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https://github.com/edk2-porting/linux-next.git
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8970bfe706
cm_sbs_sem is being downed (via acpi_ac_init->acpi_lock_ac_dir) before it is initialised, with grave results. - Make it a mutex - Initialise it - Make it static - Clean other stuff up. Thanks to Paul Drynoff <pauldrynoff@gmail.com> for reporting and testing. Cc: Rich Townsend <rhdt@bartol.udel.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/acmacros.h>
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#include <acpi/actypes.h>
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#include <acpi/acutils.h>
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ACPI_MODULE_NAME("cm_sbs")
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#define ACPI_AC_CLASS "ac_adapter"
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#define ACPI_BATTERY_CLASS "battery"
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#define ACPI_SBS_COMPONENT 0x00080000
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#define _COMPONENT ACPI_SBS_COMPONENT
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static struct proc_dir_entry *acpi_ac_dir;
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static struct proc_dir_entry *acpi_battery_dir;
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static DEFINE_MUTEX(cm_sbs_mutex);
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static int lock_ac_dir_cnt;
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static int lock_battery_dir_cnt;
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struct proc_dir_entry *acpi_lock_ac_dir(void)
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{
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mutex_lock(&cm_sbs_mutex);
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if (!acpi_ac_dir)
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acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
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if (acpi_ac_dir) {
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lock_ac_dir_cnt++;
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Cannot create %s\n", ACPI_AC_CLASS));
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}
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mutex_unlock(&cm_sbs_mutex);
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return acpi_ac_dir;
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}
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EXPORT_SYMBOL(acpi_lock_ac_dir);
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void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
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{
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mutex_lock(&cm_sbs_mutex);
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if (acpi_ac_dir_param)
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lock_ac_dir_cnt--;
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if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
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remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
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acpi_ac_dir = 0;
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}
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mutex_unlock(&cm_sbs_mutex);
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}
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EXPORT_SYMBOL(acpi_unlock_ac_dir);
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struct proc_dir_entry *acpi_lock_battery_dir(void)
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{
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mutex_lock(&cm_sbs_mutex);
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if (!acpi_battery_dir) {
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acpi_battery_dir =
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proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
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}
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if (acpi_battery_dir) {
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lock_battery_dir_cnt++;
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Cannot create %s\n", ACPI_BATTERY_CLASS));
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}
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mutex_unlock(&cm_sbs_mutex);
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return acpi_battery_dir;
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}
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EXPORT_SYMBOL(acpi_lock_battery_dir);
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void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
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{
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mutex_lock(&cm_sbs_mutex);
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if (acpi_battery_dir_param)
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lock_battery_dir_cnt--;
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if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
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&& acpi_battery_dir) {
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remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
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acpi_battery_dir = 0;
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}
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mutex_unlock(&cm_sbs_mutex);
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return;
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}
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EXPORT_SYMBOL(acpi_unlock_battery_dir);
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static int __init acpi_cm_sbs_init(void)
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{
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return 0;
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}
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subsys_initcall(acpi_cm_sbs_init);
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