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storage: accept some UAS devices if streams are unavailable

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On some older XHCIs streams are not supported and the UAS driver
will fail at probe time. For those devices storage should try
to bind to UAS devices.
This patch adds a flag for stream support to HCDs and evaluates
it.

[Note: Sarah fixed a bug where the USB 2.0 root hub, not USB 3.0 root
hub would get marked as being able to support streams.]

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Oliver Neukum
2014-02-11 20:36:04 +01:00
committed by Sarah Sharp
parent 21d0e51bfb
commit 14aec58932
4 changed files with 11 additions and 0 deletions
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4
drivers/usb/storage/uas-detect.h
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@@ -72,6 +72,7 @@ static int uas_use_uas_driver(struct usb_interface *intf,
{
struct usb_host_endpoint *eps[4] = { };
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
unsigned long flags = id->driver_info;
int r, alt;
@@ -80,6 +81,9 @@ static int uas_use_uas_driver(struct usb_interface *intf,
if (flags & US_FL_IGNORE_UAS)
return 0;
if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams)
return 0;
alt = uas_find_uas_alt_setting(intf);
if (alt < 0)
return 0;