linux-kernel - [RFT PATCH 4/4] usb: dwc2: Make "trimming xfer length" a debug message

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Message-Id: <20200226210414.28133-5-linux@roeck-us.net>
Date:   Wed, 26 Feb 2020 13:04:14 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Minas Harutyunyan <hminas@...opsys.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Antti Seppälä <a.seppala@...il.com>,
        Boris ARZUR <boris@...bu.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [RFT PATCH 4/4] usb: dwc2: Make "trimming xfer length" a debug message

With some USB network adapters, such as DM96xx, the following message
is seen for each maximum size receive packet.

dwc2 ff540000.usb: dwc2_update_urb_state(): trimming xfer length

This happens because the packet size requested by the driver is 1522
bytes, wMaxPacketSize is 64, the dwc2 driver configures the chip to
receive 24*64 = 1536 bytes, and the chip does indeed send more than
1522 bytes of data. Since the event does not indicate an error condition,
the message is just noise. Demote it to debug level.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/usb/dwc2/hcd_intr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 12819e019e13..d5f4ec1b73b1 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -500,7 +500,7 @@ static int dwc2_update_urb_state(struct dwc2_hsotg *hsotg,
 						      &short_read);
 
 	if (urb->actual_length + xfer_length > urb->length) {
-		dev_warn(hsotg->dev, "%s(): trimming xfer length\n", __func__);
+		dev_dbg(hsotg->dev, "%s(): trimming xfer length\n", __func__);
 		xfer_length = urb->length - urb->actual_length;
 	}
 
-- 
2.17.1