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staging: most: hdm-usb: fix clear halt processing
This patch is needed to ensure that submitted URBs get unlinked before the driver calls usb_clear_halt(). Since the halt condition of an USB endpoint is channel related, the work_struct is moved from a buffer basis to a channel basis. Signed-off-by: Christian Gromm <christian.gromm@microchip.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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9ed745ff8e
commit
cc28983c32
1 changed files with 29 additions and 33 deletions
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@ -65,19 +65,15 @@
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/**
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* struct buf_anchor - used to create a list of pending URBs
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* @urb: pointer to USB request block
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* @clear_work_obj:
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* @list: linked list
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* @urb_completion:
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*/
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struct buf_anchor {
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struct urb *urb;
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struct work_struct clear_work_obj;
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struct list_head list;
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struct completion urb_compl;
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};
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#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
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/**
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* struct most_dci_obj - Direct Communication Interface
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* @kobj:position in sysfs
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@ -90,6 +86,17 @@ struct most_dci_obj {
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#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
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struct most_dev;
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struct clear_hold_work {
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struct work_struct ws;
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struct most_dev *mdev;
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unsigned int channel;
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int pipe;
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};
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#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
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/**
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* struct most_dev - holds all usb interface specific stuff
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* @parent: parent object in sysfs
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@ -126,6 +133,7 @@ struct most_dev {
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spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
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bool padding_active[MAX_NUM_ENDPOINTS];
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bool is_channel_healthy[MAX_NUM_ENDPOINTS];
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struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
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struct list_head *anchor_list;
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struct mutex io_mutex;
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struct timer_list link_stat_timer;
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@ -222,7 +230,6 @@ static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel,
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}
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spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
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list_del(&anchor->list);
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cancel_work_sync(&anchor->clear_work_obj);
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kfree(anchor);
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}
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spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
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@ -289,6 +296,8 @@ static int hdm_poison_channel(struct most_interface *iface, int channel)
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mdev->is_channel_healthy[channel] = false;
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cancel_work_sync(&mdev->clear_work[channel].ws);
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mutex_lock(&mdev->io_mutex);
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free_anchored_buffers(mdev, channel, MBO_E_CLOSE);
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if (mdev->padding_active[channel])
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@ -409,9 +418,8 @@ static void hdm_write_completion(struct urb *urb)
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dev_warn(dev, "Broken OUT pipe detected\n");
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most_stop_enqueue(&mdev->iface, channel);
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mbo->status = MBO_E_INVAL;
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usb_unlink_urb(urb);
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INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
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schedule_work(&anchor->clear_work_obj);
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mdev->clear_work[channel].pipe = urb->pipe;
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schedule_work(&mdev->clear_work[channel].ws);
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return;
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case -ENODEV:
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case -EPROTO:
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@ -573,9 +581,8 @@ static void hdm_read_completion(struct urb *urb)
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case -EPIPE:
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dev_warn(dev, "Broken IN pipe detected\n");
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mbo->status = MBO_E_INVAL;
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usb_unlink_urb(urb);
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INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
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schedule_work(&anchor->clear_work_obj);
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mdev->clear_work[channel].pipe = urb->pipe;
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schedule_work(&mdev->clear_work[channel].ws);
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return;
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case -ENODEV:
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case -EPROTO:
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@ -735,6 +742,9 @@ static int hdm_configure_channel(struct most_interface *iface, int channel,
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mdev = to_mdev(iface);
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mdev->is_channel_healthy[channel] = true;
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mdev->clear_work[channel].channel = channel;
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mdev->clear_work[channel].mdev = mdev;
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INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
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dev = &mdev->usb_device->dev;
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if (unlikely(!iface || !conf)) {
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@ -916,33 +926,19 @@ static void wq_netinfo(struct work_struct *wq_obj)
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*/
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static void wq_clear_halt(struct work_struct *wq_obj)
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{
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struct buf_anchor *anchor;
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struct most_dev *mdev;
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struct mbo *mbo;
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struct urb *urb;
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unsigned int channel;
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unsigned long flags;
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struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
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struct most_dev *mdev = clear_work->mdev;
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unsigned int channel = clear_work->channel;
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int pipe = clear_work->pipe;
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anchor = to_buf_anchor(wq_obj);
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urb = anchor->urb;
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mbo = urb->context;
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mdev = to_mdev(mbo->ifp);
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channel = mbo->hdm_channel_id;
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if (usb_clear_halt(urb->dev, urb->pipe))
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mutex_lock(&mdev->io_mutex);
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free_anchored_buffers(mdev, channel, MBO_E_INVAL);
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if (usb_clear_halt(mdev->usb_device, pipe))
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dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
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usb_free_urb(urb);
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spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
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list_del(&anchor->list);
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spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
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if (likely(mbo->complete))
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mbo->complete(mbo);
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if (mdev->conf[channel].direction & MOST_CH_TX)
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most_resume_enqueue(&mdev->iface, channel);
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kfree(anchor);
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mutex_unlock(&mdev->io_mutex);
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}
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/**
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