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Jiri Kosina 806addaf8d iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_enqueue_hcmd() 
[ Upstream commit 2800aadc18 ]

It's possible for iwl_pcie_enqueue_hcmd() to be called with hard IRQs
disabled (e.g. from LED core). We can't enable BHs in such a situation.

Turn the unconditional BH-enable/BH-disable code into
hardirq-disable/conditional-enable.

This fixes the warning below.

 WARNING: CPU: 1 PID: 1139 at kernel/softirq.c:178 __local_bh_enable_ip+0xa5/0xf0
 CPU: 1 PID: 1139 Comm: NetworkManager Not tainted 5.12.0-rc1-00004-gb4ded168af79 #7
 Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017
 RIP: 0010:__local_bh_enable_ip+0xa5/0xf0
 Code: f7 69 e8 ee 23 14 00 fb 66 0f 1f 44 00 00 65 8b 05 f0 f4 f7 69 85 c0 74 3f 48 83 c4 08 5b c3 65 8b 05 9b fe f7 69 85 c0 75 8e <0f> 0b eb 8a 48 89 3c 24 e8 4e 20 14 00 48 8b 3c 24 eb 91 e8 13 4e
 RSP: 0018:ffffafd580b13298 EFLAGS: 00010046
 RAX: 0000000000000000 RBX: 0000000000000201 RCX: 0000000000000000
 RDX: 0000000000000003 RSI: 0000000000000201 RDI: ffffffffc1272389
 RBP: ffff96517ae4c018 R08: 0000000000000001 R09: 0000000000000000
 R10: ffffafd580b13178 R11: 0000000000000001 R12: ffff96517b060000
 R13: 0000000000000000 R14: ffffffff80000000 R15: 0000000000000001
 FS:  00007fc604ebefc0(0000) GS:ffff965267480000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000055fb3fef13b2 CR3: 0000000109112004 CR4: 00000000003706e0
 Call Trace:
  ? _raw_spin_unlock_bh+0x1f/0x30
  iwl_pcie_enqueue_hcmd+0x5d9/0xa00 [iwlwifi]
  iwl_trans_txq_send_hcmd+0x6c/0x430 [iwlwifi]
  iwl_trans_send_cmd+0x88/0x170 [iwlwifi]
  ? lock_acquire+0x277/0x3d0
  iwl_mvm_send_cmd+0x32/0x80 [iwlmvm]
  iwl_mvm_led_set+0xc2/0xe0 [iwlmvm]
  ? led_trigger_event+0x46/0x70
  led_trigger_event+0x46/0x70
  ieee80211_do_open+0x5c5/0xa20 [mac80211]
  ieee80211_open+0x67/0x90 [mac80211]
  __dev_open+0xd4/0x150
  __dev_change_flags+0x19e/0x1f0
  dev_change_flags+0x23/0x60
  do_setlink+0x30d/0x1230
  ? lock_is_held_type+0xb4/0x120
  ? __nla_validate_parse.part.7+0x57/0xcb0
  ? __lock_acquire+0x2e1/0x1a50
  __rtnl_newlink+0x560/0x910
  ? __lock_acquire+0x2e1/0x1a50
  ? __lock_acquire+0x2e1/0x1a50
  ? lock_acquire+0x277/0x3d0
  ? sock_def_readable+0x5/0x290
  ? lock_is_held_type+0xb4/0x120
  ? find_held_lock+0x2d/0x90
  ? sock_def_readable+0xb3/0x290
  ? lock_release+0x166/0x2a0
  ? lock_is_held_type+0x90/0x120
  rtnl_newlink+0x47/0x70
  rtnetlink_rcv_msg+0x25c/0x470
  ? netlink_deliver_tap+0x97/0x3e0
  ? validate_linkmsg+0x350/0x350
  netlink_rcv_skb+0x50/0x100
  netlink_unicast+0x1b2/0x280
  netlink_sendmsg+0x336/0x450
  sock_sendmsg+0x5b/0x60
  ____sys_sendmsg+0x1ed/0x250
  ? copy_msghdr_from_user+0x5c/0x90
  ___sys_sendmsg+0x88/0xd0
  ? lock_is_held_type+0xb4/0x120
  ? find_held_lock+0x2d/0x90
  ? lock_release+0x166/0x2a0
  ? __fget_files+0xfe/0x1d0
  ? __sys_sendmsg+0x5e/0xa0
  __sys_sendmsg+0x5e/0xa0
  ? lockdep_hardirqs_on_prepare+0xd9/0x170
  do_syscall_64+0x33/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xae
 RIP: 0033:0x7fc605c9572d
 Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 da ee ff ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 2e ef ff ff 48
 RSP: 002b:00007fffc83789f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
 RAX: ffffffffffffffda RBX: 000055ef468570c0 RCX: 00007fc605c9572d
 RDX: 0000000000000000 RSI: 00007fffc8378a30 RDI: 000000000000000c
 RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
 R13: 00007fffc8378b80 R14: 00007fffc8378b7c R15: 0000000000000000
 irq event stamp: 170785
 hardirqs last  enabled at (170783): [<ffffffff9609a8c2>] __local_bh_enable_ip+0x82/0xf0
 hardirqs last disabled at (170784): [<ffffffff96a8613d>] _raw_read_lock_irqsave+0x8d/0x90
 softirqs last  enabled at (170782): [<ffffffffc1272389>] iwl_pcie_enqueue_hcmd+0x5d9/0xa00 [iwlwifi]
 softirqs last disabled at (170785): [<ffffffffc1271ec6>] iwl_pcie_enqueue_hcmd+0x116/0xa00 [iwlwifi]

