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James Smart 21c0d46934 scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock 
[ Upstream commit 03cbbd7c2f ]

During stress I/O tests with 500+ vports, hard LOCKUP call traces are
observed.

CPU A:
 native_queued_spin_lock_slowpath+0x192
 _raw_spin_lock_irqsave+0x32
 lpfc_handle_fcp_err+0x4c6
 lpfc_fcp_io_cmd_wqe_cmpl+0x964
 lpfc_sli4_fp_handle_cqe+0x266
 __lpfc_sli4_process_cq+0x105
 __lpfc_sli4_hba_process_cq+0x3c
 lpfc_cq_poll_hdler+0x16
 irq_poll_softirq+0x76
 __softirqentry_text_start+0xe4
 irq_exit+0xf7
 do_IRQ+0x7f

CPU B:
 native_queued_spin_lock_slowpath+0x5b
 _raw_spin_lock+0x1c
 lpfc_abort_handler+0x13e
 scmd_eh_abort_handler+0x85
 process_one_work+0x1a7
 worker_thread+0x30
 kthread+0x112
 ret_from_fork+0x1f

Diagram of lockup:

CPUA                            CPUB
----                            ----
lpfc_cmd->buf_lock
                            phba->hbalock
                            lpfc_cmd->buf_lock
phba->hbalock

Fix by reordering the taking of the lpfc_cmd->buf_lock and phba->hbalock in
lpfc_abort_handler routine so that it tries to take the lpfc_cmd->buf_lock
first before phba->hbalock.

Link: https://lore.kernel.org/r/20220412222008.126521-7-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-09 10:25:20 +02:00
arch ACPICA: Avoid cache flush inside virtual machines 2022-06-09 10:25:19 +02:00
block block/mq-deadline: Set the fifo_time member also if inserting at head 2022-05-25 09:59:06 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: ecrdsa - Fix incorrect use of vli_cmp 2022-06-06 08:47:53 +02:00
Documentation docs: submitting-patches: Fix crossref to 'The canonical patch format' 2022-06-06 08:47:56 +02:00
drivers scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock 2022-06-09 10:25:20 +02:00
fs btrfs: zoned: fix comparison of alloc_offset vs meta_write_pointer 2022-06-09 10:25:17 +02:00
include ALSA: jack: Access input_dev under mutex 2022-06-09 10:25:20 +02:00
init kthread: Don't allocate kthread_struct for init and umh 2022-06-09 10:25:16 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel rcu: Make TASKS_RUDE_RCU select IRQ_WORK 2022-06-09 10:25:19 +02:00
lib assoc_array: Fix BUG_ON during garbage collect 2022-06-06 08:47:51 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm zsmalloc: fix races between asynchronous zspage free and page migration 2022-06-06 08:47:53 +02:00
net tcp: consume incoming skb leading to a reset 2022-06-09 10:25:20 +02:00
samples samples/bpf, xdpsock: Fix race when running for fix duration of time 2022-04-08 13:58:18 +02:00
scripts kconfig: add fflush() before ferror() check 2022-05-25 09:58:59 +02:00
security lockdown: also lock down previous kgdb use 2022-05-25 09:59:10 +02:00
sound ALSA: jack: Access input_dev under mutex 2022-06-09 10:25:20 +02:00
tools tools/power turbostat: fix ICX DRAM power numbers 2022-06-09 10:25:20 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-25 09:59:03 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +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 net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.13 2022-06-06 08:47:57 +02:00
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.