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USB: Eliminate urb->status usage!

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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>
This commit is contained in:
Alan Stern 2007-08-24 15:42:24 -04:00 committed by Greg Kroah-Hartman
parent 9347d51c52
commit 4a00027dcb
11 changed files with 46 additions and 77 deletions
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22
drivers/usb/core/hcd.c
View file

@ -532,7 +532,6 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
/* 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 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
* 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 @@ void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
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 @@ static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
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 @@ int usb_hcd_unlink_urb (struct urb *urb, int status)
* 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 @@ int usb_hcd_unlink_urb (struct urb *urb, int status)
* 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))

3
drivers/usb/core/hcd.h
View file

@ -217,7 +217,8 @@ extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
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);

3
drivers/usb/gadget/dummy_hcd.c
View file

@ -1511,8 +1511,7 @@ static void dummy_timer (unsigned long _dum)
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;

3
drivers/usb/host/ehci-q.c
View file

@ -256,8 +256,7 @@ __acquires(ehci->lock)
/* 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);
}

15
drivers/usb/host/isp116x-hcd.c
View file

@ -277,7 +277,7 @@ static void preproc_atl_queue(struct isp116x *isp116x)
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 @@ __releases(isp116x->lock) __acquires(isp116x->lock)
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 @@ static void postproc_atl_queue(struct isp116x *isp116x)
}
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 @@ static int isp116x_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
}
if (urb)
finish_request(isp116x, ep, urb);
finish_request(isp116x, ep, urb, status);
done:
spin_unlock_irqrestore(&isp116x->lock, flags);
return rc;

3
drivers/usb/host/ohci-q.c
View file

@ -62,8 +62,7 @@ __acquires(ohci->lock)
/* 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 */

8
drivers/usb/host/r8a66597-hcd.c
View file

@ -782,12 +782,12 @@ static void force_dequeue(struct r8a66597 *r8a66597, u16 pipenum, u16 address)
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 @@ __releases(r8a66597->lock) __acquires(r8a66597->lock)
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);
}

3
drivers/usb/host/sl811-hcd.c
View file

@ -436,9 +436,8 @@ static void finish_request(
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 */

36
drivers/usb/host/u132-hcd.c
View file

@ -518,7 +518,6 @@ static void u132_hcd_giveback_urb(struct u132 *u132, struct u132_endp *endp,
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 @@ static void u132_hcd_giveback_urb(struct u132 *u132, struct u132_endp *endp,
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 @@ static void u132_hcd_abandon_urb(struct u132 *u132, struct u132_endp *endp,
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 @@ static void u132_hcd_abandon_urb(struct u132 *u132, struct u132_endp *endp,
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 @@ static void u132_hcd_interrupt_recv(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_bulk_output_sent(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_bulk_input_recv(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_configure_empty_sent(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_configure_input_recv(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_configure_empty_recv(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_configure_setup_sent(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_enumeration_empty_recv(void *data, struct urb *urb,
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 @@ static void u132_hcd_enumeration_address_sent(void *data, struct urb *urb,
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 @@ static void u132_hcd_initial_empty_sent(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_initial_input_recv(void *data, struct urb *urb, u8 *buf,
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 @@ static void u132_hcd_initial_setup_sent(void *data, struct urb *urb, u8 *buf,
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 @@ static int dequeue_from_overflow_chain(struct u132 *u132,
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 @@ static int u132_endp_urb_dequeue(struct u132 *u132, struct u132_endp *endp,
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 @@ static int u132_endp_urb_dequeue(struct u132 *u132, struct u132_endp *endp,
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 "

15
drivers/usb/host/uhci-hcd.h
View file

@ -456,21 +456,6 @@ struct urb_priv {
};
/*
* 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

12
drivers/usb/host/uhci-q.c
View file

@ -1480,7 +1480,7 @@ static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
* 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 @@ __acquires(uhci->lock)
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 @@ static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
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 @@ static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
return;
}
uhci_giveback_urb(uhci, qh, urb);
uhci_giveback_urb(uhci, qh, urb, status);
if (status < 0)
break;
}
@ -1594,7 +1590,7 @@ static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
qh->is_stopped = 0;
return;
}
uhci_giveback_urb(uhci, qh, urb);
uhci_giveback_urb(uhci, qh, urb, 0);
goto restart;
}
}