/* * Driver for USB Mass Storage devices * Usual Tables File for usb-storage and libusual * * Copyright (C) 2009 Alan Stern (stern@rowland.harvard.edu) * * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more * information about this driver. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * 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. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include /* * The table of devices */ #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ vendorName, productName, useProtocol, useTransport, \ initFunction, flags) \ { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ .driver_info = (flags) } #define COMPLIANT_DEV UNUSUAL_DEV #define USUAL_DEV(useProto, useTrans) \ { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans) } /* Define the device is matched with Vendor ID and interface descriptors */ #define UNUSUAL_VENDOR_INTF(id_vendor, cl, sc, pr, \ vendorName, productName, useProtocol, useTransport, \ initFunction, flags) \ { \ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ | USB_DEVICE_ID_MATCH_VENDOR, \ .idVendor = (id_vendor), \ .bInterfaceClass = (cl), \ .bInterfaceSubClass = (sc), \ .bInterfaceProtocol = (pr), \ .driver_info = (flags) \ } struct usb_device_id usb_storage_usb_ids[] = { # include "unusual_devs.h" { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, usb_storage_usb_ids); #undef UNUSUAL_DEV #undef COMPLIANT_DEV #undef USUAL_DEV #undef UNUSUAL_VENDOR_INTF /* * The table of devices to ignore */ struct ignore_entry { u16 vid, pid, bcdmin, bcdmax; }; #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ vendorName, productName, useProtocol, useTransport, \ initFunction, flags) \ { \ .vid = id_vendor, \ .pid = id_product, \ .bcdmin = bcdDeviceMin, \ .bcdmax = bcdDeviceMax, \ } static struct ignore_entry ignore_ids[] = { # include "unusual_alauda.h" # include "unusual_cypress.h" # include "unusual_datafab.h" # include "unusual_ene_ub6250.h" # include "unusual_freecom.h" # include "unusual_isd200.h" # include "unusual_jumpshot.h" # include "unusual_karma.h" # include "unusual_onetouch.h" # include "unusual_realtek.h" # include "unusual_sddr09.h" # include "unusual_sddr55.h" # include "unusual_usbat.h" { } /* Terminating entry */ }; #undef UNUSUAL_DEV /* Return an error if a device is in the ignore_ids list */ int usb_usual_ignore_device(struct usb_interface *intf) { struct usb_device *udev; unsigned vid, pid, bcd; struct ignore_entry *p; udev = interface_to_usbdev(intf); vid = le16_to_cpu(udev->descriptor.idVendor); pid = le16_to_cpu(udev->descriptor.idProduct); bcd = le16_to_cpu(udev->descriptor.bcdDevice); for (p = ignore_ids; p->vid; ++p) { if (p->vid == vid && p->pid == pid && p->bcdmin <= bcd && p->bcdmax >= bcd) return -ENXIO; } return 0; } ec09e0144dc3341'>bin/compaction-times-report
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /tools/perf/scripts/python/bin/compaction-times-report
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'tools/perf/scripts/python/bin/compaction-times-report')