USB: Eliminate urb->status usage!
This patch (as979) removes the last vestiges of urb->status from the
host controller drivers and the root-hub emulator. Now the field
doesn't get set until just before the URB's completion routine is
called.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>
CC: Olav Kongas <ok@artecdesign.ee>
CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
CC: Tony Olech <tony.olech@elandigitalsystems.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 4ac021e..1c5e5d3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -532,7 +532,6 @@
/* any errors get returned through the urb completion */
spin_lock_irq(&hcd_root_hub_lock);
- urb->status = status;
usb_hcd_unlink_urb_from_ep(hcd, urb);
/* This peculiar use of spinlocks echoes what real HC drivers do.
@@ -540,7 +539,7 @@
* RT-friendly.
*/
spin_unlock(&hcd_root_hub_lock);
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
spin_lock(&hcd_root_hub_lock);
spin_unlock_irq(&hcd_root_hub_lock);
@@ -578,13 +577,12 @@
if (urb) {
hcd->poll_pending = 0;
hcd->status_urb = NULL;
- urb->status = 0;
urb->actual_length = length;
memcpy(urb->transfer_buffer, buffer, length);
usb_hcd_unlink_urb_from_ep(hcd, urb);
spin_unlock(&hcd_root_hub_lock);
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, 0);
spin_lock(&hcd_root_hub_lock);
} else {
length = 0;
@@ -677,7 +675,7 @@
usb_hcd_unlink_urb_from_ep(hcd, urb);
spin_unlock(&hcd_root_hub_lock);
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
spin_lock(&hcd_root_hub_lock);
}
}
@@ -1252,6 +1250,7 @@
* usb_hcd_giveback_urb - return URB from HCD to device driver
* @hcd: host controller returning the URB
* @urb: urb being returned to the USB device driver.
+ * @status: completion status code for the URB.
* Context: in_interrupt()
*
* This hands the URB from HCD to its USB device driver, using its
@@ -1260,25 +1259,26 @@
* the device driver won't cause problems if it frees, modifies,
* or resubmits this URB.
*
- * If @urb was unlinked, the value of @urb->status will be overridden by
+ * If @urb was unlinked, the value of @status will be overridden by
* @urb->unlinked. Erroneous short transfers are detected in case
* the HCD hasn't checked for them.
*/
-void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb)
+void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
{
urb->hcpriv = NULL;
if (unlikely(urb->unlinked))
- urb->status = urb->unlinked;
+ status = urb->unlinked;
else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
urb->actual_length < urb->transfer_buffer_length &&
- !urb->status))
- urb->status = -EREMOTEIO;
+ !status))
+ status = -EREMOTEIO;
unmap_urb_for_dma(hcd, urb);
- usbmon_urb_complete(&hcd->self, urb, urb->status);
+ usbmon_urb_complete(&hcd->self, urb, status);
usb_unanchor_urb(urb);
/* pass ownership to the completion handler */
+ urb->status = status;
urb->complete (urb);
atomic_dec (&urb->use_count);
if (unlikely (urb->reject))
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 729b7a0..0fc7b95 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -217,7 +217,8 @@
extern int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags);
extern int usb_hcd_unlink_urb (struct urb *urb, int status);
-extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb);
+extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
+ int status);
extern void usb_hcd_endpoint_disable (struct usb_device *udev,
struct usb_host_endpoint *ep);
extern int usb_hcd_get_frame_number (struct usb_device *udev);
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index c1af7ba..58e4d72 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -1511,8 +1511,7 @@
usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
spin_unlock (&dum->lock);
- urb->status = status;
- usb_hcd_giveback_urb (dummy_to_hcd(dum), urb);
+ usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
spin_lock (&dum->lock);
goto restart;
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 794d27e..b10f39c 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -256,8 +256,7 @@
/* complete() can reenter this HCD */
usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
spin_unlock (&ehci->lock);
- urb->status = status;
- usb_hcd_giveback_urb (ehci_to_hcd(ehci), urb);
+ usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status);
spin_lock (&ehci->lock);
}
diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index 35b3507..c27417f 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/drivers/usb/host/isp116x-hcd.c
@@ -277,7 +277,7 @@
processed urbs.
