[PATCH] can: etas_es58x: remove useless calls to usb_fill_bulk_urb()

[PATCH] can: etas_es58x: remove useless calls to usb_fill_bulk_urb()

[Vincent Mailhol]

Aside of urb->transfer_buffer_length and urb->context which might
change in the TX path, all the other URB parameters remains constant
during runtime. So, there is no reasons to call usb_fill_bulk_urb()
each time before submitting an URB.

Make sure to initialize all the fields of the URB at allocation
time. For the TX branch, replace the call usb_fill_bulk_urb() by an
assignment of urb->context. urb->urb->transfer_buffer_length is
already set by the caller functions, no need to set it again. For the
RX branch, because all parameters are unchanged, simply remove the
call to usb_fill_bulk_urb().

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
 drivers/net/can/usb/etas_es58x/es58x_core.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.c b/drivers/net/can/usb/etas_es58x/es58x_core.c
index 3b949e979583..51294b717040 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@@ -1460,10 +1460,6 @@ static void es58x_read_bulk_callback(struct urb *urb)
 	}
 
  resubmit_urb:
-	usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->rx_pipe,
-			  urb->transfer_buffer, urb->transfer_buffer_length,
-			  es58x_read_bulk_callback, es58x_dev);
-
 	ret = usb_submit_urb(urb, GFP_ATOMIC);
 	if (ret == -ENODEV) {
 		for (i = 0; i < es58x_dev->num_can_ch; i++)
@@ -1597,7 +1593,8 @@ static struct urb *es58x_get_tx_urb(struct es58x_device *es58x_dev)
 			return NULL;
 
 		usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->tx_pipe,
-				  buf, tx_buf_len, NULL, NULL);
+				  buf, tx_buf_len, es58x_write_bulk_callback,
+				  NULL);
 		return urb;
 	}
 
@@ -1630,9 +1627,7 @@ static int es58x_submit_urb(struct es58x_device *es58x_dev, struct urb *urb,
 	int ret;
 
 	es58x_set_crc(urb->transfer_buffer, urb->transfer_buffer_length);
-	usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->tx_pipe,
-			  urb->transfer_buffer, urb->transfer_buffer_length,
-			  es58x_write_bulk_callback, netdev);
+	urb->context = netdev;
 	usb_anchor_urb(urb, &es58x_dev->tx_urbs_busy);
 	ret = usb_submit_urb(urb, GFP_ATOMIC);
 	if (ret) {
-- 
2.35.1

Re: [PATCH] can: etas_es58x: remove useless calls to usb_fill_bulk_urb()

[Marc Kleine-Budde]

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On 29.07.2022 17:09:02, Vincent Mailhol wrote:
> Aside of urb->transfer_buffer_length and urb->context which might
> change in the TX path, all the other URB parameters remains constant
> during runtime. So, there is no reasons to call usb_fill_bulk_urb()
> each time before submitting an URB.
> 
> Make sure to initialize all the fields of the URB at allocation
> time. For the TX branch, replace the call usb_fill_bulk_urb() by an
> assignment of urb->context. urb->urb->transfer_buffer_length is
> already set by the caller functions, no need to set it again. For the
> RX branch, because all parameters are unchanged, simply remove the
> call to usb_fill_bulk_urb().
> 
> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

Applied to linux-can-next/master

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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