> -----Original Message----- > From: Rafael J. Wysocki [mailto:rjw@xxxxxxx] > Sent: Monday, December 27, 2010 6:07 AM > To: Xu, Andiry > Cc: Sarah Sharp; linux-kernel@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; > Greg Kroah-Hartman; Alan Stern; Linux-pm mailing list; Matthew Garrett > Subject: Re: Scary warnings from xhci_hcd on rmmod and during > shutdown/suspend/resume > > On Friday, December 17, 2010, Rafael J. Wysocki wrote: > > On Friday, December 17, 2010, Xu, Andiry wrote: > > > > > > > > and during shutdown (I believe the warnings are the same or > analogous > > > to > > > > the > > > > above). > > > > > > > > I tested with the attached patch from Andiry applied and I got the > > > > following > > > > BUG during resume: > > > > > > Does this bug occurs without the synchronize irq patch? > > > > Yes, it does. > > > > > Seems the rmmod, shutdown and resume bugs are caused by > xhci_cleanup_msix(). > > > > > > > > > > > [ 91.703778] sd 0:0:0:0: [sda] Starting disk > > > > [ 91.704054] sd 2:0:0:0: [sdb] Starting disk > > > > [ 91.703680] xhci_hcd 0000:04:00.0: Host controller not halted, > > > aborting > > > > reset. > > > > [ 91.703680] BUG: sleeping function called from invalid context at > > > > /home/rafael/src/linux-2.6/kernel/mutex.c:278 > > > > [ 91.703680] in_atomic(): 1, irqs_disabled(): 1, pid: 1234, name: > > > > kworker/u:6 > > > > [ 91.703680] INFO: lockdep is turned off. > > > > [ 91.703680] irq event stamp: 24060 > > > > [ 91.703680] hardirqs last enabled at (24059): > [<ffffffff810aa071>] > > > > rcu_note_context_switch+0xa1/0x1c0 > > > > [ 91.703680] hardirqs last disabled at (24060): > [<ffffffff81494e92>] > > > > _raw_spin_lock_irq+0x12/0x50 > > > > [ 91.703680] softirqs last enabled at (20026): > [<ffffffff8105056e>] > > > > __do_softirq+0x11e/0x160 > > > > [ 91.703680] softirqs last disabled at (20011): > [<ffffffff8100368c>] > > > > call_softirq+0x1c/0x30 > > > > [ 91.703680] Pid: 1234, comm: kworker/u:6 Tainted: G W > > > 2.6.37- > > > > rc6+ #12 > > > > [ 91.703680] Call Trace: > > > > [ 91.703680] [<ffffffff81079290>] ? > print_irqtrace_events+0xd0/0xe0 > > > > [ 91.703680] [<ffffffff81036783>] __might_sleep+0x103/0x130 > > > > [ 91.703680] [<ffffffff81492f73>] mutex_lock_nested+0x33/0x380 > > > > [ 91.703680] [<ffffffff81495727>] ? > > > > _raw_spin_unlock_irqrestore+0x67/0x70 > > > > [ 91.703680] [<ffffffff810a39de>] ? > dynamic_irq_cleanup+0xde/0x100 > > > > [ 91.703680] [<ffffffff810a3a58>] irq_free_descs+0x58/0x90 > > > > [ 91.703680] [<ffffffff81022008>] destroy_irq+0x78/0x90 > > > > [ 91.703680] [<ffffffff810222c9>] > native_teardown_msi_irq+0x9/0x10 > > > > [ 91.703680] [<ffffffff811ee0b0>] > > > default_teardown_msi_irqs+0x70/0xa0 > > > > [ 91.703680] [<ffffffff811edb41>] free_msi_irqs+0xa1/0x110 > > > > [ 91.703680] [<ffffffff811eec1d>] pci_disable_msix+0x3d/0x50 > > > > [ 91.703680] [<ffffffffa03f0609>] xhci_cleanup_msix+0x39/0x80 > > > [xhci_hcd] > > > > [ 91.703680] [<ffffffffa03f111c>] xhci_resume+0x1ac/0x250 > > > [xhci_hcd] > > > > [ 91.703680] [<ffffffffa03f65c4>] xhci_pci_resume+0x14/0x20 > > > [xhci_hcd] > > > > [ 91.703680] [<ffffffff8138996b>] resume_common+0xbb/0x140 > > > > [ 91.703680] [<ffffffff81389a5e>] hcd_pci_restore+0xe/0x10 > > > > [ 91.703680] [<ffffffff811e36f3>] pci_pm_restore+0x63/0xb0 > > > > [ 91.703680] [<ffffffff813334bd>] pm_op+0x19d/0x1c0 > > > > [ 91.703680] [<ffffffff81333be4>] device_resume+0x94/0x220 > > > > [ 91.703680] [<ffffffff81333d8c>] async_resume+0x1c/0x50 > > > > [ 91.703680] [<ffffffff8106e6e6>] async_run_entry_fn+0x86/0x160 > > > > [ 91.703680] [<ffffffff81060672>] process_one_work+0x1a2/0x450 > > > > [ 91.703680] [<ffffffff81060614>] ? process_one_work+0x144/0x450 > > > > [ 91.703680] [<ffffffff811d2704>] ? do_raw_spin_lock+0x104/0x170 > > > > [ 91.703680] [<ffffffff8106e660>] ? async_run_entry_fn+0x0/0x160 > > > > [ 91.703680] [<ffffffff81061e32>] worker_thread+0x162/0x340 > > > > [ 91.703680] [<ffffffff81061cd0>] ? worker_thread+0x0/0x340 > > > > [ 91.703680] [<ffffffff81066836>] kthread+0x96/0xa0 > > > > [ 91.703680] [<ffffffff81003594>] kernel_thread_helper+0x4/0x10 > > > > [ 91.703680] [<ffffffff81036fdb>] ? finish_task_switch+0x7b/0xe0 > > > > [ 91.703680] [<ffffffff81495d00>] ? restore_args+0x0/0x30 > > > > [ 91.703680] [<ffffffff810667a0>] ? kthread+0x0/0xa0 > > > > [ 91.703680] [<ffffffff81003590>] ? kernel_thread_helper+0x0/0x10 > > > > [ 91.706248] xhci_hcd 0000:04:00.0: irq 81 for MSI/MSI-X > > > > [ 91.706251] xhci_hcd 0000:04:00.0: irq 82 for MSI/MSI-X > > > > [ 91.706253] xhci_hcd 0000:04:00.0: irq 83 for MSI/MSI-X > > > > [ 91.706256] xhci_hcd 0000:04:00.0: irq 84 for MSI/MSI-X > > > > [ 91.706258] xhci_hcd 0000:04:00.0: irq 85 for MSI/MSI-X > > > > [ 91.706260] xhci_hcd 0000:04:00.0: irq 86 for MSI/MSI-X > > > > [ 91.706262] xhci_hcd 0000:04:00.0: irq 87 for MSI/MSI-X > > > > > > > > The issues appear to be 100% reproducible. > > > > > > > > > > I'm not able to reproduce the issue. Can you specify your kernel > version > > > and attach your .config? > > > > The kernel is basically 2.6.37-rc6, but I was able to reproduce this > with > > previous 2.6.37-rc too. > > > > Attached are the full dmesg containing the traces I sent before > and .config. > > OK, so the problem seems to be that xhci_cleanup_msix() cannot be called > under > a spinlock, because it causes a mutex to be acquired somewhere up the call > chain. > > Also, you don't really need to do this "drop MSI-X and acquire a 'normal' > IRQ > to fool the USB core" thing during suspend. > > The appended patch works on my test machine, where I mean that (a) the > reported > warnings don't appear and (b) it doesn't crash the system during resume > (from > hibernation). > Thanks for the patch. Actually I already have a patch in modification about synchronize_irq() in xhci_suspend() and I'll submit it later. The patch will fix your suspend/hibernation issue. Sarah will submit another patch, move the xhci_cleanup_msix() out of spinlock to fix the rmmod issue. They are actually two bugs so we use two patches. Thanks, Andiry > --- > drivers/usb/core/hcd-pci.c | 3 ++- > drivers/usb/host/xhci.c | 38 ++++++++------------------------------ > include/linux/usb/hcd.h | 1 + > 3 files changed, 11 insertions(+), 31 deletions(-) > > Index: linux-2.6/include/linux/usb/hcd.h > =================================================================== > --- linux-2.6.orig/include/linux/usb/hcd.h > +++ linux-2.6/include/linux/usb/hcd.h > @@ -119,6 +119,7 @@ struct usb_hcd { > unsigned wireless:1; /* Wireless USB HCD */ > unsigned authorized_default:1; > unsigned has_tt:1; /* Integrated TT in root hub */ > + unsigned multiple_irqs:1; /* Multiple IRQs used */ > > int irq; /* irq