diff mbox series

[RESEND,4/4] mt76: usb: introduce disable_usb_sg parameter

Message ID de432354252ddaec04ac99f7cb23defb7909511d.1549977282.git.lorenzo@kernel.org (mailing list archive)
State Accepted
Delegated to: Kalle Valo
Headers show
Series do not use sg if not properly supported by usb controller | expand

Commit Message

Lorenzo Bianconi Feb. 12, 2019, 1:42 p.m. UTC 
From: Lorenzo Bianconi <lorenzo@kernel.org>

Add disable_usb_sg module parameter to disable scatter-gather on demand

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/wireless/mediatek/mt76/usb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index 7e7da6b49a88..78191968b4fa 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -22,6 +22,10 @@ 
 #define MT_VEND_REQ_MAX_RETRY	10
 #define MT_VEND_REQ_TOUT_MS	300
 
+static bool disable_usb_sg;
+module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644);
+MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support");
+
 /* should be called with usb_ctrl_mtx locked */
 static int __mt76u_vendor_request(struct mt76_dev *dev, u8 req,
 				  u8 req_type, u16 val, u16 offset,
@@ -246,7 +250,7 @@  static bool mt76u_check_sg(struct mt76_dev *dev)
 	struct usb_interface *intf = to_usb_interface(dev->dev);
 	struct usb_device *udev = interface_to_usbdev(intf);
 
-	return (udev->bus->sg_tablesize > 0 &&
+	return (!disable_usb_sg && udev->bus->sg_tablesize > 0 &&
 		(udev->bus->no_sg_constraint ||
 		 udev->speed == USB_SPEED_WIRELESS));
 }