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Lorenzo Bianconi d24c790577 mt7601u: fix rx buffer refcounting Fix the following crash due to erroneous page refcounting: [ 32.445919] BUG: Bad page state in process swapper/1 pfn:11f65a [ 32.447409] page:00000000938f0632 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x11f65a [ 32.449605] flags: 0x8000000000000000() [ 32.450421] raw: 8000000000000000 ffffffff825b0148 ffffea00045ae988 0000000000000000 [ 32.451795] raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000 [ 32.452999] page dumped because: nonzero mapcount [ 32.453888] Modules linked in: [ 32.454492] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-rc2+ #1976 [ 32.455695] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1.fc33 04/01/2014 [ 32.457157] Call Trace: [ 32.457636] <IRQ> [ 32.457993] dump_stack+0x77/0x97 [ 32.458576] bad_page.cold+0x65/0x96 [ 32.459198] get_page_from_freelist+0x46a/0x11f0 [ 32.460008] __alloc_pages_nodemask+0x10a/0x2b0 [ 32.460794] mt7601u_rx_tasklet+0x651/0x720 [ 32.461505] tasklet_action_common.constprop.0+0x6b/0xd0 [ 32.462343] __do_softirq+0x152/0x46c [ 32.462928] asm_call_irq_on_stack+0x12/0x20 [ 32.463610] </IRQ> [ 32.463953] do_softirq_own_stack+0x5b/0x70 [ 32.464582] irq_exit_rcu+0x9f/0xe0 [ 32.465028] common_interrupt+0xae/0x1a0 [ 32.465536] asm_common_interrupt+0x1e/0x40 [ 32.466071] RIP: 0010:default_idle+0x18/0x20 [ 32.468981] RSP: 0018:ffffc90000077f00 EFLAGS: 00000246 [ 32.469648] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 32.470550] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81aac3dd [ 32.471463] RBP: ffff88810022ab00 R08: 0000000000000001 R09: 0000000000000001 [ 32.472335] R10: 0000000000000046 R11: 0000000000005aa0 R12: 0000000000000000 [ 32.473235] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 32.474139] ? default_idle_call+0x4d/0x200 [ 32.474681] default_idle_call+0x74/0x200 [ 32.475192] do_idle+0x1d5/0x250 [ 32.475612] cpu_startup_entry+0x19/0x20 [ 32.476114] secondary_startup_64_no_verify+0xb0/0xbb [ 32.476765] Disabling lock debugging due to kernel taint Fixes: `c869f77d6a` ("add mt7601u driver") Co-developed-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Acked-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/62b2380c8c2091834cfad05e1059b55f945bd114.1610643952.git.lorenzo@kernel.org		2021-01-18 17:21:05 +02:00
arch	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-01-08 12:05:11 -08:00
block	SCSI fixes on 20210101	2021-01-01 12:58:07 -08:00
certs	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
crypto	crypto: ecdh - avoid buffer overflow in ecdh_set_secret()	2021-01-03 08:35:35 +11:00
Documentation	Networking fixes for 5.11-rc3 (part 2), including fixes from bpf and	2021-01-08 12:12:30 -08:00
drivers	mt7601u: fix rx buffer refcounting	2021-01-18 17:21:05 +02:00
fs	poll: fix performance regression due to out-of-line __put_user()	2021-01-08 11:06:29 -08:00
include	Networking fixes for 5.11-rc3 (part 2), including fixes from bpf and	2021-01-08 12:12:30 -08:00
init	Revert "init/console: Use ttynull as a fallback when there is no console"	2021-01-08 11:02:18 -08:00
ipc	Merge branch 'akpm' (patches from Andrew)	2020-12-15 12:53:37 -08:00
kernel	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf	2021-01-07 15:10:27 -08:00
lib	An addition to compiler_attributes.h thanks to:	2021-01-04 10:47:38 -08:00
LICENSES	LICENSES: Add the CC-BY-4.0 license	2020-12-08 10:33:27 -07:00
mm	mm: make wait_on_page_writeback() wait for multiple pending writebacks	2021-01-05 11:33:00 -08:00
net	nexthop: Bounce NHA_GATEWAY in FDB nexthop groups	2021-01-07 18:47:18 -08:00
samples	ARM: SoC drivers for v5.11	2020-12-16 16:38:41 -08:00
scripts	gcc-plugins: fix gcc 11 indigestion with plugins...	2021-01-06 15:08:23 -08:00
security	Provide a fix for the incorrect handling of privilege	2020-12-24 14:08:43 -08:00
sound	sound fixes for 5.11-rc3	2021-01-05 13:25:49 -08:00
tools	selftests: fib_nexthops: Fix wrong mausezahn invocation	2021-01-07 18:47:19 -08:00
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	ARM:	2020-12-20 10:44:05 -08:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.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: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.mailmap	RDMA 5.11 pull request	2020-12-16 13:42:26 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-12-11 22:29:38 -08:00
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	MAINTAINERS: Update MCAN MMIO device driver maintainer	2021-01-07 11:02:10 +01:00
Makefile	Linux 5.11-rc2	2021-01-03 15:55:30 -08:00
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.