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Lorenzo Bianconi 621f05288c mt7601u: fix rx buffer refcounting commit `d24c790577` upstream. 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 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-02-03 23:28:42 +01:00
arch	arm64: dts: broadcom: Fix USB DMA address translation for Stingray	2021-02-03 23:28:42 +01:00
block	blk-mq-debugfs: Add decode for BLK_MQ_F_TAG_HCTX_SHARED	2021-01-19 18:27:29 +01:00
certs	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
crypto	crypto: xor - Fix divide error in do_xor_speed()	2021-01-27 11:54:52 +01:00
Documentation	KVM: Forbid the use of tagged userspace addresses for memslots	2021-02-03 23:28:41 +01:00
drivers	mt7601u: fix rx buffer refcounting	2021-02-03 23:28:42 +01:00
fs	io_uring: fix wqe->lock/completion_lock deadlock	2021-02-03 23:28:41 +01:00
include	x86/entry: Emit a symbol for register restoring thunk	2021-02-03 23:28:40 +01:00
init	rcu-tasks: Move RCU-tasks initialization to before early_initcall()	2021-01-19 18:27:28 +01:00
ipc	ipc: adjust proc_ipc_sem_dointvec definition to match prototype	2020-09-05 12:14:29 -07:00
kernel	PM: hibernate: flush swap writer after marking	2021-02-03 23:28:40 +01:00
lib	iov_iter: fix the uaccess area in copy_compat_iovec_from_user	2021-01-27 11:55:09 +01:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm: fix a race on nr_swap_pages	2021-01-30 13:55:19 +01:00
net	wext: fix NULL-ptr-dereference with cfg80211's lack of commit()	2021-02-03 23:28:38 +01:00
samples	samples/bpf: Fix possible hang in xdpsock with multiple threads	2020-12-30 11:53:49 +01:00
scripts	Revert "kconfig: remove 'kvmconfig' and 'xenconfig' shorthands"	2021-01-23 16:03:57 +01:00
security	dump_common_audit_data(): fix racy accesses to ->d_name	2021-01-19 18:27:29 +01:00
sound	ASoC: AMD Renoir - refine DMI entries for some Lenovo products	2021-02-03 23:28:38 +01:00
tools	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions	2021-01-30 13:55:19 +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: Forbid the use of tagged userspace addresses for memslots	2021-02-03 23:28:41 +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	.gitignore: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.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	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-12-10 15:30:13 -08:00
Makefile	Linux 5.10.12	2021-01-30 13:55:20 +01:00
README

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.