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path: root/drivers/usb/storage/uas.c
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Diffstat (limited to 'drivers/usb/storage/uas.c')
-rw-r--r--drivers/usb/storage/uas.c124
1 files changed, 108 insertions, 16 deletions
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 98b98ee..d966b59 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -66,6 +66,8 @@ enum {
DATA_OUT_URB_INFLIGHT = (1 << 10),
COMMAND_COMPLETED = (1 << 11),
COMMAND_ABORTED = (1 << 12),
+ UNLINK_DATA_URBS = (1 << 13),
+ IS_IN_WORK_LIST = (1 << 14),
};
/* Overrides scsi_pointer */
@@ -82,11 +84,36 @@ 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);
static LIST_HEAD(uas_work_list);
+static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
+ struct uas_cmd_info *cmdinfo)
+{
+ unsigned long flags;
+
+ /*
+ * The UNLINK_DATA_URBS flag makes sure uas_try_complete
+ * (called by urb completion) doesn't release cmdinfo
+ * underneath us.
+ */
+ spin_lock_irqsave(&devinfo->lock, flags);
+ cmdinfo->state |= UNLINK_DATA_URBS;
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+
+ if (cmdinfo->data_in_urb)
+ usb_unlink_urb(cmdinfo->data_in_urb);
+ if (cmdinfo->data_out_urb)
+ usb_unlink_urb(cmdinfo->data_out_urb);
+
+ spin_lock_irqsave(&devinfo->lock, flags);
+ cmdinfo->state &= ~UNLINK_DATA_URBS;
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+}
+
static void uas_do_work(struct work_struct *work)
{
struct uas_cmd_info *cmdinfo;
@@ -106,6 +133,8 @@ static void uas_do_work(struct work_struct *work)
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
spin_lock_irqsave(&devinfo->lock, flags);
err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
+ if (!err)
+ cmdinfo->state &= ~IS_IN_WORK_LIST;
spin_unlock_irqrestore(&devinfo->lock, flags);
if (err) {
list_del(&cmdinfo->list);
@@ -117,6 +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;
@@ -168,7 +236,7 @@ static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
struct uas_cmd_info *ci = (void *)&cmnd->SCp;
scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
- "%s%s%s%s%s%s%s%s%s%s%s%s\n",
+ "%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
caller, cmnd, cmnd->request->tag,
(ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
(ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
@@ -181,7 +249,9 @@ static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
(ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
(ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
(ci->state & COMMAND_COMPLETED) ? " done" : "",
- (ci->state & COMMAND_ABORTED) ? " abort" : "");
+ (ci->state & COMMAND_ABORTED) ? " abort" : "",
+ (ci->state & UNLINK_DATA_URBS) ? " unlink": "",
+ (ci->state & IS_IN_WORK_LIST) ? " work" : "");
}
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
@@ -192,7 +262,8 @@ static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
WARN_ON(!spin_is_locked(&devinfo->lock));
if (cmdinfo->state & (COMMAND_INFLIGHT |
DATA_IN_URB_INFLIGHT |
- DATA_OUT_URB_INFLIGHT))
+ DATA_OUT_URB_INFLIGHT |
+ UNLINK_DATA_URBS))
return -EBUSY;
BUG_ON(cmdinfo->state & COMMAND_COMPLETED);
cmdinfo->state |= COMMAND_COMPLETED;
@@ -217,6 +288,7 @@ static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
if (err) {
spin_lock(&uas_work_lock);
list_add_tail(&cmdinfo->list, &uas_work_list);
+ cmdinfo->state |= IS_IN_WORK_LIST;
spin_unlock(&uas_work_lock);
schedule_work(&uas_work);
}
@@ -274,16 +346,9 @@ static void uas_stat_cmplt(struct urb *urb)
uas_sense(urb, cmnd);
if (cmnd->result != 0) {
/* cancel data transfers on error */
- if (cmdinfo->state & DATA_IN_URB_INFLIGHT) {
- spin_unlock_irqrestore(&devinfo->lock, flags);
- usb_unlink_urb(cmdinfo->data_in_urb);
- spin_lock_irqsave(&devinfo->lock, flags);
- }
- if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) {
- spin_unlock_irqrestore(&devinfo->lock, flags);
- usb_unlink_urb(cmdinfo->data_out_urb);
- spin_lock_irqsave(&devinfo->lock, flags);
- }
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+ uas_unlink_data_urbs(devinfo, cmdinfo);
+ spin_lock_irqsave(&devinfo->lock, flags);
}
cmdinfo->state &= ~COMMAND_INFLIGHT;
uas_try_complete(cmnd, __func__);
@@ -579,6 +644,12 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
+ if (devinfo->resetting) {
+ cmnd->result = DID_ERROR << 16;
+ cmnd->scsi_done(cmnd);
+ return 0;
+ }
+
spin_lock_irqsave(&devinfo->lock, flags);
if (devinfo->cmnd) {
spin_unlock_irqrestore(&devinfo->lock, flags);
@@ -623,6 +694,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
}
spin_lock(&uas_work_lock);
list_add_tail(&cmdinfo->list, &uas_work_list);
+ cmdinfo->state |= IS_IN_WORK_LIST;
spin_unlock(&uas_work_lock);
schedule_work(&uas_work);
}
@@ -689,8 +761,23 @@ static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
uas_log_cmd_state(cmnd, __func__);
spin_lock_irqsave(&devinfo->lock, flags);
cmdinfo->state |= COMMAND_ABORTED;
- spin_unlock_irqrestore(&devinfo->lock, flags);
- ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
+ if (cmdinfo->state & IS_IN_WORK_LIST) {
+ spin_lock(&uas_work_lock);
+ list_del(&cmdinfo->list);
+ cmdinfo->state &= ~IS_IN_WORK_LIST;
+ spin_unlock(&uas_work_lock);
+ }
+ if (cmdinfo->state & COMMAND_INFLIGHT) {
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+ ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
+ } else {
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+ uas_unlink_data_urbs(devinfo, cmdinfo);
+ spin_lock_irqsave(&devinfo->lock, flags);
+ uas_try_complete(cmnd, __func__);
+ spin_unlock_irqrestore(&devinfo->lock, flags);
+ ret = SUCCESS;
+ }
return ret;
}
@@ -709,6 +796,7 @@ 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);
@@ -903,6 +991,8 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
shost->max_cmd_len = 16 + 252;
shost->max_id = 1;
+ shost->max_lun = 256;
+ shost->max_channel = 0;
shost->sg_tablesize = udev->bus->sg_tablesize;
devinfo->intf = intf;
@@ -954,10 +1044,12 @@ 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);
}
generated by cgit v0.10.2 at 2024-08-07 09:57:03 (GMT)