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uas: Disable uas on ASM1051 devices 

There are a large numbers of issues with ASM1051 devices in uas mode:

1) They do not support REPORT SUPPORTED OPERATION CODES

2) They use out of spec 8 byte status iu-s when they have no sense data,
   switching to normal 16 byte status iu-s when they do have sense data.

3) They hang / crash when combined with some disks, e.g. a Crucial M500 ssd.

4) They hang / crash when stressed (through e.g. sg_reset --bus) with disks
   with which then normally do work (once 1 & 2 are worked around).

Where as in BOT mode they appear to work fine, so the best way forward with
these devices is to just blacklist them for uas usage.

Unfortunately this is easier said then done. as older versions of the ASM1053
(which works fine) use the same usb-id as the ASM1051.

When connected over USB-3 the 2 can be told apart by the number of streams
they support. So this patch adds some less then pretty code to disable uas for
the ASM1051. When connected over USB-2, simply disable uas alltogether for
devices with the shared usb-id.

Cc: stable@vger.kernel.org # 3.16
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2014-09-10 10:51:36 +02:00 committed by Greg Kroah-Hartman
parent 604eac3c0c
commit a9c54caa45
1 changed files with 23 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/usb/storage/uas-detect.h
View File

@ -59,10 +59,6 @@ static int uas_use_uas_driver(struct usb_interface *intf,
unsigned long flags = id->driver_info;
int r, alt;
usb_stor_adjust_quirks(udev, &flags);
if (flags & US_FL_IGNORE_UAS)
return 0;
alt = uas_find_uas_alt_setting(intf);
if (alt < 0)
@ -72,6 +68,29 @@ static int uas_use_uas_driver(struct usb_interface *intf,
if (r < 0)
return 0;
/*
* ASM1051 and older ASM1053 devices have the same usb-id, and UAS is
* broken on the ASM1051, use the number of streams to differentiate.
* New ASM1053-s also support 32 streams, but have a different prod-id.
*/
if (udev->descriptor.idVendor == 0x174c &&
udev->descriptor.idProduct == 0x55aa) {
if (udev->speed < USB_SPEED_SUPER) {
/* No streams info, assume ASM1051 */
flags |= US_FL_IGNORE_UAS;
} else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) {
flags |= US_FL_IGNORE_UAS;
}
}
usb_stor_adjust_quirks(udev, &flags);
if (flags & US_FL_IGNORE_UAS) {
dev_warn(&udev->dev,
"UAS is blacklisted for this device, using usb-storage instead\n");
return 0;
}
if (udev->bus->sg_tablesize == 0) {
dev_warn(&udev->dev,
"The driver for the USB controller %s does not support scatter-gather which is\n",