diff options
Diffstat (limited to 'drivers/staging/vc04_services/interface/vchiq_arm/vchiq_killable.h')
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_killable.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_killable.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_killable.h new file mode 100644 index 000000000000..335446e05476 --- /dev/null +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_killable.h @@ -0,0 +1,69 @@ +/** + * Copyright (c) 2010-2012 Broadcom. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The names of the above-listed copyright holders may not be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * ALTERNATIVELY, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2, as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef VCHIQ_KILLABLE_H +#define VCHIQ_KILLABLE_H + +#include <linux/mutex.h> +#include <linux/semaphore.h> + +#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT)) + +static inline int __must_check down_interruptible_killable(struct semaphore *sem) +{ + /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */ + int ret; + sigset_t blocked, oldset; + siginitsetinv(&blocked, SHUTDOWN_SIGS); + sigprocmask(SIG_SETMASK, &blocked, &oldset); + ret = down_interruptible(sem); + sigprocmask(SIG_SETMASK, &oldset, NULL); + return ret; +} +#define down_interruptible down_interruptible_killable + + +static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock) +{ + /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */ + int ret; + sigset_t blocked, oldset; + siginitsetinv(&blocked, SHUTDOWN_SIGS); + sigprocmask(SIG_SETMASK, &blocked, &oldset); + ret = mutex_lock_interruptible(lock); + sigprocmask(SIG_SETMASK, &oldset, NULL); + return ret; +} +#define mutex_lock_interruptible mutex_lock_interruptible_killable + +#endif |