26f547dd8f6f6f46@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 02 Oct 2026 09:05:36 -0500, Wen Xiong wrote: > On 2026-10-02 03:29, Michal Pecio wrote: > > What exactly happens after kexec? > > Why a PCI reset in particular? > > Are we sure it's not a bug elsewhere? > > > After executing a kexec boots on a bare metal machine, the USB > controller disappeared. Sure, but what does it mean exactly? Not even showing up in lspci output? Is this our problem and not PCI subsystem's? Are we sure it's not a bug elsewhere? (Last time somebody reported issues with kexec, it turned out to be an obscure Intel IOMMU bug). Regards, Michal