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author | David S. Miller <davem@davemloft.net> | 2018-06-26 08:07:17 +0900 |
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committer | David S. Miller <davem@davemloft.net> | 2018-06-26 08:07:17 +0900 |
commit | 9ff3b40e411c00870d1c29cd6b843fca7c4160ae (patch) | |
tree | 4d58943bf8907f5704ba004fd5383c0d7683c61f /lib/refcount.c | |
parent | 823819507095135b475a99048f0b0b6e75580fbc (diff) | |
parent | 6f0d349d922ba44e4348a17a78ea51b7135965b1 (diff) | |
download | linux-9ff3b40e411c00870d1c29cd6b843fca7c4160ae.tar.bz2 |
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'lib/refcount.c')
-rw-r--r-- | lib/refcount.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/refcount.c b/lib/refcount.c index 0eb48353abe3..d3b81cefce91 100644 --- a/lib/refcount.c +++ b/lib/refcount.c @@ -350,3 +350,31 @@ bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock) } EXPORT_SYMBOL(refcount_dec_and_lock); +/** + * refcount_dec_and_lock_irqsave - return holding spinlock with disabled + * interrupts if able to decrement refcount to 0 + * @r: the refcount + * @lock: the spinlock to be locked + * @flags: saved IRQ-flags if the is acquired + * + * Same as refcount_dec_and_lock() above except that the spinlock is acquired + * with disabled interupts. + * + * Return: true and hold spinlock if able to decrement refcount to 0, false + * otherwise + */ +bool refcount_dec_and_lock_irqsave(refcount_t *r, spinlock_t *lock, + unsigned long *flags) +{ + if (refcount_dec_not_one(r)) + return false; + + spin_lock_irqsave(lock, *flags); + if (!refcount_dec_and_test(r)) { + spin_unlock_irqrestore(lock, *flags); + return false; + } + + return true; +} +EXPORT_SYMBOL(refcount_dec_and_lock_irqsave); |