diff options
Diffstat (limited to 'drivers/s390/cio/qdio_thinint.c')
| -rw-r--r-- | drivers/s390/cio/qdio_thinint.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c index c61164f4528e..0787b587e4b8 100644 --- a/drivers/s390/cio/qdio_thinint.c +++ b/drivers/s390/cio/qdio_thinint.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright IBM Corp. 2000, 2009 * Author(s): Utz Bacher <utz.bacher@de.ibm.com> @@ -56,10 +57,8 @@ static u32 *get_indicator(void) int i; for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++) - if (!atomic_read(&q_indicators[i].count)) { - atomic_set(&q_indicators[i].count, 1); + if (!atomic_cmpxchg(&q_indicators[i].count, 0, 1)) return &q_indicators[i].ind; - } /* use the shared indicator */ atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count); @@ -68,13 +67,11 @@ static u32 *get_indicator(void) static void put_indicator(u32 *addr) { - int i; + struct indicator_t *ind = container_of(addr, struct indicator_t, ind); if (!addr) return; - i = ((unsigned long)addr - (unsigned long)q_indicators) / - sizeof(struct indicator_t); - atomic_dec(&q_indicators[i].count); + atomic_dec(&ind->count); } void tiqdio_add_input_queues(struct qdio_irq *irq_ptr) |