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21b172ee11
Fix the warning below by calling rhashtable_lookup_fast.
Also, make some code movements for better quality and human
readability.
[ 342.450870] WARNING: suspicious RCU usage
[ 342.455856] 4.18.0-rc2+ #17 Tainted: G O
[ 342.462210] -----------------------------
[ 342.467202] ./include/linux/rhashtable.h:481 suspicious rcu_dereference_check() usage!
[ 342.476568]
[ 342.476568] other info that might help us debug this:
[ 342.476568]
[ 342.486978]
[ 342.486978] rcu_scheduler_active = 2, debug_locks = 1
[ 342.495211] 4 locks held by modprobe/3934:
[ 342.500265] #0: 00000000e23116b2 (mlx5_intf_mutex){+.+.}, at:
mlx5_unregister_interface+0x18/0x90 [mlx5_core]
[ 342.511953] #1: 00000000ca16db96 (rtnl_mutex){+.+.}, at: unregister_netdev+0xe/0x20
[ 342.521109] #2: 00000000a46e2c4b (&priv->state_lock){+.+.}, at: mlx5e_close+0x29/0x60
[mlx5_core]
[ 342.531642] #3: 0000000060c5bde3 (mem_id_lock){+.+.}, at: xdp_rxq_info_unreg+0x93/0x6b0
[ 342.541206]
[ 342.541206] stack backtrace:
[ 342.547075] CPU: 12 PID: 3934 Comm: modprobe Tainted: G O 4.18.0-rc2+ #17
[ 342.556621] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 1.5.4 10/002/2015
[ 342.565606] Call Trace:
[ 342.568861] dump_stack+0x78/0xb3
[ 342.573086] xdp_rxq_info_unreg+0x3f5/0x6b0
[ 342.578285] ? __call_rcu+0x220/0x300
[ 342.582911] mlx5e_free_rq+0x38/0xc0 [mlx5_core]
[ 342.588602] mlx5e_close_channel+0x20/0x120 [mlx5_core]
[ 342.594976] mlx5e_close_channels+0x26/0x40 [mlx5_core]
[ 342.601345] mlx5e_close_locked+0x44/0x50 [mlx5_core]
[ 342.607519] mlx5e_close+0x42/0x60 [mlx5_core]
[ 342.613005] __dev_close_many+0xb1/0x120
[ 342.617911] dev_close_many+0xa2/0x170
[ 342.622622] rollback_registered_many+0x148/0x460
[ 342.628401] ? __lock_acquire+0x48d/0x11b0
[ 342.633498] ? unregister_netdev+0xe/0x20
[ 342.638495] rollback_registered+0x56/0x90
[ 342.643588] unregister_netdevice_queue+0x7e/0x100
[ 342.649461] unregister_netdev+0x18/0x20
[ 342.654362] mlx5e_remove+0x2a/0x50 [mlx5_core]
[ 342.659944] mlx5_remove_device+0xe5/0x110 [mlx5_core]
[ 342.666208] mlx5_unregister_interface+0x39/0x90 [mlx5_core]
[ 342.673038] cleanup+0x5/0xbfc [mlx5_core]
[ 342.678094] __x64_sys_delete_module+0x16b/0x240
[ 342.683725] ? do_syscall_64+0x1c/0x210
[ 342.688476] do_syscall_64+0x5a/0x210
[ 342.693025] entry_SYSCALL_64_after_hwframe+0x49/0xbe
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| 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.
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.