1. 11 May, 2010 11 commits
    • Alan Cox's avatar
      resource: shared I/O region support · 8b6d043b
      Alan Cox authored
      
      
      SuperIO devices share regions and use lock/unlock operations to chip
      select.  We therefore need to be able to request a resource and wait for
      it to be freed by whichever other SuperIO device currently hogs it.
      Right now you have to poll which is horrible.
      
      Add a MUXED field to IO port resources. If the MUXED field is set on the
      resource and on the request (via request_muxed_region) then we block
      until the previous owner of the muxed resource releases their region.
      
      This allows us to implement proper resource sharing and locking for
      superio chips using code of the form
      
      enable_my_superio_dev() {
      	request_muxed_region(0x44, 0x02, "superio:watchdog");
      	outb() ..sequence to enable chip
      }
      
      disable_my_superio_dev() {
      	outb() .. sequence of disable chip
      	release_region(0x44, 0x02);
      }
      Signed-off-by: default avatarGiel van Schijndel <me@mortis.eu>
      Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      8b6d043b
    • Thomas Gleixner's avatar
      x86/PCI: Convert pci_config_lock to raw_spinlock · d19f61f0
      Thomas Gleixner authored
      
      
      pci_config_lock must be a real spinlock in preempt-rt. Convert it to
      raw_spinlock. No change for !RT kernels.
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      d19f61f0
    • Thomas Gleixner's avatar
      PCI: Convert pci_lock to raw_spinlock · 511dd98c
      Thomas Gleixner authored
      
      
      pci_lock must be a real spinlock in preempt-rt. Convert it to
      raw_spinlock. No change for !RT kernels.
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      511dd98c
    • Alan Stern's avatar
      PCI: clearing wakeup flags not needed · 52b265a1
      Alan Stern authored
      
      
      This patch (as1353) removes a couple of unnecessary assignments from
      the PCI core.  The should_wakeup flag is naturally initialized to 0;
      there's no need to clear it.
      Acked-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      52b265a1
    • Alex Chiang's avatar
      PCI: create function symlinks in /sys/bus/pci/slots/N/ · 75568f80
      Alex Chiang authored
      
      
      Create convenience symlinks in sysfs, linking slots to device
      functions, and vice versa. These links make it easier for users to
      figure out which devices actually live in what slots.
      
      For example:
      
      sapphire:/sys/bus/pci/slots # ls
      1  10  2  3  4  5  6  7  8  9
      
      sapphire:/sys/bus/pci/slots # ls -l 3
      total 0
      -r--r--r-- 1 root root 65536 Aug 18 14:10 address
      lrwxrwxrwx 1 root root     0 Aug 18 14:10 function0 ->
      ../../../../devices/pci0000:23/0000:23:01.0
      lrwxrwxrwx 1 root root     0 Aug 18 14:10 function1 ->
      ../../../../devices/pci0000:23/0000:23:01.1
      
      sapphire:/sys/bus/pci/slots # ls -l 3/function0/slot
      lrwxrwxrwx 1 root root 0 Aug 18 14:13 3/function0/slot ->
      ../../../bus/pci/slots/3
      
      The original form of this patch was written by Matthew Wilcox,
      and was enhanced to include links from the sysfs slots/ directory
      pointing back at the device functions.
      
      Cc: willy@linux.intel.com
      Signed-off-by: default avatarAlex Chiang <achiang@hp.com>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      75568f80
    • Linus Torvalds's avatar
      fc2a093e
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 · 9fc282ba
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
        net: Fix FDDI and TR config checks in ipv4 arp and LLC.
        IPv4: unresolved multicast route cleanup
        mac80211: remove association work when processing deauth request
        ar9170: wait for asynchronous firmware loading
        ipv4: udp: fix short packet and bad checksum logging
        phy: Fix initialization in micrel driver.
        sctp: Fix a race between ICMP protocol unreachable and connect()
        veth: Dont kfree_skb() after dev_forward_skb()
        IPv6: fix IPV6_RECVERR handling of locally-generated errors
        net/gianfar: drop recycled skbs on MTU change
        iwlwifi: work around passive scan issue
      9fc282ba
    • David Howells's avatar
      CacheFiles: Fix occasional EIO on call to vfs_unlink() · c61ea31d
      David Howells authored
      
