[PATCH v4 23/40] usb: cdc-acm: optimize acm_softint()

Yury Norov
2024-06-20T17:58:15Z

acm_softint() uses for-loop to traverse urbs_in_error_delay bitmap
bit by bit to find and clear set bits.

Simplify it by using for_each_test_and_clear_bit(), because it doesn't
test already clear bits.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
---
drivers/usb/class/cdc-acm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 0e7439dba8fe..f8940f0d7ad8 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -18,6 +18,7 @@
#undef DEBUG
#undef VERBOSE_DEBUG

+#include <linux/find_atomic.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/errno.h>
@@ -613,9 +614,8 @@ static void acm_softint(struct work_struct *work)
}

if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
- for (i = 0; i < acm->rx_buflimit; i++)
- if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
- acm_submit_read_urb(acm, i, GFP_KERNEL);
+ for_each_test_and_clear_bit(i, &acm->urbs_in_error_delay, acm->rx_buflimit)
+ acm_submit_read_urb(acm, i, GFP_KERNEL);
}

if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
--
2.43.0