diff options
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index e8ba4c44223a..81cda09b47e3 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -71,7 +71,6 @@ static const char hcd_name [] = "ehci_hcd"; -#undef VERBOSE_DEBUG #undef EHCI_URB_TRACE /* magic numbers that can affect system performance */ @@ -686,8 +685,15 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) struct ehci_hcd *ehci = hcd_to_ehci (hcd); u32 status, masked_status, pcd_status = 0, cmd; int bh; + unsigned long flags; - spin_lock (&ehci->lock); + /* + * For threadirqs option we use spin_lock_irqsave() variant to prevent + * deadlock with ehci hrtimer callback, because hrtimer callbacks run + * in interrupt context even when threadirqs is specified. We can go + * back to spin_lock() variant when hrtimer callbacks become threaded. + */ + spin_lock_irqsave(&ehci->lock, flags); status = ehci_readl(ehci, &ehci->regs->status); @@ -705,7 +711,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* Shared IRQ? */ if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) { - spin_unlock(&ehci->lock); + spin_unlock_irqrestore(&ehci->lock, flags); return IRQ_NONE; } @@ -714,13 +720,6 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) cmd = ehci_readl(ehci, &ehci->regs->command); bh = 0; -#ifdef VERBOSE_DEBUG - /* unrequested/ignored: Frame List Rollover */ - dbg_status (ehci, "irq", status); -#endif - - /* INT, ERR, and IAA interrupt rates can be throttled */ - /* normal [4.15.1.2] or error [4.15.1.1] completion */ if (likely ((status & (STS_INT|STS_ERR)) != 0)) { if (likely ((status & STS_ERR) == 0)) @@ -823,7 +822,7 @@ dead: if (bh) ehci_work (ehci); - spin_unlock (&ehci->lock); + spin_unlock_irqrestore(&ehci->lock, flags); if (pcd_status) usb_hcd_poll_rh_status(hcd); return IRQ_HANDLED; @@ -1320,7 +1319,7 @@ static int __init ehci_hcd_init(void) sizeof(struct ehci_qh), sizeof(struct ehci_qtd), sizeof(struct ehci_itd), sizeof(struct ehci_sitd)); -#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) +#ifdef CONFIG_DYNAMIC_DEBUG ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root); if (!ehci_debug_root) { retval = -ENOENT; @@ -1369,7 +1368,7 @@ clean2: platform_driver_unregister(&PLATFORM_DRIVER); clean0: #endif -#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) +#ifdef CONFIG_DYNAMIC_DEBUG debugfs_remove(ehci_debug_root); ehci_debug_root = NULL; err_debug: @@ -1393,7 +1392,7 @@ static void __exit ehci_hcd_cleanup(void) #ifdef PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); #endif -#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) +#ifdef CONFIG_DYNAMIC_DEBUG debugfs_remove(ehci_debug_root); #endif clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); |