diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2013-11-11 11:51:42 +0100 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2014-03-04 15:38:21 -0800 |
| commit | da65c2bb99542d05f2d8f67efe6627915f4c5ea4 (patch) | |
| tree | 5da639fe4034ea9bd1a3e5426f822cac6e1247fe /drivers/usb/storage/uas.c | |
| parent | 0df1f663f32e5dc28cba68375b09bba5eaad103f (diff) | |
| download | linux-da65c2bb99542d05f2d8f67efe6627915f4c5ea4.tar.gz | |
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>
Diffstat (limited to 'drivers/usb/storage/uas.c')
| -rw-r--r-- | drivers/usb/storage/uas.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 7a16ed8e8aac91..019f2030ea0c14 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -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, }; |