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uas: improve device reset

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Add new function to unlink and abort requests from the work
list, call it on bus reset and disconnect where we kill all
in-flight urbs.  Also reorder calls in disconnect to first
cancel transfers, then remove the scsi hba.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gerd Hoffmann 2012-11-30 11:54:44 +01:00 committed by Greg Kroah-Hartman
parent 5d390403fe
commit 4c456971f8
1 changed files with 44 additions and 1 deletions
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45
drivers/usb/storage/uas.c
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@ -84,6 +84,7 @@ struct uas_cmd_info {
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
struct uas_dev_info *devinfo, gfp_t gfp);
static void uas_do_work(struct work_struct *work);
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
static DECLARE_WORK(uas_work, uas_do_work);
static DEFINE_SPINLOCK(uas_work_lock);
@ -145,6 +146,45 @@ static void uas_do_work(struct work_struct *work)
}
}
static void uas_abort_work(struct uas_dev_info *devinfo)
{
struct uas_cmd_info *cmdinfo;
struct uas_cmd_info *temp;
struct list_head list;
unsigned long flags;
spin_lock_irq(&uas_work_lock);
list_replace_init(&uas_work_list, &list);
spin_unlock_irq(&uas_work_lock);
spin_lock_irqsave(&devinfo->lock, flags);
list_for_each_entry_safe(cmdinfo, temp, &list, list) {
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp,
struct scsi_cmnd, SCp);
struct uas_dev_info *di = (void *)cmnd->device->hostdata;
if (di == devinfo) {
cmdinfo->state |= COMMAND_ABORTED;
cmdinfo->state &= ~IS_IN_WORK_LIST;
if (devinfo->resetting) {
/* uas_stat_cmplt() will not do that
* when a device reset is in
* progress */
cmdinfo->state &= ~COMMAND_INFLIGHT;
}
uas_try_complete(cmnd, __func__);
} else {
/* not our uas device, relink into list */
list_del(&cmdinfo->list);
spin_lock_irq(&uas_work_lock);
list_add_tail(&cmdinfo->list, &uas_work_list);
spin_unlock_irq(&uas_work_lock);
}
}
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
{
struct sense_iu *sense_iu = urb->transfer_buffer;
@ -750,6 +790,7 @@ static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
int err;
devinfo->resetting = 1;
uas_abort_work(devinfo);
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
usb_kill_anchored_urbs(&devinfo->sense_urbs);
usb_kill_anchored_urbs(&devinfo->data_urbs);
@ -995,10 +1036,12 @@ static void uas_disconnect(struct usb_interface *intf)
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
scsi_remove_host(shost);
devinfo->resetting = 1;
uas_abort_work(devinfo);
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
usb_kill_anchored_urbs(&devinfo->sense_urbs);
usb_kill_anchored_urbs(&devinfo->data_urbs);
scsi_remove_host(shost);
uas_free_streams(devinfo);
kfree(devinfo);
}