6.14-stable review patch. If anyone has any objections, please let me know.
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From: Prashanth K prashanth.k@oss.qualcomm.com
commit 5977a58dd5a4865198b0204b998adb0f634abe19 upstream.
Currently when the host sends GET_STATUS request for an interface, we use get_status callbacks to set/clear remote wakeup capability of that interface. And if get_status callback isn't present for that interface, then we assume its remote wakeup capability based on bmAttributes.
Now consider a scenario, where we have a USB configuration with multiple interfaces (say ECM + ADB), here ECM is remote wakeup capable and as of now ADB isn't. And bmAttributes will indicate the device as wakeup capable. With the current implementation, when host sends GET_STATUS request for both interfaces, we will set FUNC_RW_CAP for both. This results in USB3 CV Chapter 9.15 (Function Remote Wakeup Test) failures as host expects remote wakeup from both interfaces.
The above scenario is just an example, and the failure can be observed if we use configuration with any interface except ECM. Hence avoid configuring remote wakeup capability from composite driver based on bmAttributes, instead use get_status callbacks and let the function drivers decide this.
Cc: stable stable@kernel.org Fixes: 481c225c4802 ("usb: gadget: Handle function suspend feature selector") Signed-off-by: Prashanth K prashanth.k@oss.qualcomm.com Reviewed-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/20250422103231.1954387-3-prashanth.k@oss.qualcomm.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/composite.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-)
--- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -2011,15 +2011,13 @@ composite_setup(struct usb_gadget *gadge
if (f->get_status) { status = f->get_status(f); + if (status < 0) break; - } else { - /* Set D0 and D1 bits based on func wakeup capability */ - if (f->config->bmAttributes & USB_CONFIG_ATT_WAKEUP) { - status |= USB_INTRF_STAT_FUNC_RW_CAP; - if (f->func_wakeup_armed) - status |= USB_INTRF_STAT_FUNC_RW; - } + + /* if D5 is not set, then device is not wakeup capable */ + if (!(f->config->bmAttributes & USB_CONFIG_ATT_WAKEUP)) + status &= ~(USB_INTRF_STAT_FUNC_RW_CAP | USB_INTRF_STAT_FUNC_RW); }
put_unaligned_le16(status & 0x0000ffff, req->buf);