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Gal Pressman 2dc5654e6f net/mlx5e: Fix possible deadlock of VXLAN lock [ Upstream commit `6323514116` ] mlx5e_vxlan_lookup_port is called both from mlx5e_add_vxlan_port (user context) and mlx5e_features_check (softirq), but the lock acquired does not disable bottom half and might result in deadlock. Fix it by simply replacing spin_lock() with spin_lock_bh(). While at it, replace all unnecessary spin_lock_irq() to spin_lock_bh(). lockdep's WARNING: inconsistent lock state [ 654.028136] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 654.028229] swapper/5/0 [HC0[0]:SC1[9]:HE1:SE0] takes: [ 654.028321] (&(&vxlan_db->lock)->rlock){+.?.}, at: [<ffffffffa06e7f0e>] mlx5e_vxlan_lookup_port+0x1e/0x50 [mlx5_core] [ 654.028528] {SOFTIRQ-ON-W} state was registered at: [ 654.028607] _raw_spin_lock+0x3c/0x70 [ 654.028689] mlx5e_vxlan_lookup_port+0x1e/0x50 [mlx5_core] [ 654.028794] mlx5e_vxlan_add_port+0x2e/0x120 [mlx5_core] [ 654.028878] process_one_work+0x1e9/0x640 [ 654.028942] worker_thread+0x4a/0x3f0 [ 654.029002] kthread+0x141/0x180 [ 654.029056] ret_from_fork+0x24/0x30 [ 654.029114] irq event stamp: 579088 [ 654.029174] hardirqs last enabled at (579088): [<ffffffff818f475a>] ip6_finish_output2+0x49a/0x8c0 [ 654.029309] hardirqs last disabled at (579087): [<ffffffff818f470e>] ip6_finish_output2+0x44e/0x8c0 [ 654.029446] softirqs last enabled at (579030): [<ffffffff810b3b3d>] irq_enter+0x6d/0x80 [ 654.029567] softirqs last disabled at (579031): [<ffffffff810b3c05>] irq_exit+0xb5/0xc0 [ 654.029684] other info that might help us debug this: [ 654.029781] Possible unsafe locking scenario: [ 654.029868] CPU0 [ 654.029908] ---- [ 654.029947] lock(&(&vxlan_db->lock)->rlock); [ 654.030045] <Interrupt> [ 654.030090] lock(&(&vxlan_db->lock)->rlock); [ 654.030162] * DEADLOCK * Fixes: `b3f63c3d5e` ("net/mlx5e: Add netdev support for VXLAN tunneling") Signed-off-by: Gal Pressman <galp@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2018-01-02 20:31:10 +01:00
arch	x86/ldt: Make the LDT mapping RO	2018-01-02 20:31:02 +01:00
block	block: don't let passthrough IO go into .make_request_fn()	2018-01-02 20:31:05 +01:00
certs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
crypto	crypto: af_alg - fix race accessing cipher request	2017-12-29 17:53:46 +01:00
Documentation	x86/pti: Put the LDT in its own PGD if PTI is on	2018-01-02 20:31:00 +01:00
drivers	net/mlx5e: Fix possible deadlock of VXLAN lock	2018-01-02 20:31:10 +01:00
firmware	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fs	locking/barriers: Convert users of lockless_dereference() to READ_ONCE()	2017-12-25 14:26:21 +01:00
include	net/mlx5: Fix rate limit packet pacing naming and struct	2018-01-02 20:31:09 +01:00
init	x86/mm/pti: Add infrastructure for page table isolation	2018-01-02 20:30:56 +01:00
ipc	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
kernel	cpufreq: schedutil: Use idle_calls counter of the remote CPU	2018-01-02 20:31:05 +01:00
lib	x86/unwind: Rename unwinder config options to 'CONFIG_UNWINDER_*'	2017-12-25 14:26:13 +01:00
mm	mm/sparsemem: Fix ARM64 boot crash when CONFIG_SPARSEMEM_EXTREME=y	2017-12-25 14:26:31 +01:00
net	tcp: invalidate rate samples during SACK reneging	2018-01-02 20:31:09 +01:00
samples	samples/bpf: adjust rlimit RLIMIT_MEMLOCK for xdp1	2017-12-20 10:10:31 +01:00
scripts	linux/compiler.h: Split into compiler.h and compiler_types.h	2017-12-25 14:26:33 +01:00
security	x86/mm/pti: Add Kconfig	2018-01-02 20:31:02 +01:00
sound	ALSA: hda - Fix missing COEF init for ALC225/295/299	2018-01-02 20:31:05 +01:00
tools	x86/ldt: Make the LDT mapping RO	2018-01-02 20:31:02 +01:00
usr	initramfs: fix initramfs rebuilds w/ compression after disabling	2017-11-03 07:39:19 -07:00
virt	KVM: arm/arm64: Fix HYP unmapping going off limits	2017-12-29 17:53:48 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Add hch to .get_maintainer.ignore	2015-08-21 14:30:10 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	kbuild: Add support to generate LLVM assembly files	2017-04-25 08:13:52 +09:00
.mailmap	.mailmap: Add Maciej W. Rozycki's Imagination e-mail address	2017-11-10 12:16:15 -08:00
COPYING	[PATCH] update FSF address in COPYING	2005-09-10 10:06:29 -07:00
CREDITS	MAINTAINERS: update TPM driver infrastructure changes	2017-11-09 17:58:40 -08:00
Kbuild	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
MAINTAINERS	Merge branch 'akpm' (patches from Andrew)	2017-11-09 18:26:51 -08:00
Makefile	kbuild: add '-fno-stack-check' to kernel build options	2018-01-02 20:31:06 +01:00
README	README: add a new README file, pointing to the Documentation/	2016-10-24 08:12:35 -02:00

README

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.