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1d868b70e0
Fixes a reported lockdep error in mac80211: [ 179.867321] ============================= [ 179.871510] WARNING: suspicious RCU usage [ 179.875528] 4.14.32 #0 Not tainted [ 179.878924] ----------------------------- [ 179.882981] backports-2017-11-01/net/mac80211/tx.c:594 suspicious rcu_dereference_check() usage! [ 179.891785] [ 179.891785] other info that might help us debug this: [ 179.891785] [ 179.899824] [ 179.899824] rcu_scheduler_active = 2, debug_locks = 1 [ 179.906343] 2 locks held by ksoftirqd/0/7: [ 179.910479] #0: (&(&q->lock)->rlock){+.-.}, at: [<86b207a4>] mt76_dma_tx_cleanup+0x64/0x354 [mt76] [ 179.919734] #1: (&(&fq->lock)->rlock){+.-.}, at: [<87238410>] ieee80211_tx_dequeue+0x54/0xc3c [mac80211] [ 179.929890] [ 179.929890] stack backtrace: [ 179.934257] CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.32 #0 [ 179.940421] Stack : 00000000 00000000 00000000 00000000 80e0fce2 00000036 00000000 00000000 [ 179.948864] 87c3d24c 80696377 8061039c 00000000 00000007 00000001 87c5db78 6534689d [ 179.957306] 00000000 00000000 80e10000 87c5da74 00000001 0000015a 00000007 00000000 [ 179.965748] 00000000 806a0000 000e4171 00000000 00000000 00000000 ffffffff 00000001 [ 179.974189] 806c0000 8692b240 86b000d0 87316fe4 00000001 802c9a68 00000000 80700000 [ 179.982632] ... [ 179.985104] Call Trace: [ 179.987582] [<80010a48>] show_stack+0x58/0x100 [ 179.992040] [<804c2c58>] dump_stack+0xe8/0x170 [ 179.996868] [<87234a04>] ieee80211_tx_h_select_key+0xa8/0x5b8 [mac80211] [ 180.004299] [<87238d44>] ieee80211_tx_dequeue+0x988/0xc3c [mac80211] [ 180.011048] [<86b230dc>] mt76_txq_schedule+0x110/0x3a4 [mt76] [ 180.016821] [<86b209d0>] mt76_dma_tx_cleanup+0x290/0x354 [mt76] [ 180.022777] [<86be2e60>] mt7603_tx_tasklet+0x40/0x6c [mt7603e] [ 180.028637] [<80037058>] tasklet_action+0x110/0x1ec [ 180.033532] [<804e1dac>] __do_softirq+0x164/0x35c [ 180.038235] [<80037174>] run_ksoftirqd+0x40/0x84 [ 180.042870] [<800580c8>] smpboot_thread_fn+0x1a8/0x1d8 [ 180.048023] [<800542e8>] kthread+0x130/0x144 [ 180.052297] [<8000b1f8>] ret_from_kernel_thread+0x14/0x1c Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> |
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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.