*/
static void finish_request(struct isp116x *isp116x, struct isp116x_ep *ep,
- struct urb *urb)
+ struct urb *urb, int status)
__releases(isp116x->lock) __acquires(isp116x->lock)
{
unsigned i;
@@ -291,7 +291,7 @@
usb_hcd_unlink_urb_from_ep(isp116x_to_hcd(isp116x), urb);
spin_unlock(&isp116x->lock);
- usb_hcd_giveback_urb(isp116x_to_hcd(isp116x), urb);
+ usb_hcd_giveback_urb(isp116x_to_hcd(isp116x), urb, status);
spin_lock(&isp116x->lock);
/* take idle endpoints out of the schedule */
@@ -453,13 +453,8 @@
}
done:
- if (status != -EINPROGRESS) {
- spin_lock(&urb->lock);
- urb->status = status;
- spin_unlock(&urb->lock);
- }
- if (urb->status != -EINPROGRESS || urb->unlinked)
- finish_request(isp116x, ep, urb);
+ if (status != -EINPROGRESS || urb->unlinked)
+ finish_request(isp116x, ep, urb, status);
}
}
@@ -853,7 +848,7 @@
}
if (urb)
- finish_request(isp116x, ep, urb);
+ finish_request(isp116x, ep, urb, status);
done:
spin_unlock_irqrestore(&isp116x->lock, flags);
return rc;
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 13d31ed..5181732 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -62,8 +62,7 @@
/* urb->complete() can reenter this HCD */
usb_hcd_unlink_urb_from_ep(ohci_to_hcd(ohci), urb);
spin_unlock (&ohci->lock);
- urb->status = status;
- usb_hcd_giveback_urb (ohci_to_hcd(ohci), urb);
+ usb_hcd_giveback_urb(ohci_to_hcd(ohci), urb, status);
spin_lock (&ohci->lock);
/* stop periodic dma if it's not needed */
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index fea6036..fd00f1e 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -782,12 +782,12 @@
kfree(td);
if (urb) {
- urb->status = -ENODEV;
usb_hcd_unlink_urb_from_ep(r8a66597_to_hcd(r8a66597),
urb);
spin_unlock(&r8a66597->lock);
- usb_hcd_giveback_urb(r8a66597_to_hcd(r8a66597), urb);
+ usb_hcd_giveback_urb(r8a66597_to_hcd(r8a66597), urb,
+ -ENODEV);
spin_lock(&r8a66597->lock);
}
break;
@@ -1134,10 +1134,8 @@
urb->start_frame = r8a66597_get_frame(hcd);
usb_hcd_unlink_urb_from_ep(r8a66597_to_hcd(r8a66597), urb);
-
- urb->status = status;
spin_unlock(&r8a66597->lock);
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
spin_lock(&r8a66597->lock);
}
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index 5151528..94d859a 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -436,9 +436,8 @@
ep->nextpid = USB_PID_SETUP;
usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
- urb->status = status;
spin_unlock(&sl811->lock);
- usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb);
+ usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
spin_lock(&sl811->lock);
/* leave active endpoints in the schedule */
diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
index db800a4..2b379a7 100644
--- a/drivers/usb/host/u132-hcd.c
+++ b/drivers/usb/host/u132-hcd.c
@@ -518,7 +518,6 @@
unsigned long irqs;
struct usb_hcd *hcd = u132_to_hcd(u132);
urb->error_count = 0;
- urb->status = status;
spin_lock_irqsave(&endp->queue_lock.slock, irqs);
usb_hcd_unlink_urb_from_ep(hcd, urb);
endp->queue_next += 1;
@@ -542,7 +541,7 @@
u132_ring_queue_work(u132, ring, 0);
up(&u132->scheduler_lock);
u132_endp_put_kref(u132, endp);
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
return;
}
@@ -558,7 +557,6 @@
unsigned long irqs;
struct usb_hcd *hcd = u132_to_hcd(u132);
urb->error_count = 0;
- urb->status = status;
spin_lock_irqsave(&endp->queue_lock.slock, irqs);
usb_hcd_unlink_urb_from_ep(hcd, urb);
endp->queue_next += 1;
@@ -575,7 +573,7 @@
endp->active = 0;
spin_unlock_irqrestore(&endp->queue_lock.slock, irqs);
