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Mike Marciniszyn d87c10607b IB/hfi1: Fix early init panic 
commit f6a3cfec3c upstream.

The following trace can be observed with an init failure such as firmware
load failures:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
  PGD 0 P4D 0
  Oops: 0010 [#1] SMP PTI
  CPU: 0 PID: 537 Comm: kworker/0:3 Tainted: G           OE    --------- -  - 4.18.0-240.el8.x86_64 #1
  Workqueue: events work_for_cpu_fn
  RIP: 0010:0x0
  Code: Bad RIP value.
  RSP: 0000:ffffae5f878a3c98 EFLAGS: 00010046
  RAX: 0000000000000000 RBX: ffff95e48e025c00 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff95e48e025c00
  RBP: ffff95e4bf3660a4 R08: 0000000000000000 R09: ffffffff86d5e100
  R10: ffff95e49e1de600 R11: 0000000000000001 R12: ffff95e4bf366180
  R13: ffff95e48e025c00 R14: ffff95e4bf366028 R15: ffff95e4bf366000
  FS:  0000000000000000(0000) GS:ffff95e4df200000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffffffffffffffd6 CR3: 0000000f86a0a003 CR4: 00000000001606f0
  Call Trace:
   receive_context_interrupt+0x1f/0x40 [hfi1]
   __free_irq+0x201/0x300
   free_irq+0x2e/0x60
   pci_free_irq+0x18/0x30
   msix_free_irq.part.2+0x46/0x80 [hfi1]
   msix_clean_up_interrupts+0x2b/0x70 [hfi1]
   hfi1_init_dd+0x640/0x1a90 [hfi1]
   do_init_one.isra.19+0x34d/0x680 [hfi1]
   local_pci_probe+0x41/0x90
   work_for_cpu_fn+0x16/0x20
   process_one_work+0x1a7/0x360
   worker_thread+0x1cf/0x390
   ? create_worker+0x1a0/0x1a0
   kthread+0x112/0x130
   ? kthread_flush_work_fn+0x10/0x10
   ret_from_fork+0x35/0x40

The free_irq() results in a callback to the registered interrupt handler,
and rcd->do_interrupt is NULL because the receive context data structures
are not fully initialized.

Fix by ensuring that the do_interrupt is always assigned and adding a
guards in the slow path handler to detect and handle a partially
initialized receive context and noop the receive.

Link: https://lore.kernel.org/r/20211129192003.101968.33612.stgit@awfm-01.cornelisnetworks.com
Cc: stable@vger.kernel.org
Fixes: b0ba3c18d6 ("IB/hfi1: Move normal functions from hfi1_devdata to const array")
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-14 11:32:34 +01:00
arch parisc: Mark cr16 CPU clocksource unstable on all SMP machines 2021-12-08 09:03:29 +01:00
block block: Check ADMIN before NICE for IOPRIO_CLASS_RT 2021-11-26 10:39:19 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:50:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-18 14:04:12 +01:00
Documentation netfilter: ipvs: Fix reuse connection if RS weight is 0 2021-12-01 09:19:02 +01:00
drivers IB/hfi1: Fix early init panic 2021-12-14 11:32:34 +01:00
fs fget: check that the fd still exists after getting a ref to it 2021-12-08 09:03:21 +01:00
include HID: add hid_is_usb() function to make it simpler for USB detection 2021-12-14 11:32:33 +01:00
init bootconfig: init: Fix memblock leak in xbc_make_cmdline() 2021-11-21 13:46:35 +01:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:19:10 +01:00
kernel sched/uclamp: Fix rq->uclamp_max not set on first enqueue 2021-12-08 09:03:27 +01:00
lib siphash: use _unaligned version by default 2021-12-08 09:03:23 +01:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm hugetlbfs: flush TLBs correctly after huge_pmd_unshare 2021-11-26 10:39:21 +01:00
net nft_set_pipapo: Fix bucket load in AVX2 lookup routine for six 8-bit groups 2021-12-14 11:32:34 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-18 14:04:11 +01:00
scripts gcc-plugins: fix gcc 11 indigestion with plugins... 2021-12-14 11:32:33 +01:00
security selinux: fix NULL-pointer dereference when hashtab allocation fails 2021-11-26 10:39:21 +01:00
sound ALSA: intel-dsp-config: add quirk for CML devices based on ES8336 codec 2021-12-08 09:03:25 +01:00
tools selftests: net: Correct case name 2021-12-08 09:03:24 +01:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt KVM: Disallow user memslot with size that exceeds "unsigned long" 2021-12-08 09:03:21 +01:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS f2fs: move ioctl interface definitions to separated file 2021-05-19 10:13:00 +02:00
Makefile Linux 5.10.84 2021-12-08 09:03:30 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.