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mt76: usb: introduce disable_usb_sg parameter

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Add disable_usb_sg module parameter to disable scatter-gather on demand

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi 2019-02-12 14:42:42 +01:00 • committed by Felix Fietkau
parent f752294946
commit c2908a0dfd
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/mediatek/mt76/usb.c
View file

@ -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));
}