/* * Copyright 2015, Cyril Bur, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include "basic_asm.h" #include "vsx_asm.h" #long check_vsx(vector int *r3); #This function wraps storeing VSX regs to the end of an array and a #call to a comparison function in C which boils down to a memcmp() FUNC_START(check_vsx) PUSH_BASIC_STACK(32) std r3,STACK_FRAME_PARAM(0)(sp) addi r3, r3, 16 * 12 #Second half of array bl store_vsx ld r3,STACK_FRAME_PARAM(0)(sp) bl vsx_memcmp POP_BASIC_STACK(32) blr FUNC_END(check_vsx) # int preempt_vmx(vector int *varray, int *threads_starting, # int *running); # On starting will (atomically) decrement threads_starting as a signal # that the VMX have been loaded with varray. Will proceed to check the # validity of the VMX registers while running is not zero. FUNC_START(preempt_vsx) PUSH_BASIC_STACK(512) std r3,STACK_FRAME_PARAM(0)(sp) # vector int *varray std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting std r5,STACK_FRAME_PARAM(2)(sp) # int *running bl load_vsx nop sync # Atomic DEC ld r3,STACK_FRAME_PARAM(1)(sp) 1: lwarx r4,0,r3 addi r4,r4,-1 stwcx. r4,0,r3 bne- 1b 2: ld r3,STACK_FRAME_PARAM(0)(sp) bl check_vsx nop cmpdi r3,0 bne 3f ld r4,STACK_FRAME_PARAM(2)(sp) ld r5,0(r4) cmpwi r5,0 bne 2b 3: POP_BASIC_STACK(512) blr FUNC_END(preempt_vsx) class='tabs'> summaryrefslogtreecommitdiff
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /sound/soc/codecs/max98925.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'sound/soc/codecs/max98925.c')