[PATCH v2 31/35] net: smc: use find_and_set_bit() in smc_wr_tx_get_free_slot_index()

Yury Norov
2023-12-03T19:35:15Z

The function opencodes find_and_set_bit() with a for_each() loop. Use
it, and make the whole function a simple almost one-liner.

While here, drop explicit initialization of *idx, because it's already
initialized by the caller in case of ENOLINK, or set properly with
->wr_tx_mask, if nothing is found, in case of EBUSY.

CC: Tony Lu <tonylu@linux.alibaba.com>
CC: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
net/smc/smc_wr.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/net/smc/smc_wr.c b/net/smc/smc_wr.c
index 0021065a600a..b6f0cfc52788 100644
--- a/net/smc/smc_wr.c
+++ b/net/smc/smc_wr.c
@@ -170,15 +170,11 @@ void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context)

static inline int smc_wr_tx_get_free_slot_index(struct smc_link *link, u32 *idx)
{
- *idx = link->wr_tx_cnt;
if (!smc_link_sendable(link))
return -ENOLINK;
- for_each_clear_bit(*idx, link->wr_tx_mask, link->wr_tx_cnt) {
- if (!test_and_set_bit(*idx, link->wr_tx_mask))
- return 0;
- }
- *idx = link->wr_tx_cnt;
- return -EBUSY;
+
+ *idx = find_and_set_bit(link->wr_tx_mask, link->wr_tx_cnt);
+ return *idx < link->wr_tx_cnt ? 0 : -EBUSY;
}

/**
--
2.40.1