WSL2-Linux-Kernel/net/xfrm
Sabrina Dubroca 747b67088f xfrm: ipcomp: remove unnecessary get_cpu()
While testing ipcomp on a realtime kernel, Xiumei reported a "sleeping
in atomic" bug, caused by a memory allocation while preemption is
disabled (ipcomp_decompress -> alloc_page -> ... get_page_from_freelist).

As Sebastian noted [1], this get_cpu() isn't actually needed, since
ipcomp_decompress() is called in napi context anyway, so BH is already
disabled.

This patch replaces get_cpu + per_cpu_ptr with this_cpu_ptr, then
simplifies the error returns, since there isn't any common operation
left.

[1] https://lore.kernel.org/lkml/20190820082810.ixkmi56fp7u7eyn2@linutronix.de/

Cc: Juri Lelli <jlelli@redhat.com>
Reported-by: Xiumei Mu <xmu@redhat.com>
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2021-04-19 12:49:29 +02:00
..
Kconfig xfrm/compat: Add 32=>64-bit messages translator 2020-09-24 08:53:03 +02:00
Makefile xfrm: Provide API to register translator module 2020-09-24 08:53:03 +02:00
espintcp.c espintcp: restore IP CB before handing the packet to xfrm 2020-08-17 15:58:04 +02:00
xfrm_algo.c crypto: skcipher - remove the "blkcipher" algorithm type 2019-11-01 13:38:32 +08:00
xfrm_compat.c xfrm/compat: Cleanup WARN()s that can be user-triggered 2021-03-30 07:29:09 +02:00
xfrm_device.c xfrm: Provide private skb extensions for segmented and hw offloaded ESP packets 2021-03-29 09:14:12 +02:00
xfrm_hash.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
xfrm_hash.h xfrm: use complete IPv6 addresses for hash 2018-10-15 10:09:18 +02:00
xfrm_inout.h xfrm: move xfrm4_extract_header to common helper 2020-05-06 09:40:08 +02:00
xfrm_input.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2021-01-21 11:05:10 -08:00
xfrm_interface.c xfrm: interface: fix ipv4 pmtu check to honor ip header df 2021-02-23 18:23:58 +01:00
xfrm_ipcomp.c xfrm: ipcomp: remove unnecessary get_cpu() 2021-04-19 12:49:29 +02:00
xfrm_output.c xfrm: BEET mode doesn't support fragments for inner packets 2021-03-24 09:58:19 +01:00
xfrm_policy.c xfrm: remove stray synchronize_rcu from xfrm_init 2021-04-19 12:25:11 +02:00
xfrm_proc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm_replay.c xfrm: introduce oseq-may-wrap flag 2020-06-24 07:51:01 +02:00
xfrm_state.c net: xfrm: Use sequence counter with associated spinlock 2021-03-22 07:38:08 +01:00
xfrm_sysctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_user.c xfrm: avoid synchronize_rcu during netns destruction 2021-04-19 12:25:11 +02:00