/* * Intel MIC Platform Software Stack (MPSS) * * Copyright(c) 2013 Intel Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * * Intel MIC Host driver. * */ #ifndef _MIC_IOCTL_H_ #define _MIC_IOCTL_H_ #include /* * mic_copy - MIC virtio descriptor copy. * * @iov: An array of IOVEC structures containing user space buffers. * @iovcnt: Number of IOVEC structures in iov. * @vr_idx: The vring index. * @update_used: A non zero value results in used index being updated. * @out_len: The aggregate of the total length written to or read from * the virtio device. */ struct mic_copy_desc { #ifdef __KERNEL__ struct iovec __user *iov; #else struct iovec *iov; #endif __u32 iovcnt; __u8 vr_idx; __u8 update_used; __u32 out_len; }; /* * Add a new virtio device * The (struct mic_device_desc *) pointer points to a device page entry * for the virtio device consisting of: * - struct mic_device_desc * - struct mic_vqconfig (num_vq of these) * - host and guest features * - virtio device config space * The total size referenced by the pointer should equal the size returned * by desc_size() in mic_common.h */ #define MIC_VIRTIO_ADD_DEVICE _IOWR('s', 1, struct mic_device_desc *) /* * Copy the number of entries in the iovec and update the used index * if requested by the user. */ #define MIC_VIRTIO_COPY_DESC _IOWR('s', 2, struct mic_copy_desc *) /* * Notify virtio device of a config change * The (__u8 *) pointer points to config space values for the device * as they should be written into the device page. The total size * referenced by the pointer should equal the config_len field of struct * mic_device_desc. */ #define MIC_VIRTIO_CONFIG_CHANGE _IOWR('s', 5, __u8 *) #endif ' name='id' value='add7c65ca426b7a37184dd3d2172394e23d585d6'/>
path: root/net/ipx/ipx_proc.c
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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 /net/ipx/ipx_proc.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 'net/ipx/ipx_proc.c')