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Fri, 2 Oct 2026 14:05:36 +0000 (GMT) Received: from ltc.linux.ibm.com (unknown [9.5.196.140]) by smtpav04.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 2 Oct 2026 14:05:36 +0000 (GMT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Fri, 02 Oct 2026 09:05:36 -0500 From: Wen Xiong To: Michal Pecio 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 In-Reply-To: <20261002102931.3cb06009.michal.pecio@gmail.com> References: <20261001222527.11742-1-wenxiong@linux.ibm.com> <20261002102931.3cb06009.michal.pecio@gmail.com> Message-ID: <561d22493c3d078b26f547dd8f6f6f46@linux.ibm.com> X-Sender: wenxiong@linux.ibm.com Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: AjWKzsGLmIFYd485-Tz7BYwfpeoHqIu0 X-Proofpoint-GUID: EDpPcOpQdaBFLAdOJSob6hL50V7VPBJ- X-Proofpoint-Spam-Info: AW1haW4tMjYxMDAyMDA1NiBTYWx0ZWRfX/CsA1AJUlCoR TmKDiOArPdmnYlckMWE4GUvbrIB4Du1UvX6CzqyJFFGKTs3bFZewjeTT/xH93OcWvA6dxkNWjnp IgChjjLjrKkM1LFDxBAelgRFXuImde4= X-Authority-Analysis: v=2.4 cv=Vv62kO2n c=1 sm=1 tr=0 ts=6abfba32 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=Qr99yXs4eVAMDqtuwm8A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDAyMDA1NiBTYWx0ZWRfX/nIQur9SkSdB oaygbQi8gDXhiSmKV1z+U3P5aNZUi5A7ofKmS9ryH0mmRuaD4g9fnzwNNThC2wD5exbhPkw0qBA uoWp7tqB12GbfqBm0FB57kIzPOxazSUghRgfzHH/HXXA8Ea04bsWmk9+sXFeZCBMgP6sXbMnLKQ TtX9/lflgFNIJdksHNTy9Mjjg5g+DLStkxk8egLE2YpwPa6ymiBR6rrmg7agbalDdC4+L81LNX4 LdSlwqzaVT42i64RouA/jdZKmAAI0KDI1o+NcxE5MFKhmldDgscR6cCnjsbzVjuT/IkzlDdwDKA b80x67r2yqN6XJrZyr39MloT8yuuTj147CSRAORcBNFeVI3tfzFg/SDmPkdT0By1hxKET/tzYvO tJePze6C8EsVm69B2//28VvOFiX5IVuZzOzmcwBCy5LCCaExXCXKgIA3r038qZCNrrLtU0w0F0y 8WepLjnC944PWfZjPtQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-02_04,2026-10-01_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610020056 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. With a PCI reset, the USB controller is showed up after a kexec kernel. Thanks, Wendy