kfree(urbq);
- } usb_hcd_giveback_urb(hcd, urb);
+ } usb_hcd_giveback_urb(hcd, urb, status);
return;
}
@@ -719,7 +717,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -771,7 +769,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -874,7 +872,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -911,7 +909,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -983,7 +981,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1020,7 +1018,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1080,7 +1078,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1121,7 +1119,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1165,7 +1163,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1202,7 +1200,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1254,7 +1252,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -1299,7 +1297,7 @@
dev_err(&u132->platform_dev->dev, "CALLBACK called urb=%p "
"unlinked=%d\n", urb, urb->unlinked);
up(&u132->scheduler_lock);
- u132_hcd_giveback_urb(u132, endp, urb, urb->status);
+ u132_hcd_giveback_urb(u132, endp, urb, 0);
return;
}
}
@@ -2428,7 +2426,7 @@
list_del(scan);
endp->queue_size -= 1;
urb->error_count = 0;
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, 0);
return 0;
} else
continue;
@@ -2472,7 +2470,7 @@
return 0;
} else {
spin_unlock_irqrestore(&endp->queue_lock.slock, irqs);
- u132_hcd_abandon_urb(u132, endp, urb, urb->status);
+ u132_hcd_abandon_urb(u132, endp, urb, status);
return 0;
}
} else {
@@ -2513,7 +2511,7 @@
irqs);
kfree(urbq);
} urb->error_count = 0;
- usb_hcd_giveback_urb(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
return 0;
} else if (list_empty(&endp->urb_more)) {
dev_err(&u132->platform_dev->dev, "urb=%p not found in "
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index e46d2b0..340d6ed 100644
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -456,21 +456,6 @@
};
-/*
- * Locking in uhci.c
- *
- * Almost everything relating to the hardware schedule and processing
- * of URBs is protected by uhci->lock. urb->status is protected by
- * urb->lock; that's the one exception.
- *
- * To prevent deadlocks, never lock uhci->lock while holding urb->lock.
- * The safe order of locking is:
- *
- * #1 uhci->lock
- * #2 urb->lock
- */
-
-
/* Some special IDs */
#define PCI_VENDOR_ID_GENESYS 0x17a0
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index bab5672..e5d60d5 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -1480,7 +1480,7 @@
* Finish unlinking an URB and give it back
*/
static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
- struct urb *urb)
+ struct urb *urb, int status)
__releases(uhci->lock)
__acquires(uhci->lock)
{
@@ -1520,7 +1520,7 @@
usb_hcd_unlink_urb_from_ep(uhci_to_hcd(uhci), urb);
spin_unlock(&uhci->lock);
- usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb);
+ usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, status);
spin_lock(&uhci->lock);
/* If the queue is now empty, we can unlink the QH and give up its
@@ -1556,10 +1556,6 @@
if (status == -EINPROGRESS)
break;
- spin_lock(&urb->lock);
- urb->status = status;
- spin_unlock(&urb->lock);
-
/* Dequeued but completed URBs can't be given back unless
* the QH is stopped or has finished unlinking. */
if (urb->unlinked) {
@@ -1569,7 +1565,7 @@
return;
}
- uhci_giveback_urb(uhci, qh, urb);
+ uhci_giveback_urb(uhci, qh, urb, status);
if (status < 0)
break;
}
@@ -1594,7 +1590,7 @@
qh->is_stopped = 0;
return;
}
- uhci_giveback_urb(uhci, qh, urb);
+ uhci_giveback_urb(uhci, qh, urb, 0);
goto restart;
}
}