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a42af2d0ad
Fix Coverity issue CID 10138164 Create new macro to avoid non-reachable code. Bug 3461002 Signed-off-by: Mahesh Kumar <mahkumar@nvidia.com> Change-Id: Ie5ff50678e30ae0ddd712ceda212f4b572ce624e Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2765168 Reviewed-by: svcacv <svcacv@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Arun Swain <arswain@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
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* Copyright (c) 2019-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef DCE_COND_H
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#define DCE_COND_H
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#include <linux/wait.h>
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#include <linux/sched.h>
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struct dce_cond {
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bool initialized;
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wait_queue_head_t wq;
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};
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/**
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* DCE_COND_WAIT - Wait for a condition to be true
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*
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* @c - The condition variable to sleep on
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* @condition - The condition that needs to be true
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*
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* Wait for a condition to become true.
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*/
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#define DCE_COND_WAIT(c, condition) \
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({\
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int ret = 0; \
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wait_event((c)->wq, condition); \
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ret;\
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})
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/**
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* DCE_COND_WAIT_INTERRUPTIBLE - Wait for a condition to be true
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*
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* @c - The condition variable to sleep on
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* @condition - The condition that needs to be true
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*
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* Wait for a condition to become true. Returns -ERESTARTSYS
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* on signal.
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*/
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#define DCE_COND_WAIT_INTERRUPTIBLE(c, condition) \
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({ \
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int ret = 0; \
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ret = wait_event_interruptible((c)->wq, condition); \
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ret; \
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})
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/**
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* DCE_COND_WAIT_TIMEOUT - Wait for a condition to be true
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*
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* @c - The condition variable to sleep on
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* @condition - The condition that needs to be true
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* @timeout_ms - Timeout in milliseconds, or 0 for infinite wait.
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* This parameter must be a u32. Since this is a macro, this is
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* enforced by assigning a typecast NULL pointer to a u32 tmp
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* variable which will generate a compiler warning (or error if
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* the warning is configured as an error).
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*
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* Wait for a condition to become true. Returns -ETIMEOUT if
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* the wait timed out with condition false.
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*/
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#define DCE_COND_WAIT_TIMEOUT(c, condition, timeout_ms) \
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({\
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int ret = 0; \
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/* This is the assignment to enforce a u32 for timeout_ms */ \
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u32 *tmp = (typeof(timeout_ms) *)NULL; \
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(void)tmp; \
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if (timeout_ms > 0U) { \
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long _ret = wait_event_timeout((c)->wq, condition, \
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msecs_to_jiffies(timeout_ms)); \
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if (_ret == 0) \
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ret = -ETIMEDOUT; \
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} else { \
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wait_event((c)->wq, condition); \
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} \
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ret;\
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})
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/**
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* DCE_COND_WAIT_INTERRUPTIBLE_TIMEOUT - Wait for a condition to be true
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*
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* @c - The condition variable to sleep on
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* @condition - The condition that needs to be true
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* @timeout_ms - Timeout in milliseconds, or 0 for infinite wait.
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* This parameter must be a u32. Since this is a macro, this is
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* enforced by assigning a typecast NULL pointer to a u32 tmp
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* variable which will generate a compiler warning (or error if
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* the warning is configured as an error).
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*
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* Wait for a condition to become true. Returns -ETIMEOUT if
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* the wait timed out with condition false or -ERESTARTSYS on
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* signal.
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*/
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#define DCE_COND_WAIT_INTERRUPTIBLE_TIMEOUT(c, condition, timeout_ms) \
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({ \
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int ret = 0; \
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/* This is the assignment to enforce a u32 for timeout_ms */ \
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u32 *tmp = (typeof(timeout_ms) *)NULL; \
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(void)tmp; \
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if (timeout_ms > 0U) { \
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long _ret = wait_event_interruptible_timeout((c)->wq, \
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condition, msecs_to_jiffies(timeout_ms)); \
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if (_ret == 0) \
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ret = -ETIMEDOUT; \
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else if (_ret == -ERESTARTSYS) \
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ret = -ERESTARTSYS; \
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} else { \
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ret = wait_event_interruptible((c)->wq, condition); \
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} \
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ret; \
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})
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int dce_cond_init(struct dce_cond *cond);
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void dce_cond_signal(struct dce_cond *cond);
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void dce_cond_signal_interruptible(struct dce_cond *cond);
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int dce_cond_broadcast(struct dce_cond *cond);
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int dce_cond_broadcast_interruptible(struct dce_cond *cond);
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void dce_cond_destroy(struct dce_cond *cond);
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#endif
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