From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35298 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932679AbeB1P3m (ORCPT ); Wed, 28 Feb 2018 10:29:42 -0500 Subject: Patch "powerpc/pseries: Make RAS IRQ explicitly dependent on DLPAR WQ" has been added to the 4.14-stable tree To: mpe@ellerman.id.au, alexander.levin@verizon.com, danielhb@linux.vnet.ibm.com, david@gibson.dropbear.id.au, gregkh@linuxfoundation.org, joserz@linux.vnet.ibm.com, mdeng@redhat.com Cc: , From: Date: Wed, 28 Feb 2018 16:26:59 +0100 Message-ID: <1519831619145229@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled powerpc/pseries: Make RAS IRQ explicitly dependent on DLPAR WQ to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-pseries-make-ras-irq-explicitly-dependent-on-dlpar-wq.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Wed Feb 28 16:23:28 CET 2018 From: Michael Ellerman Date: Mon, 8 Jan 2018 14:54:32 +1100 Subject: powerpc/pseries: Make RAS IRQ explicitly dependent on DLPAR WQ From: Michael Ellerman [ Upstream commit e2d5915293ffdff977ddcfc12b817b08c53ffa7a ] The hotplug code uses its own workqueue to handle IRQ requests (pseries_hp_wq), however that workqueue is initialized after init_ras_IRQ(). That can lead to a kernel panic if any hotplug interrupts fire after init_ras_IRQ() but before pseries_hp_wq is initialised. eg: UDP-Lite hash table entries: 2048 (order: 0, 65536 bytes) NET: Registered protocol family 1 Unpacking initramfs... (qemu) object_add memory-backend-ram,id=mem1,size=10G (qemu) device_add pc-dimm,id=dimm1,memdev=mem1 Unable to handle kernel paging request for data at address 0xf94d03007c421378 Faulting instruction address: 0xc00000000012d744 Oops: Kernel access of bad area, sig: 11 [#1] LE SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc2-ziviani+ #26 task: (ptrval) task.stack: (ptrval) NIP: c00000000012d744 LR: c00000000012d744 CTR: 0000000000000000 REGS: (ptrval) TRAP: 0380 Not tainted (4.15.0-rc2-ziviani+) MSR: 8000000000009033 CR: 28088042 XER: 20040000 CFAR: c00000000012d3c4 SOFTE: 0 ... NIP [c00000000012d744] __queue_work+0xd4/0x5c0 LR [c00000000012d744] __queue_work+0xd4/0x5c0 Call Trace: [c0000000fffefb90] [c00000000012d744] __queue_work+0xd4/0x5c0 (unreliable) [c0000000fffefc70] [c00000000012dce4] queue_work_on+0xb4/0xf0 This commit makes the RAS IRQ registration explicitly dependent on the creation of the pseries_hp_wq. Reported-by: Min Deng Reported-by: Daniel Henrique Barboza Tested-by: Jose Ricardo Ziviani Signed-off-by: Michael Ellerman Reviewed-by: David Gibson Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/platforms/pseries/dlpar.c | 21 ++++++++++++++++++--- arch/powerpc/platforms/pseries/pseries.h | 2 ++ arch/powerpc/platforms/pseries/ras.c | 3 ++- 3 files changed, 22 insertions(+), 4 deletions(-) --- a/arch/powerpc/platforms/pseries/dlpar.c +++ b/arch/powerpc/platforms/pseries/dlpar.c @@ -586,11 +586,26 @@ static ssize_t dlpar_show(struct class * static CLASS_ATTR_RW(dlpar); -static int __init pseries_dlpar_init(void) +int __init dlpar_workqueue_init(void) { + if (pseries_hp_wq) + return 0; + pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue", - WQ_UNBOUND, 1); + WQ_UNBOUND, 1); + + return pseries_hp_wq ? 0 : -ENOMEM; +} + +static int __init dlpar_sysfs_init(void) +{ + int rc; + + rc = dlpar_workqueue_init(); + if (rc) + return rc; + return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr); } -machine_device_initcall(pseries, pseries_dlpar_init); +machine_device_initcall(pseries, dlpar_sysfs_init); --- a/arch/powerpc/platforms/pseries/pseries.h +++ b/arch/powerpc/platforms/pseries/pseries.h @@ -98,4 +98,6 @@ static inline unsigned long cmo_get_page return CMO_PageSize; } +int dlpar_workqueue_init(void); + #endif /* _PSERIES_PSERIES_H */ --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -69,7 +69,8 @@ static int __init init_ras_IRQ(void) /* Hotplug Events */ np = of_find_node_by_path("/event-sources/hot-plug-events"); if (np != NULL) { - request_event_sources_irqs(np, ras_hotplug_interrupt, + if (dlpar_workqueue_init() == 0) + request_event_sources_irqs(np, ras_hotplug_interrupt, "RAS_HOTPLUG"); of_node_put(np); } Patches currently in stable-queue which might be from mpe@ellerman.id.au are queue-4.14/powerpc-pseries-make-ras-irq-explicitly-dependent-on-dlpar-wq.patch