/*************************************************************************** * au88x0_cxtalk.h * * Wed Nov 19 19:07:17 2003 * Copyright 2003 mjander * mjander@users.sourceforge.org ****************************************************************************/ /* * 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 of the License, 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* The crosstalk canceler supports 5 stereo input channels. The result is available at one single output route pair (stereo). */ #ifndef _AU88X0_CXTALK_H #define _AU88X0_CXTALK_H #include "au88x0.h" #define XTDLINE_SZ 32 #define XTGAINS_SZ 10 #define XTINST_SZ 4 #define XT_HEADPHONE 1 #define XT_SPEAKER0 2 #define XT_SPEAKER1 3 #define XT_DIAMOND 4 typedef u32 xtalk_dline_t[XTDLINE_SZ]; typedef u16 xtalk_gains_t[XTGAINS_SZ]; typedef u16 xtalk_instate_t[XTINST_SZ]; typedef u16 xtalk_coefs_t[5][5]; typedef u16 xtalk_state_t[5][4]; static void vortex_XtalkHw_SetGains(vortex_t * vortex, xtalk_gains_t const gains); static void vortex_XtalkHw_SetGainsAllChan(vortex_t * vortex); static void vortex_XtalkHw_SetSampleRate(vortex_t * vortex, u32 sr); static void vortex_XtalkHw_ProgramPipe(vortex_t * vortex); static void vortex_XtalkHw_ProgramPipe(vortex_t * vortex); static void vortex_XtalkHw_ProgramXtalkWide(vortex_t * vortex); static void vortex_XtalkHw_ProgramXtalkNarrow(vortex_t * vortex); static void vortex_XtalkHw_ProgramDiamondXtalk(vortex_t * vortex); static void vortex_XtalkHw_Enable(vortex_t * vortex); static void vortex_XtalkHw_Disable(vortex_t * vortex); static void vortex_XtalkHw_init(vortex_t * vortex); #endif /* _AU88X0_CXTALK_H */ t' action='/cgit.cgi/linux/net-next.git/log/tools/testing/selftests/rcutorture/configs'>
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authorEric W. Biederman <ebiederm@xmission.com>2017-01-03 14:18:43 +1300
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:43 +1300
commit3895dbf8985f656675b5bde610723a29cbce3fa7 (patch)
tree91d4517f09918fd573998eb40b8f35f08ed1c470 /tools/testing/selftests/rcutorture/configs
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
mnt: Protect the mountpoint hashtable with mount_lock
Protecting the mountpoint hashtable with namespace_sem was sufficient until a call to umount_mnt was added to mntput_no_expire. At which point it became possible for multiple calls of put_mountpoint on the same hash chain to happen on the same time. Kristen Johansen <kjlx@templeofstupid.com> reported: > This can cause a panic when simultaneous callers of put_mountpoint > attempt to free the same mountpoint. This occurs because some callers > hold the mount_hash_lock, while others hold the namespace lock. Some > even hold both. > > In this submitter's case, the panic manifested itself as a GP fault in > put_mountpoint() when it called hlist_del() and attempted to dereference > a m_hash.pprev that had been poisioned by another thread. Al Viro observed that the simple fix is to switch from using the namespace_sem to the mount_lock to protect the mountpoint hash table. I have taken Al's suggested patch moved put_mountpoint in pivot_root (instead of taking mount_lock an additional time), and have replaced new_mountpoint with get_mountpoint a function that does the hash table lookup and addition under the mount_lock. The introduction of get_mounptoint ensures that only the mount_lock is needed to manipulate the mountpoint hashtable. d_set_mounted is modified to only set DCACHE_MOUNTED if it is not already set. This allows get_mountpoint to use the setting of DCACHE_MOUNTED to ensure adding a struct mountpoint for a dentry happens exactly once. Cc: stable@vger.kernel.org Fixes: ce07d891a089 ("mnt: Honor MNT_LOCKED when detaching mounts") Reported-by: Krister Johansen <kjlx@templeofstupid.com> Suggested-by: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'tools/testing/selftests/rcutorture/configs')