      
      Fix an occasional EIO returned by a call to vfs_unlink():
      
      	[ 4868.465413] CacheFiles: I/O Error: Unlink failed
      	[ 4868.465444] FS-Cache: Cache cachefiles stopped due to I/O error
      	[ 4947.320011] CacheFiles: File cache on md3 unregistering
      	[ 4947.320041] FS-Cache: Withdrawing cache "mycache"
      	[ 5127.348683] FS-Cache: Cache "mycache" added (type cachefiles)
      	[ 5127.348716] CacheFiles: File cache on md3 registered
      	[ 7076.871081] CacheFiles: I/O Error: Unlink failed
      	[ 7076.871130] FS-Cache: Cache cachefiles stopped due to I/O error
      	[ 7116.780891] CacheFiles: File cache on md3 unregistering
      	[ 7116.780937] FS-Cache: Withdrawing cache "mycache"
      	[ 7296.813394] FS-Cache: Cache "mycache" added (type cachefiles)
      	[ 7296.813432] CacheFiles: File cache on md3 registered
      
      What happens is this:
      
       (1) A cached NFS file is seen to have become out of date, so NFS retires the
           object and immediately acquires a new object with the same key.
      
       (2) Retirement of the old object is done asynchronously - so the lookup/create
           to generate the new object may be done first.
      
           This can be a problem as the old object and the new object must exist at
           the same point in the backing filesystem (i.e. they must have the same
           pathname).
      
       (3) The lookup for the new object sees that a backing file already exists,
           checks to see whether it is valid and sees that it isn't.  It then deletes
           that file and creates a new one on disk.
      
       (4) The retirement phase for the old file is then performed.  It tries to
           delete the dentry it has, but ext4_unlink() returns -EIO because the inode
           attached to that dentry no longer matches the inode number associated with
           the filename in the parent directory.
      
      The trace below shows this quite well.
      
      	[md5sum] ==> __fscache_relinquish_cookie(ffff88002d12fb58{NFS.fh,ffff88002ce62100},1)
      	[md5sum] ==> __fscache_acquire_cookie({NFS.server},{NFS.fh},ffff88002ce62100)
      
      NFS has retired the old cookie and asked for a new one.
      
      	[kslowd] ==> fscache_object_state_machine({OBJ52,OBJECT_ACTIVE,24})
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_DYING]
      	[kslowd] ==> fscache_object_state_machine({OBJ53,OBJECT_INIT,0})
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_LOOKING_UP]
      	[kslowd] ==> fscache_object_state_machine({OBJ52,OBJECT_DYING,24})
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_RECYCLING]
      
      The old object (OBJ52) is going through the terminal states to get rid of it,
      whilst the new object - (OBJ53) - is coming into being.
      
      	[kslowd] ==> fscache_object_state_machine({OBJ53,OBJECT_LOOKING_UP,0})
      	[kslowd] ==> cachefiles_walk_to_object({ffff88003029d8b8},OBJ53,@68,)
      	[kslowd] lookup '@68'
      	[kslowd] next -> ffff88002ce41bd0 positive
      	[kslowd] advance
      	[kslowd] lookup 'Es0g00og0_Nd_XCYe3BOzvXrsBLMlN6aw16M1htaA'
      	[kslowd] next -> ffff8800369faac8 positive
      
      The new object has looked up the subdir in which the file would be in (getting
      dentry ffff88002ce41bd0) and then looked up the file itself (getting dentry
      ffff8800369faac8).
      
      	[kslowd] validate 'Es0g00og0_Nd_XCYe3BOzvXrsBLMlN6aw16M1htaA'
      	[kslowd] ==> cachefiles_bury_object(,'@68','Es0g00og0_Nd_XCYe3BOzvXrsBLMlN6aw16M1htaA')
      	[kslowd] remove ffff8800369faac8 from ffff88002ce41bd0
      	[kslowd] unlink stale object
      	[kslowd] <== cachefiles_bury_object() = 0
      
      It then checks the file's xattrs to see if it's valid.  NFS says that the
      auxiliary data indicate the file is out of date (obvious to us - that's why NFS
      ditched the old version and got a new one).  CacheFiles then deletes the old
      file (dentry ffff8800369faac8).
      