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM/Clang v12.0.0-rc3
Acked-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/nycvar.YFH.7.76.2103021125430.12405@cbobk.fhfr.pm
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-04-21 13:00:51 +02:00
arch arc: kernel: Return -EFAULT if copy_to_user() fails 2021-04-21 13:00:51 +02:00
block block: only update parent bi_status when bio fail 2021-04-16 11:43:21 +02:00
certs certs: Fix blacklist flag type confusion 2021-03-04 11:37:59 +01:00
crypto crypto: mips/poly1305 - enable for all MIPS processors 2021-03-17 17:06:10 +01:00
Documentation dt-bindings: net: ethernet-controller: fix typo in NVMEM 2021-04-14 08:42:12 +02:00
drivers iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_enqueue_hcmd() 2021-04-21 13:00:51 +02:00
fs block: don't ignore REQ_NOWAIT for direct IO 2021-04-16 11:43:21 +02:00
include dmaengine: idxd: fix delta_rec and crc size field for completion record 2021-04-21 13:00:50 +02:00
init init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM 2021-04-10 13:36:11 +02:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel lockdep: Add a missing initialization hint to the "INFO: Trying to register non-static key" message 2021-04-21 13:00:51 +02:00
lib XArray: Fix splitting to non-zero orders 2021-04-16 11:43:21 +02:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm percpu: make pcpu_nr_empty_pop_pages per chunk type 2021-04-14 08:42:03 +02:00
net net/sctp: fix race condition in sctp_destroy_sock 2021-04-21 13:00:50 +02:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:06:12 +01:00
scripts kbuild: dummy-tools: fix inverted tests for gcc 2021-03-30 14:31:50 +02:00
security selinux: fix race between old and new sidtab 2021-04-14 08:41:57 +02:00
sound ASoC: sunxi: sun4i-codec: fill ASoC card owner 2021-04-14 08:42:08 +02:00
tools perf map: Tighten snprintf() string precision to pass gcc check on some 32-bit arches 2021-04-16 11:43:22 +02:00
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: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-02-26 10:13:01 +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 MAINTAINERS: move the staging subsystem to lists.linux.dev 2021-03-25 09:04:18 +01:00
Makefile Linux 5.10.31 2021-04-16 11:43:22 +02:00
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.