linux-kernel - [PATCH v4 17/40] scsi: qedi: optimize qedi_get_task_idx() by using find_and_set

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Date: Thu, 20 Jun 2024 10:56:40 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Nilesh Javali <njavali@...vell.com>,
	Manish Rangankar <mrangankar@...vell.com>,
	GR-QLogic-Storage-Upstream@...vell.com,
	mpi3mr-linuxdrv.pdl@...adcom.com,
	linux-scsi@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>,
	Alexey Klimov <alexey.klimov@...aro.org>,
	Bart Van Assche <bvanassche@....org>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Shtylyov <s.shtylyov@....ru>
Subject: [PATCH v4 17/40] scsi: qedi: optimize qedi_get_task_idx() by using find_and_set_bit()

qedi_get_task_idx() opencodes find_and_set_bit(). Simplify it and make the
whole function a simiple almost one-liner.

CC: Bart Van Assche <bvanassche@....org>
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 drivers/scsi/qedi/qedi_main.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index cd0180b1f5b9..a6e63a6c25fe 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/find_atomic.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/if_arp.h>
@@ -1824,20 +1825,13 @@ int qedi_get_task_idx(struct qedi_ctx *qedi)
 {
 	s16 tmp_idx;
 
-again:
-	tmp_idx = find_first_zero_bit(qedi->task_idx_map,
-				      MAX_ISCSI_TASK_ENTRIES);
+	tmp_idx = find_and_set_bit(qedi->task_idx_map, MAX_ISCSI_TASK_ENTRIES);
 
 	if (tmp_idx >= MAX_ISCSI_TASK_ENTRIES) {
 		QEDI_ERR(&qedi->dbg_ctx, "FW task context pool is full.\n");
 		tmp_idx = -1;
-		goto err_idx;
 	}
 
-	if (test_and_set_bit(tmp_idx, qedi->task_idx_map))
-		goto again;
-
-err_idx:
 	return tmp_idx;
 }
 
-- 
2.43.0