From: Alan Stern Date: Mon, 5 Jun 2006 16:21:30 +0000 (-0400) Subject: [PATCH] UHCI: remove hc_inaccessible flag X-Git-Tag: v2.6.18-rc1~858^2~35 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e323de46e83b6df2f330651907ac823f8d53308a;p=linux-2.6 [PATCH] UHCI: remove hc_inaccessible flag This patch (as706) removes the private hc_inaccessible flag from uhci-hcd. It's not needed because it conveys exactly the same information as the generic HCD_FLAG_HW_ACCESSIBLE bit. In its place goes a new flag recording whether the controller is dead. The new code allows a complete device reset to resurrect a dead controller (although usbcore doesn't yet implement such a facility). Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index dc9ed29c61..025b969f95 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -110,17 +110,23 @@ static void finish_reset(struct uhci_hcd *uhci) uhci->is_stopped = UHCI_IS_STOPPED; uhci_to_hcd(uhci)->state = HC_STATE_HALT; uhci_to_hcd(uhci)->poll_rh = 0; + + uhci->dead = 0; /* Full reset resurrects the controller */ } /* * Last rites for a defunct/nonfunctional controller * or one we don't want to use any more. */ -static void hc_died(struct uhci_hcd *uhci) +static void uhci_hc_died(struct uhci_hcd *uhci) { + uhci_get_current_frame_number(uhci); uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr); finish_reset(uhci); - uhci->hc_inaccessible = 1; + uhci->dead = 1; + + /* The current frame may already be partway finished */ + ++uhci->frame_number; } /* @@ -234,7 +240,7 @@ __acquires(uhci->lock) spin_unlock_irq(&uhci->lock); msleep(1); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Died */ + if (uhci->dead) return; } if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) @@ -287,7 +293,7 @@ __acquires(uhci->lock) spin_unlock_irq(&uhci->lock); msleep(20); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Died */ + if (uhci->dead) return; /* End Global Resume and wait for EOP to be sent */ @@ -339,7 +345,7 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs) errbuf, ERRBUF_LEN); lprintk(errbuf); } - hc_died(uhci); + uhci_hc_died(uhci); /* Force a callback in case there are * pending unlinks */ @@ -462,7 +468,7 @@ static void uhci_shutdown(struct pci_dev *pdev) { struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev); - hc_died(hcd_to_uhci(hcd)); + uhci_hc_died(hcd_to_uhci(hcd)); } /* @@ -664,8 +670,8 @@ 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) - hc_died(uhci); + if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead) + uhci_hc_died(uhci); uhci_scan_schedule(uhci, NULL); spin_unlock_irq(&uhci->lock); @@ -681,7 +687,7 @@ static int uhci_rh_suspend(struct usb_hcd *hcd) spin_lock_irq(&uhci->lock); if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) rc = -ESHUTDOWN; - else if (!uhci->hc_inaccessible) + else if (!uhci->dead) suspend_rh(uhci, UHCI_RH_SUSPENDED); spin_unlock_irq(&uhci->lock); return rc; @@ -696,7 +702,7 @@ static int uhci_rh_resume(struct usb_hcd *hcd) if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { dev_warn(&hcd->self.root_hub->dev, "HC isn't running!\n"); rc = -ESHUTDOWN; - } else if (!uhci->hc_inaccessible) + } else if (!uhci->dead) wakeup_rh(uhci); spin_unlock_irq(&uhci->lock); return rc; @@ -710,8 +716,8 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message) dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Dead or already suspended */ - goto done; + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead) + goto done_okay; /* Already suspended or dead */ if (uhci->rh_state > UHCI_RH_SUSPENDED) { dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n"); @@ -724,12 +730,12 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message) */ pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0); mb(); - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - uhci->hc_inaccessible = 1; hcd->poll_rh = 0; /* FIXME: Enable non-PME# remote wakeup? */ +done_okay: + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); done: spin_unlock_irq(&uhci->lock); return rc; @@ -742,25 +748,22 @@ static int uhci_resume(struct usb_hcd *hcd) dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__); /* Since we aren't in D3 any more, it's safe to set this flag - * even if the controller was dead. It might not even be dead - * any more, if the firmware or quirks code has reset it. + * even if the controller was dead. */ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); mb(); - if (uhci->rh_state == UHCI_RH_RESET) /* Dead */ - return 0; - spin_lock_irq(&uhci->lock); /* FIXME: Disable non-PME# remote wakeup? */ - uhci->hc_inaccessible = 0; - - /* The BIOS may have changed the controller settings during a - * system wakeup. Check it and reconfigure to avoid problems. + /* The firmware or a boot kernel may have changed the controller + * settings during a system wakeup. Check it and reconfigure + * to avoid problems. */ check_and_reset_hc(uhci); + + /* If the controller was dead before, it's back alive now */ configure_hc(uhci); if (uhci->rh_state == UHCI_RH_RESET) { diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h index 469b4268b8..619d704f4e 100644 --- a/drivers/usb/host/uhci-hcd.h +++ b/drivers/usb/host/uhci-hcd.h @@ -395,7 +395,7 @@ 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 dead:1; /* Controller has died */ unsigned int working_RD:1; /* Suspended root hub doesn't need to be polled */ unsigned int is_initialized:1; /* Data structure is usable */ diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c index f53c116e0d..c545ef92fe 100644 --- a/drivers/usb/host/uhci-hub.c +++ b/drivers/usb/host/uhci-hub.c @@ -171,7 +171,7 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf) spin_lock_irqsave(&uhci->lock, flags); uhci_scan_schedule(uhci, NULL); - if (uhci->hc_inaccessible) + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead) goto done; uhci_check_ports(uhci); @@ -227,7 +227,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wPortChange, wPortStatus; unsigned long flags; - if (uhci->hc_inaccessible) + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead) return -ETIMEDOUT; spin_lock_irqsave(&uhci->lock, flags);