linux-kernel - question about usb_rebind

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Message-ID: <20171117163551.35u3jhimpow2ghw2@cantor>
Date:   Fri, 17 Nov 2017 09:35:51 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: question about usb_rebind_intf

Should this skip warning that the rebind failed if device_attach
is returning -EPROBE_DEFER? If I do something like 'rtcwake -m mem -s 30'
on a laptop I have here I will see a couple "rebind failed: -517" messages
as it comes back out of suspend. Since the device probe eventually happens
once probes are not deferred wondering if this warning this be given in that
case.

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 64262a9a8829..5d3408010112 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1070,7 +1070,7 @@ static void usb_rebind_intf(struct usb_interface *intf)
        if (!intf->dev.power.is_prepared) {
                intf->needs_binding = 0;
                rc = device_attach(&intf->dev);
-               if (rc < 0)
+               if (rc < 0 && rc != -EPROBE_DEFER)
                        dev_warn(&intf->dev, "rebind failed: %d\n", rc);
        }
 }