/* * livepatch-sample.c - Kernel Live Patching Sample Module * * Copyright (C) 2014 Seth Jennings * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . */ #include #include #include /* * This (dumb) live patch overrides the function that prints the * kernel boot cmdline when /proc/cmdline is read. * * Example: * * $ cat /proc/cmdline * * * $ insmod livepatch-sample.ko * $ cat /proc/cmdline * this has been live patched * * $ echo 0 > /sys/kernel/livepatch/livepatch_sample/enabled * $ cat /proc/cmdline * */ #include static int livepatch_cmdline_proc_show(struct seq_file *m, void *v) { seq_printf(m, "%s\n", "this has been live patched"); return 0; } static struct klp_func funcs[] = { { .old_name = "cmdline_proc_show", .new_func = livepatch_cmdline_proc_show, }, { } }; static struct klp_object objs[] = { { /* name being NULL means vmlinux */ .funcs = funcs, }, { } }; static struct klp_patch patch = { .mod = THIS_MODULE, .objs = objs, }; static int livepatch_init(void) { int ret; ret = klp_register_patch(&patch); if (ret) return ret; ret = klp_enable_patch(&patch); if (ret) { WARN_ON(klp_unregister_patch(&patch)); return ret; } return 0; } static void livepatch_exit(void) { WARN_ON(klp_disable_patch(&patch)); WARN_ON(klp_unregister_patch(&patch)); } module_init(livepatch_init); module_exit(livepatch_exit); MODULE_LICENSE("GPL"); MODULE_INFO(livepatch, "Y"); c?h=nds-private-remove&id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>diff
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authorJohan Hovold <johan@kernel.org>2017-01-30 11:26:38 +0100
committerJiri Kosina <jkosina@suse.cz>2017-01-31 12:59:32 +0100
commit7a7b5df84b6b4e5d599c7289526eed96541a0654 (patch)
treecf7514c7ddf4410fe37ca9099a2785e1cf08fa7d /net/mac802154/rx.c
parent877a021e08ccb6434718c0cc781fdf943c884cc0 (diff)
HID: cp2112: fix sleep-while-atomic
A recent commit fixing DMA-buffers on stack added a shared transfer buffer protected by a spinlock. This is broken as the USB HID request callbacks can sleep. Fix this up by replacing the spinlock with a mutex. Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable") Cc: stable <stable@vger.kernel.org> # 4.9 Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/mac802154/rx.c')