#include #include #include #include #include #include #include static int xen_dbgp_op(struct usb_hcd *hcd, int op) { #ifdef CONFIG_PCI const struct device *ctrlr = hcd_to_bus(hcd)->controller; #endif struct physdev_dbgp_op dbgp; if (!xen_initial_domain()) return 0; dbgp.op = op; #ifdef CONFIG_PCI if (dev_is_pci(ctrlr)) { const struct pci_dev *pdev = to_pci_dev(ctrlr); dbgp.u.pci.seg = pci_domain_nr(pdev->bus); dbgp.u.pci.bus = pdev->bus->number; dbgp.u.pci.devfn = pdev->devfn; dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI; } else #endif dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN; return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp); } int xen_dbgp_reset_prep(struct usb_hcd *hcd) { return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE); } int xen_dbgp_external_startup(struct usb_hcd *hcd) { return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE); } #ifndef CONFIG_EARLY_PRINTK_DBGP #include EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep); EXPORT_SYMBOL_GPL(xen_dbgp_external_startup); #endif up net-next plumbingsTobias Klauser
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /tools/perf/builtin-annotate.c
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'tools/perf/builtin-annotate.c')