      	[kslowd] redo lookup
      	[kslowd] lookup 'Es0g00og0_Nd_XCYe3BOzvXrsBLMlN6aw16M1htaA'
      	[kslowd] next -> ffff88002cd94288 negative
      	[kslowd] create -> ffff88002cd94288{ffff88002cdaf238{ino=148247}}
      
      CacheFiles then redoes the lookup and gets a negative result in a new dentry
      (ffff88002cd94288) which it then creates a file for.
      
      	[kslowd] ==> cachefiles_mark_object_active(,OBJ53)
      	[kslowd] <== cachefiles_mark_object_active() = 0
      	[kslowd] === OBTAINED_OBJECT ===
      	[kslowd] <== cachefiles_walk_to_object() = 0 [148247]
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_AVAILABLE]
      
      The new object is then marked active and the state machine moves to the
      available state - at which point NFS can start filling the object.
      
      	[kslowd] ==> fscache_object_state_machine({OBJ52,OBJECT_RECYCLING,20})
      	[kslowd] ==> fscache_release_object()
      	[kslowd] ==> cachefiles_drop_object({OBJ52,2})
      	[kslowd] ==> cachefiles_delete_object(,OBJ52{ffff8800369faac8})
      
      The old object, meanwhile, goes on with being retired.  If allocation occurs
      first, cachefiles_delete_object() has to wait for dir->d_inode->i_mutex to
      become available before it can continue.
      
      	[kslowd] ==> cachefiles_bury_object(,'@68','Es0g00og0_Nd_XCYe3BOzvXrsBLMlN6aw16M1htaA')
      	[kslowd] remove ffff8800369faac8 from ffff88002ce41bd0
      	[kslowd] unlink stale object
      	EXT4-fs warning (device sda6): ext4_unlink: Inode number mismatch in unlink (148247!=148193)
      	CacheFiles: I/O Error: Unlink failed
      	FS-Cache: Cache cachefiles stopped due to I/O error
      
      CacheFiles then tries to delete the file for the old object, but the dentry it
      has (ffff8800369faac8) no longer points to a valid inode for that directory
      entry, and so ext4_unlink() returns -EIO when de->inode does not match i_ino.
      
      	[kslowd] <== cachefiles_bury_object() = -5
      	[kslowd] <== cachefiles_delete_object() = -5
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_DEAD]
      	[kslowd] ==> fscache_object_state_machine({OBJ53,OBJECT_AVAILABLE,0})
      	[kslowd] <== fscache_object_state_machine() [->OBJECT_ACTIVE]
      
      (Note that the above trace includes extra information beyond that produced by
      the upstream code).
      
      The fix is to note when an object that is being retired has had its object
      deleted preemptively by a replacement object that is being created, and to
      skip the second removal attempt in such a case.
      Reported-by: default avatarGreg M <gregm@servu.net.au>
      Reported-by: default avatarMark Moseley <moseleymark@gmail.com>
      Reported-by: default avatarRomain DEGEZ <romain.degez@smartjog.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c61ea31d
    • Alex Chiang's avatar
      ACPI: sleep: eliminate duplicate entries in acpisleep_dmi_table[] · 7d6fb7bd
      Alex Chiang authored
      
      
      Duplicate entries ended up acpisleep_dmi_table[] by accident.
      They don't hurt functionality, but they are ugly, so let's get
      rid of them.
      
      Cc: stable@kernel.org
      Signed-off-by: default avatarAlex Chiang <achiang@canonical.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7d6fb7bd
    • David S. Miller's avatar
    • Jean Delvare's avatar
      drm/radeon: Fix 3 regressions - since buffer rework · c9ff04c9
      Jean Delvare authored
      Commit b4fe9454
      
       introduced 3 bugs,
      fix them:
      
      * Use the right command dword for second packet offset in
        RADEON_CNTL_PAINT/BITBLT_MULTI.
      * Don't leak memory if drm_buffer_copy_from_user() fails.
      * Don't call drm_buffer_unprocessed() unless drm_buffer_alloc() and
        drm_buffer_copy_from_user() have been called successfully first.
      Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      Cc: Pauli Nieminen <suokkos@gmail.com>
      Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      c9ff04c9
  2. 10 May, 2010 10 commits
  3. 07 May, 2010 18 commits
  4. 06 May, 2010 1 commit