From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: jikos@kernel.org, benjamin.tissoires@redhat.com
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] HID: logitech-hidpp: Use 'atomic_inc_return' instead of hand-writing it
Date: Fri, 23 Jul 2021 17:41:52 +0200 [thread overview]
Message-ID: <1091bc38881086be28d561adca042caba234f3f2.1627054657.git.christophe.jaillet@wanadoo.fr> (raw)
This function logs a warning if the workqueue gets too big.
In order to save a few cycles, use 'atomic_inc_return()' instead of an
'atomic_inc()/atomic_read()' sequence.
This axes a line of code and saves a 'atomic_read()' call.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
drivers/hid/hid-logitech-hidpp.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 61635e629469..a7fa35245c2e 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -2240,11 +2240,10 @@ static int hidpp_ff_queue_work(struct hidpp_ff_private_data *data, int effect_id
wd->size = size;
memcpy(wd->params, params, size);
- atomic_inc(&data->workqueue_size);
+ s = atomic_inc_return(&data->workqueue_size);
queue_work(data->wq, &wd->work);
/* warn about excessive queue size */
- s = atomic_read(&data->workqueue_size);
if (s >= 20 && s % 20 == 0)
hid_warn(data->hidpp->hid_dev, "Force feedback command queue contains %d commands, causing substantial delays!", s);
--
2.30.2
next reply other threads:[~2021-07-23 15:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-23 15:41 Christophe JAILLET [this message]
2021-08-20 12:21 ` [PATCH] HID: logitech-hidpp: Use 'atomic_inc_return' instead of hand-writing it Jiri Kosina
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