allocated */ > void __iomem *regs; /* device memory/io */ > Index: linux-2.6/drivers/usb/core/hcd-pci.c > =================================================================== > --- linux-2.6.orig/drivers/usb/core/hcd-pci.c > +++ linux-2.6/drivers/usb/core/hcd-pci.c > @@ -406,7 +406,8 @@ static int suspend_common(struct device > return retval; > } > > - synchronize_irq(pci_dev->irq); > + if (!hcd->multiple_irqs) > + synchronize_irq(pci_dev->irq); > > /* Downstream ports from this root hub should already be quiesced, > so > * there will be no DMA activity. Now we can shut down the upstream > Index: linux-2.6/drivers/usb/host/xhci.c > =================================================================== > --- linux-2.6.orig/drivers/usb/host/xhci.c > +++ linux-2.6/drivers/usb/host/xhci.c > @@ -263,6 +263,8 @@ static int xhci_setup_msix(struct xhci_h > 0, "xhci_hcd", xhci_to_hcd(xhci)); > if (ret) > goto disable_msix; > + else > + xhci_to_hcd(xhci)->multiple_irqs = true; > } > > return ret; > @@ -508,9 +510,10 @@ void xhci_stop(struct usb_hcd *hcd) > spin_lock_irq(&xhci->lock); > xhci_halt(xhci); > xhci_reset(xhci); > - xhci_cleanup_msix(xhci); > spin_unlock_irq(&xhci->lock); > > + xhci_cleanup_msix(xhci); > + > #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING > /* Tell the event ring poll function not to reschedule */ > xhci->zombie = 1; > @@ -544,9 +547,10 @@ void xhci_shutdown(struct usb_hcd *hcd) > > spin_lock_irq(&xhci->lock); > xhci_halt(xhci); > - xhci_cleanup_msix(xhci); > spin_unlock_irq(&xhci->lock); > > + xhci_cleanup_msix(xhci); > + > xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n", > xhci_readl(xhci, &xhci->op_regs->status)); > } > @@ -677,8 +681,6 @@ int xhci_suspend(struct xhci_hcd *xhci) > spin_unlock_irq(&xhci->lock); > return -ETIMEDOUT; > } > - /* step 5: remove core well power */ > - xhci_cleanup_msix(xhci); > spin_unlock_irq(&xhci->lock); > > return rc; > @@ -694,7 +696,6 @@ int xhci_resume(struct xhci_hcd *xhci, b > { > u32 command, temp = 0; > struct usb_hcd *hcd = xhci_to_hcd(xhci); > - struct pci_dev *pdev = to_pci_dev(hcd->self.controller); > int old_state, retval; > > old_state = hcd->state; > @@ -729,9 +730,10 @@ int xhci_resume(struct xhci_hcd *xhci, b > xhci_dbg(xhci, "Stop HCD\n"); > xhci_halt(xhci); > xhci_reset(xhci); > + spin_unlock_irq(&xhci->lock); > + > if (hibernated) > xhci_cleanup_msix(xhci); > - spin_unlock_irq(&xhci->lock); > > #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING > /* Tell the event ring poll function not to reschedule */ > @@ -765,30 +767,6 @@ int xhci_resume(struct xhci_hcd *xhci, b > return retval; > } > > - spin_unlock_irq(&xhci->lock); > - /* Re-setup MSI-X */ > - if (hcd->irq) > - free_irq(hcd->irq, hcd); > - hcd->irq = -1; > - > - retval = xhci_setup_msix(xhci); > - if (retval) > - /* fall back to msi*/ > - retval = xhci_setup_msi(xhci); > - > - if (retval) { > - /* fall back to legacy interrupt*/ > - retval = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, > - hcd->irq_descr, hcd); > - if (retval) { > - xhci_err(xhci, "request interrupt %d failed\n", > - pdev->irq); > - return retval; > - } > - hcd->irq = pdev->irq; > - } > - > - spin_lock_irq(&xhci->lock); > /* step 4: set Run/Stop bit */ > command = xhci_readl(xhci, &xhci->op_regs->command); > command |= CMD_RUN; -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
