Commit 1f09df8b authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman

[PATCH] USB UHCI: remove the FSBR kernel timer

This patch (as558) removes from the UHCI driver a kernel timer used for
checking Full Speed Bandwidth Reclamation (FSBR).  The checking can be
done during normal root-hub polling; it doesn't need a separate timer.
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent f1a15606
......@@ -97,14 +97,9 @@ static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
/* to make sure it doesn't hog all of the bandwidth */
#define DEPTH_INTERVAL 5
static inline void restart_timer(struct uhci_hcd *uhci)
{
mod_timer(&uhci->stall_timer, jiffies + msecs_to_jiffies(100));
}
#include "uhci-hub.c"
#include "uhci-debug.c"
#include "uhci-q.c"
#include "uhci-hub.c"
/*
* Make sure the controller is completely inactive, unable to
......@@ -160,7 +155,6 @@ static void hc_died(struct uhci_hcd *uhci)
{
reset_hc(uhci);
uhci->hc_inaccessible = 1;
del_timer(&uhci->stall_timer);
}
/*
......@@ -287,8 +281,11 @@ __acquires(uhci->lock)
/* Enable resume-detect interrupts if they work.
* Then enter Global Suspend mode, still configured.
*/
int_enable = (resume_detect_interrupts_are_broken(uhci) ?
0 : USBINTR_RESUME);
uhci->working_RD = 1;
int_enable = USBINTR_RESUME;
if (resume_detect_interrupts_are_broken(uhci)) {
uhci->working_RD = int_enable = 0;
}
outw(int_enable, uhci->io_addr + USBINTR);
outw(USBCMD_EGSM | USBCMD_CF, uhci->io_addr + USBCMD);
mb();
......@@ -315,7 +312,6 @@ __acquires(uhci->lock)
uhci->rh_state = new_state;
uhci->is_stopped = UHCI_IS_STOPPED;
del_timer(&uhci->stall_timer);
uhci_to_hcd(uhci)->poll_rh = !int_enable;
uhci_scan_schedule(uhci, NULL);
......@@ -335,7 +331,6 @@ static void start_rh(struct uhci_hcd *uhci)
mb();
uhci->rh_state = UHCI_RH_RUNNING;
uhci_to_hcd(uhci)->poll_rh = 1;
restart_timer(uhci);
}
static void wakeup_rh(struct uhci_hcd *uhci)
......@@ -374,20 +369,6 @@ __acquires(uhci->lock)
mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
}
static void stall_callback(unsigned long _uhci)
{
struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci;
unsigned long flags;
spin_lock_irqsave(&uhci->lock, flags);
uhci_scan_schedule(uhci, NULL);
check_fsbr(uhci);
if (!uhci->is_stopped)
restart_timer(uhci);
spin_unlock_irqrestore(&uhci->lock, flags);
}
static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
......@@ -418,8 +399,10 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
"host controller halted, "
"very bad!\n");
hc_died(uhci);
spin_unlock_irqrestore(&uhci->lock, flags);
return IRQ_HANDLED;
/* Force a callback in case there are
* pending unlinks */
mod_timer(&hcd->rh_timer, jiffies);
}
spin_unlock_irqrestore(&uhci->lock, flags);
}
......@@ -427,10 +410,11 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
if (status & USBSTS_RD)
usb_hcd_poll_rh_status(hcd);
else {
spin_lock_irqsave(&uhci->lock, flags);
uhci_scan_schedule(uhci, regs);
spin_unlock_irqrestore(&uhci->lock, flags);
}
return IRQ_HANDLED;
}
......@@ -595,10 +579,6 @@ static int uhci_start(struct usb_hcd *hcd)
init_waitqueue_head(&uhci->waitqh);
init_timer(&uhci->stall_timer);
uhci->stall_timer.function = stall_callback;
uhci->stall_timer.data = (unsigned long) uhci;
uhci->fl = dma_alloc_coherent(uhci_dev(uhci), sizeof(*uhci->fl),
&dma_handle, 0);
if (!uhci->fl) {
......@@ -745,11 +725,11 @@ static void uhci_stop(struct usb_hcd *hcd)
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
spin_lock_irq(&uhci->lock);
if (!uhci->hc_inaccessible)
reset_hc(uhci);
uhci_scan_schedule(uhci, NULL);
spin_unlock_irq(&uhci->lock);
del_timer_sync(&uhci->stall_timer);
release_uhci(uhci);
}
......@@ -811,13 +791,12 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
*/
pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
uhci->hc_inaccessible = 1;
hcd->poll_rh = 0;
/* FIXME: Enable non-PME# remote wakeup? */
done:
spin_unlock_irq(&uhci->lock);
if (rc == 0)
del_timer_sync(&hcd->rh_timer);
return rc;
}
......@@ -850,8 +829,11 @@ static int uhci_resume(struct usb_hcd *hcd)
spin_unlock_irq(&uhci->lock);
if (hcd->poll_rh)
if (!uhci->working_RD) {
/* Suspended root hub needs to be polled */
hcd->poll_rh = 1;
usb_hcd_poll_rh_status(hcd);
}
return 0;
}
#endif
......
......@@ -345,9 +345,6 @@ enum uhci_rh_state {
/*
* This describes the full uhci information.
*
* Note how the "proper" USB information is just
* a subset of what the full implementation needs.
*/
struct uhci_hcd {
......@@ -360,8 +357,6 @@ struct uhci_hcd {
struct dma_pool *qh_pool;
struct dma_pool *td_pool;
struct usb_bus *bus;
struct uhci_td *term_td; /* Terminating TD, see UHCI bug */
struct uhci_qh *skelqh[UHCI_NUM_SKELQH]; /* Skeleton QH's */
......@@ -380,6 +375,8 @@ struct uhci_hcd {
unsigned int scan_in_progress:1; /* Schedule scan is running */
unsigned int need_rescan:1; /* Redo the schedule scan */
unsigned int hc_inaccessible:1; /* HC is suspended or dead */
unsigned int working_RD:1; /* Suspended root hub doesn't
need to be polled */
/* Support for port suspend/resume/reset */
unsigned long port_c_suspend; /* Bit-arrays of ports */
......@@ -405,9 +402,7 @@ struct uhci_hcd {
/* List of URB's awaiting completion callback */
struct list_head complete_list; /* P: uhci->lock */
int rh_numports;
struct timer_list stall_timer;
int rh_numports; /* Number of root-hub ports */
wait_queue_head_t waitqh; /* endpoint_disable waiters */
};
......
......@@ -145,15 +145,16 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
unsigned long flags;
int status;
int status = 0;
spin_lock_irqsave(&uhci->lock, flags);
if (uhci->hc_inaccessible) {
status = 0;
goto done;
}
uhci_scan_schedule(uhci, NULL);
if (uhci->hc_inaccessible)
goto done;
check_fsbr(uhci);
uhci_check_ports(uhci);
status = get_hub_status_data(uhci, buf);
switch (uhci->rh_state) {
......
......@@ -33,7 +33,7 @@ static void uhci_free_pending_tds(struct uhci_hcd *uhci);
static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
{
if (uhci->is_stopped)
mod_timer(&uhci->stall_timer, jiffies);
mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
}
......
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