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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1669724f70
[ Upstream commit 5f0ce5848733b86deaba1c6d102e20479230b20a ]
Fix the following possible deadlock reported by lockdep disabling BH
running mt76_free_pending_txwi()
================================
WARNING: inconsistent lock state
5.9.0-rc6 #14 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
rmmod/1227 [HC0[0]:SC0[0]:HE1:SE1] takes:
ffff888156a83530 (&dev->lock#2){+.?.}-{2:2}, at: mt76_dma_cleanup+0x125/0x150 [mt76]
{IN-SOFTIRQ-W} state was registered at:
__lock_acquire+0x20c/0x6b0
lock_acquire+0x9d/0x220
_raw_spin_lock+0x2c/0x70
mt76_dma_tx_cleanup+0xc7/0x200 [mt76]
mt76x02_poll_tx+0x31/0xb0 [mt76x02_lib]
napi_poll+0x3a/0x100
net_rx_action+0xa8/0x200
__do_softirq+0xc4/0x430
asm_call_on_stack+0xf/0x20
do_softirq_own_stack+0x49/0x60
irq_exit_rcu+0x9a/0xd0
common_interrupt+0xa4/0x190
asm_common_interrupt+0x1e/0x40
irq event stamp: 9915
hardirqs last enabled at (9915): [<ffffffff8124e286>] __free_pages_ok+0x336/0x3b0
hardirqs last disabled at (9914): [<ffffffff8124e24e>] __free_pages_ok+0x2fe/0x3b0
softirqs last enabled at (9912): [<ffffffffa03aa672>] mt76_dma_rx_cleanup+0xa2/0x120 [mt76]
softirqs last disabled at (9846): [<ffffffffa03aa5ea>] mt76_dma_rx_cleanup+0x1a/0x120 [mt76]
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&dev->lock#2);
<Interrupt>
lock(&dev->lock#2);
*** DEADLOCK ***
1 lock held by rmmod/1227:
#0: ffff88815b5eb240 (&dev->mutex){....}-{3:3}, at: driver_detach+0xb5/0x110
stack backtrace:
CPU: 1 PID: 1227 Comm: rmmod Kdump: loaded Not tainted 5.9.0-rc6-wdn-src+ #14
Hardware name: Dell Inc. Studio XPS 1340/0K183D, BIOS A11 09/08/2009
Call Trace:
dump_stack+0x77/0xa0
mark_lock_irq.cold+0x15/0x39
mark_lock+0x1fc/0x500
mark_usage+0xc7/0x140
__lock_acquire+0x20c/0x6b0
? find_held_lock+0x2b/0x80
? sched_clock_cpu+0xc/0xb0
lock_acquire+0x9d/0x220
? mt76_dma_cleanup+0x125/0x150 [mt76]
_raw_spin_lock+0x2c/0x70
? mt76_dma_cleanup+0x125/0x150 [mt76]
mt76_dma_cleanup+0x125/0x150 [mt76]
mt76x2_cleanup+0x5a/0x70 [mt76x2e]
mt76x2e_remove+0x18/0x30 [mt76x2e]
pci_device_remove+0x36/0xa0
__device_release_driver+0x16c/0x220
driver_detach+0xcf/0x110
bus_remove_driver+0x56/0xca
pci_unregister_driver+0x36/0x80
__do_sys_delete_module.constprop.0+0x127/0x200
? syscall_enter_from_user_mode+0x1d/0x50
? trace_hardirqs_on+0x1c/0xe0
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff0da54e36b
Code: 73 01 c3 48 8b 0d 2d 0b 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 0a 0c 00 f7 d8 64 89 01 48
Fixes:
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|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.