#!/bin/bash # 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 User Space Tools. # # micctrl - Controls MIC boot/start/stop. # # chkconfig: 2345 95 05 # description: start MPSS stack processing. # ### BEGIN INIT INFO # Provides: micctrl ### END INIT INFO # Source function library. . /etc/init.d/functions sysfs="/sys/class/mic" _status() { f=$sysfs/$1 echo -e $1 state: "`cat $f/state`" shutdown_status: "`cat $f/shutdown_status`" } status() { if [ "`echo $1 | head -c3`" == "mic" ]; then _status $1 return $? fi for f in $sysfs/* do _status `basename $f` RETVAL=$? [ $RETVAL -ne 0 ] && return $RETVAL done return 0 } _reset() { f=$sysfs/$1 echo reset > $f/state } reset() { if [ "`echo $1 | head -c3`" == "mic" ]; then _reset $1 return $? fi for f in $sysfs/* do _reset `basename $f` RETVAL=$? [ $RETVAL -ne 0 ] && return $RETVAL done return 0 } _boot() { f=$sysfs/$1 echo "linux" > $f/bootmode echo "mic/uos.img" > $f/firmware echo "mic/$1.image" > $f/ramdisk echo "boot" > $f/state } boot() { if [ "`echo $1 | head -c3`" == "mic" ]; then _boot $1 return $? fi for f in $sysfs/* do _boot `basename $f` RETVAL=$? [ $RETVAL -ne 0 ] && return $RETVAL done return 0 } _shutdown() { f=$sysfs/$1 echo shutdown > $f/state } shutdown() { if [ "`echo $1 | head -c3`" == "mic" ]; then _shutdown $1 return $? fi for f in $sysfs/* do _shutdown `basename $f` RETVAL=$? [ $RETVAL -ne 0 ] && return $RETVAL done return 0 } _wait() { f=$sysfs/$1 while [ "`cat $f/state`" != "offline" -a "`cat $f/state`" != "online" ] do sleep 1 echo -e "Waiting for $1 to go offline" done } wait() { if [ "`echo $1 | head -c3`" == "mic" ]; then _wait $1 return $? fi # Wait for the cards to go offline for f in $sysfs/* do _wait `basename $f` RETVAL=$? [ $RETVAL -ne 0 ] && return $RETVAL done return 0 } if [ ! -d "$sysfs" ]; then echo -e $"Module unloaded " exit 3 fi case $1 in -s) status $2 ;; -r) reset $2 ;; -b) boot $2 ;; -S) shutdown $2 ;; -w) wait $2 ;; *) echo $"Usage: $0 {-s (status) |-r (reset) |-b (boot) |-S (shutdown) |-w (wait)}" exit 2 esac exit $? ommit/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>root/sound/pci/hda/patch_realtek.c
diff options
context:
space:
mode:
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 /sound/pci/hda/patch_realtek.c
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 'sound/pci/hda/patch_realtek.c')