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@xxxxxxxxxxxxx>
---
drivers/staging/most/hdm-usb/hdm_usb.c | 62 ++++++++++++++++------------------
1 file changed, 29 insertions(+), 33 deletions(-)
diff --git a/drivers/staging/most/hdm-usb/hdm_usb.c b/drivers/staging/most/hdm-usb/hdm_usb.c
index 52d66d4..86bf978 100644
--- a/drivers/staging/most/hdm-usb/hdm_usb.c
+++ b/drivers/staging/most/hdm-usb/hdm_usb.c
@@ -65,19 +65,15 @@
/**
* struct buf_anchor - used to create a list of pending URBs
* @urb: pointer to USB request block
- * @clear_work_obj:
* @list: linked list
* @urb_completion:
*/
struct buf_anchor {
struct urb *urb;
- struct work_struct clear_work_obj;
struct list_head list;
struct completion urb_compl;
};
-#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
-
/**
* struct most_dci_obj - Direct Communication Interface
* @kobj:position in sysfs
@@ -90,6 +86,17 @@ struct most_dci_obj {
#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
+struct most_dev;
+
+struct clear_hold_work {
+ struct work_struct ws;
+ struct most_dev *mdev;
+ unsigned int channel;
+ int pipe;
+};
+
+#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
+
/**
* struct most_dev - holds all usb interface specific stuff
* @parent: parent object in sysfs
@@ -126,6 +133,7 @@ struct most_dev {
spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
bool padding_active[MAX_NUM_ENDPOINTS];
bool is_channel_healthy[MAX_NUM_ENDPOINTS];
+ struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
struct list_head *anchor_list;
struct mutex io_mutex;
struct timer_list link_stat_timer;
@@ -222,7 +230,6 @@ static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel,
}
spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
list_del(&anchor->list);
- cancel_work_sync(&anchor->clear_work_obj);
kfree(anchor);
}
spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
@@ -289,6 +296,8 @@ static int hdm_poison_channel(struct most_interface *iface, int channel)
mdev->is_channel_healthy[channel] = false;
+ cancel_work_sync(&mdev->clear_work[channel].ws);
+
mutex_lock(&mdev->io_mutex);
free_anchored_buffers(mdev, channel, MBO_E_CLOSE);
if (mdev->padding_active[channel])
@@ -409,9 +418,8 @@ static void hdm_write_completion(struct urb *urb)
dev_warn(dev, "Broken OUT pipe detected\n");
most_stop_enqueue(&mdev->iface, channel);
mbo->status = MBO_E_INVAL;
- usb_unlink_urb(urb);
- INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
- schedule_work(&anchor->clear_work_obj);
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
return;
case -ENODEV:
case -EPROTO:
@@ -573,9 +581,8 @@ static void hdm_read_completion(struct urb *urb)
case -EPIPE:
dev_warn(dev, "Broken IN pipe detected\n");
mbo->status = MBO_E_INVAL;
- usb_unlink_urb(urb);
- INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
- schedule_work(&anchor->clear_work_obj);
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
return;
case -ENODEV:
case -EPROTO:
@@ -737,6 +744,9 @@ static int hdm_configure_channel(struct most_interface *iface, int channel,
mdev = to_mdev(iface);
mdev->is_channel_healthy[channel] = true;
+ mdev->clear_work[channel].channel = channel;
+ mdev->clear_work[channel].mdev = mdev;
+ INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
dev = &mdev->usb_device->dev;
if (unlikely(!iface || !conf)) {
@@ -918,33 +928,19 @@ static void wq_netinfo(struct work_struct *wq_obj)
*/
static void wq_clear_halt(struct work_struct *wq_obj)
{
- struct buf_anchor *anchor;
- struct most_dev *mdev;
- struct mbo *mbo;
- struct urb *urb;
- unsigned int channel;
- unsigned long flags;
+ struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
+ struct most_dev *mdev = clear_work->mdev;
+ unsigned int channel = clear_work->channel;
+ int pipe = clear_work->pipe;
- anchor = to_buf_anchor(wq_obj);
- urb = anchor->urb;
- mbo = urb->context;
- mdev = to_mdev(mbo->ifp);
- channel = mbo->hdm_channel_id;
-
- if (usb_clear_halt(urb->dev, urb->pipe))
+ mutex_lock(&mdev->io_mutex);
+ free_anchored_buffers(mdev, channel, MBO_E_INVAL);
+ if (usb_clear_halt(mdev->usb_device, pipe))
dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
- usb_free_urb(urb);
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
if (mdev->conf[channel].direction & MOST_CH_TX)
most_resume_enqueue(&mdev->iface, channel);
-
- kfree(anchor);
+ mutex_unlock(&mdev->io_mutex);
}
/**
--
1.9.1
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