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authorPete Zaitcev <zaitcev@redhat.com>2007-06-08 13:37:49 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-12 16:34:31 -0700
commit9f6a93f7bbb6d73ca0e43c000f3bbf521cd4f782 (patch)
tree50b53635eb5ca5b615b33aa3a00c7f155e691484
parent60aac1ec26b960fe77bf600457bc6c06f8aa7db4 (diff)
usb: free DMA mappings if enqueue fails
This patch releases DMA resources if enqueue fails in the HCD. Linux had this bug ever since we converted from virt_to_bus for 2.4. It is difficult to hit. A user would need a significant memory pressure or some other unusual condition. It was reported to me by IBM. They ran a management application for RSA II adapters which sent Bulk requests to an Interrupt endpoint. Submissions got rejected by HCD due to an invalid interval value and the swiotlb pool became depleted in the matter of hours. We fixed the invalid interval issue in devio.c separately, but this seems to be a bug worth fixing as well. Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/hcd.c47
1 files changed, 20 insertions, 27 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index e5058fb26a7..3df538539b4 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -903,17 +903,32 @@ EXPORT_SYMBOL (usb_calc_bus_time);
/*-------------------------------------------------------------------------*/
-static void urb_unlink (struct urb *urb)
+static void urb_unlink(struct usb_hcd *hcd, struct urb *urb)
{
unsigned long flags;
+ int at_root_hub = (urb->dev == hcd->self.root_hub);
/* clear all state linking urb to this dev (and hcd) */
-
spin_lock_irqsave (&hcd_data_lock, flags);
list_del_init (&urb->urb_list);
spin_unlock_irqrestore (&hcd_data_lock, flags);
-}
+ if (hcd->self.uses_dma && !at_root_hub) {
+ if (usb_pipecontrol (urb->pipe)
+ && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
+ dma_unmap_single (hcd->self.controller, urb->setup_dma,
+ sizeof (struct usb_ctrlrequest),
+ DMA_TO_DEVICE);
+ if (urb->transfer_buffer_length != 0
+ && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
+ dma_unmap_single (hcd->self.controller,
+ urb->transfer_dma,
+ urb->transfer_buffer_length,
+ usb_pipein (urb->pipe)
+ ? DMA_FROM_DEVICE
+ : DMA_TO_DEVICE);
+ }
+}
/* may be called in any context with a valid urb->dev usecount
* caller surrenders "ownership" of urb
@@ -1016,7 +1031,7 @@ doit:
status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
done:
if (unlikely (status)) {
- urb_unlink (urb);
+ urb_unlink(hcd, urb);
atomic_dec (&urb->use_count);
if (urb->reject)
wake_up (&usb_kill_urb_queue);
@@ -1400,29 +1415,7 @@ EXPORT_SYMBOL (usb_bus_start_enum);
*/
void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb)
{
- int at_root_hub;
-
- at_root_hub = (urb->dev == hcd->self.root_hub);
- urb_unlink (urb);
-
- /* lower level hcd code should use *_dma exclusively if the
- * host controller does DMA */
- if (hcd->self.uses_dma && !at_root_hub) {
- if (usb_pipecontrol (urb->pipe)
- && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
- dma_unmap_single (hcd->self.controller, urb->setup_dma,
- sizeof (struct usb_ctrlrequest),
- DMA_TO_DEVICE);
- if (urb->transfer_buffer_length != 0
- && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
- dma_unmap_single (hcd->self.controller,
- urb->transfer_dma,
- urb->transfer_buffer_length,
- usb_pipein (urb->pipe)
- ? DMA_FROM_DEVICE
- : DMA_TO_DEVICE);
- }
-
+ urb_unlink(hcd, urb);
usbmon_urb_complete (&hcd->self, urb);
usb_unanchor_urb(urb);