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uas: Reset device on reboot 

Some BIOS-es will hang on reboot when an uas device is attached and left in
uas mode on reboot.

This commit adds a shutdown handler which on reboot puts the device back into
usb-storage mode, fixing the hang on reboot on these systems.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Hans de Goede 2013-11-11 11:51:42 +01:00 committed by Sarah Sharp
parent 0df1f663f3
commit da65c2bb99
1 changed files with 30 additions and 0 deletions
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30
drivers/usb/storage/uas.c
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@ -54,6 +54,7 @@ struct uas_dev_info {
unsigned use_streams:1;
unsigned uas_sense_old:1;
unsigned running_task:1;
unsigned shutdown:1;
struct scsi_cmnd *cmnd;
spinlock_t lock;
struct work_struct work;
@ -1011,6 +1012,7 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
devinfo->udev = udev;
devinfo->resetting = 0;
devinfo->running_task = 0;
devinfo->shutdown = 0;
init_usb_anchor(&devinfo->cmd_urbs);
init_usb_anchor(&devinfo->sense_urbs);
init_usb_anchor(&devinfo->data_urbs);
@ -1053,6 +1055,9 @@ static int uas_pre_reset(struct usb_interface *intf)
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
unsigned long flags;
if (devinfo->shutdown)
return 0;
/* Block new requests */
spin_lock_irqsave(shost->host_lock, flags);
scsi_block_requests(shost);
@ -1076,6 +1081,9 @@ static int uas_post_reset(struct usb_interface *intf)
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
unsigned long flags;
if (devinfo->shutdown)
return 0;
if (uas_configure_endpoints(devinfo) != 0) {
shost_printk(KERN_ERR, shost,
"%s: alloc streams error after reset", __func__);
@ -1147,6 +1155,27 @@ static void uas_disconnect(struct usb_interface *intf)
kfree(devinfo);
}
/*
* Put the device back in usb-storage mode on shutdown, as some BIOS-es
* hang on reboot when the device is still in uas mode. Note the reset is
* necessary as some devices won't revert to usb-storage mode without it.
*/
static void uas_shutdown(struct device *dev)
{
struct usb_interface *intf = to_usb_interface(dev);
struct usb_device *udev = interface_to_usbdev(intf);
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
if (system_state != SYSTEM_RESTART)
return;
devinfo->shutdown = 1;
uas_free_streams(devinfo);
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
usb_reset_device(udev);
}
static struct usb_driver uas_driver = {
.name = "uas",
.probe = uas_probe,
@ -1156,6 +1185,7 @@ static struct usb_driver uas_driver = {
.suspend = uas_suspend,
.resume = uas_resume,
.reset_resume = uas_reset_resume,
.drvwrap.driver.shutdown = uas_shutdown,
.id_table = uas_usb_ids,
};