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Wed, 27 May 2026 18:08:18 +0000 (GMT) Received: from li-3c92a0cc-27cf-11b2-a85c-b804d9ca68fa.ibm.com (unknown [9.124.220.41]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 27 May 2026 18:08:18 +0000 (GMT) From: Aditya Gupta To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan , Timothy Pearson , Bjorn Helgaas , Shawn Anastasio Cc: sashiko-bot@kernel.org, linux-pci@vger.kernel.org, Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" Subject: [PATCH v2 0/3] ppc/pnv: Fix panics and refactor pnv_php.c Date: Wed, 27 May 2026 23:38:13 +0530 Message-ID: <20260527180816.2749186-1-adityag@linux.ibm.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: ZahQOOm8zkH4eWS-r5JH1W7QD0QFF9rc X-Authority-Analysis: v=2.4 cv=Sq2gLvO0 c=1 sm=1 tr=0 ts=6a17331b cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=19T7HI5kWQHWw3tJfkgA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTI3MDE4MiBTYWx0ZWRfX1pCvED0rGHRZ M4oSgjofiwDOuTw4tWitjmN9aLcKYJOmLF7abWijjHrM7iwu8FQMqdvFvzny25FxxLCJ2v/SffD XPktyDlBcpX4ckyUpuYjSfmR78h7iaax9iDyb/kK2F78e2F2j6ng6lyZX1TXe5cUzqKLdBqCvzS ZqpePIJaKqPuV8k7oIQ1/ROBhZgPl3VRD3I0ZPSFvOvsjWgHShoY7ZBzSYcPq/qvTKCDf8UPNDn BG5TQzIHHJQwATNZ+DoFzWcwBXsNogSG4YHNSXt5tkZ5bz2cgL6ya8eQiMHovuChb0JpCuJz2SA SBEVTiDlihCBdmfTA62Vz4yPtXKsg/22J34DsTC9xwFTijuO+VTaRsGvGeApxdcMbzj7ySd9DvS uTzNCQ2lpYGjaxXzF5H0b0a6xLNENPzNz/h7nAu5haNwUHWDzGtuFF84dRmj6e9uCwNuqF2FwKM 59j64KEZAcmgTApyDDg== X-Proofpoint-ORIG-GUID: Fo607T0LaHRznho-UTTfhKIGl523Cfnf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-05-27_03,2026-05-26_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 phishscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 clxscore=1011 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605270182 Overview ======== Since below upstream commit, powernv systems get a panic during boot when an OpenCAPI hotplug slot is detected: commit 80f9fc2362797538ebd4fd70a1dfa838cc2c2cdb Date: Tue Jul 15 16:36:55 2025 -0500 PCI: pnv_php: Work around switches with broken presence detection The panic log is present in patch #1 Patch #1: Adds null checks around null pointer dereferences Patch #2: Rework the driver code to separate PCIe-specific and common code Patch #3 (optional): Group PCIe functionality together, only code movements Note: Patch 1 is important and independent of the other patches Note2: Patch 2 & 3 can be squashed into 1 commit. Intentionally kept patch #2 as small as possible for ease of review. Changelog ========= v1 -> v2: * Sashiko pointed out various null pointer dereferences including a kernel panic triggered by userspace, fixed them * Add rework patches, so that PCIe-specific and common code can be separated cleanly Aditya Gupta (3): ppc/pnv: Add null checks for OpenCapi PHBs ppc/pnv: Refactor PNV PCI hotplug driver ppc/pnv: Refactor PNV PCI Hotplug to group PCIe functions arch/powerpc/include/asm/pnv-pci.h | 16 + drivers/pci/hotplug/pnv_php.c | 554 ++++++++++++++++------------- 2 files changed, 328 insertions(+), 242 deletions(-) -- 2.54.0