37 lines
799 B
C
37 lines
799 B
C
// SPDX-License-Identifier: MIT
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/* Copyright © 2025 Intel Corporation */
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#include <linux/jiffies.h>
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#include "i915_timer_util.h"
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void cancel_timer(struct timer_list *t)
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{
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if (!timer_active(t))
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return;
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timer_delete(t);
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WRITE_ONCE(t->expires, 0);
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}
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void set_timer_ms(struct timer_list *t, unsigned long timeout)
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{
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if (!timeout) {
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cancel_timer(t);
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return;
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}
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timeout = msecs_to_jiffies(timeout);
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/*
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* Paranoia to make sure the compiler computes the timeout before
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* loading 'jiffies' as jiffies is volatile and may be updated in
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* the background by a timer tick. All to reduce the complexity
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* of the addition and reduce the risk of losing a jiffy.
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*/
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barrier();
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/* Keep t->expires = 0 reserved to indicate a canceled timer. */
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mod_timer(t, jiffies + timeout ?: 1);
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}
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