1. 17 Oct, 2005 9 commits
    • Trond Myklebust's avatar
      [PATCH] NFS: Fix Oopsable/unnecessary i_count manipulations in nfs_wait_on_inode() · 6ce96917
      Trond Myklebust authored
      Oopsable since nfs_wait_on_inode() can get called as part of iput_final().
      Unnecessary since the caller had better be damned sure that the inode won't
      disappear from underneath it anyway.
      Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Trond Myklebust's avatar
      [PATCH] NFS: Fix cache consistency races · b3c52da3
      Trond Myklebust authored
      If the data cache has been marked as potentially invalid by nfs_refresh_inode,
      we should invalidate it rather than assume that changes are due to our own
      Also ensure that we always start with a valid cache before declaring it
      to be protected by a delegation.
      Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Christian Krause's avatar
      [PATCH] USB: fix bug in handling of highspeed usb HID devices · 13b58ee5
      Christian Krause authored
      During the development of an USB device I found a bug in the handling of
      Highspeed HID devices in the kernel.
      What happened?
      Highspeed HID devices are correctly recognized and enumerated by the
      kernel. But even if usbhid kernel module is loaded, no HID reports are
      received by the kernel.
      The output of the hardware USB analyzer told me that the host doesn't
      even poll for interrupt IN transfers (even the "interrupt in" USB
      transfer are polled by the host).
      After some debugging in hid-core.c I've found the reason.
      In case of a highspeed device, the endpoint interval is re-calculated in
      line 1669:
                   /* handle potential highspeed HID correctly */
                   interval = endpoint->bInterval;
                   if (dev->speed == USB_SPEED_HIGH)
                         interval = 1 << (interval - 1);
      Basically this calculation is correct (refer to USB 2.0 spec, 9.6.6).
      This new calculated value of "interval" is used as input for
      line 1685:
                  usb_fill_int_urb(hid->urbin, dev, pipe, hid->inbuf, 0,
                         hid_irq_in, hid, interval);
      Unfortunately the same calculation as above is done a second time in
      usb_fill_int_urb in the file include/linux/usb.h:
      line 933:
              if (dev->speed == USB_SPEED_HIGH)
                      urb->interval = 1 << (interval - 1);
                      urb->interval = interval;
      This means, that if the endpoint descriptor (of a high speed device)
      specifies e.g. bInterval = 7, the urb->interval gets the value:
      hid-core.c: interval = 1 << (7-1) = 0x40 = 64
      urb->interval = 1 << (interval -1) = 1 << (63) = integer overflow
      Because of this the value of urb->interval is sometimes negative and is
      rejected in core/urb.c:
      line 353:
                      /* too small? */
                      if (urb->interval <= 0)
                              return -EINVAL;
      The conclusion is, that the recalculaton of the interval (which is
      necessary for highspeed) should not be made twice, because this is
      simply wrong. ;-)
      Re-calculation in usb_fill_int_urb makes more sense, because it is the
      most general approach. So it would make sense to remove it from
      Because in hid-core.c the interval variable is only used for calling
      usb_fill_int_urb, it is no problem to remove the highspeed
      re-calculation in this file.
      Signed-off-by: default avatarChristian Krause <chkr@plauener.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Olav Kongas's avatar
      [PATCH] isp116x-hcd: fix handling of short transfers · e9b765de
      Olav Kongas authored
      Increased use of scatter-gather by usb-storage driver after 2.6.13 has
      exposed a buggy codepath in isp116x-hcd, which was probably never
      visited before: bug happened only for those urbs, for which
      URB_SHORT_NOT_OK was set AND short transfer occurred.
      The fix attached was tested in 2 ways: (a) it fixed failing
      initialization of a flash drive with an embedded hub; (b) the fix was
      tested with 'usbtest' against a modified g_zero driver (on top of
      net2280), which generated short bulk IN transfers of various lengths
      including multiples and non-multiples of max_packet_length.
      Signed-off-by: default avatarOlav Kongas <ok@artecdesign.ee>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Linus Torvalds's avatar
      Increase default RCU batching sharply · 2cc78eb5
      Linus Torvalds authored
      Dipankar made RCU limit the batch size to improve latency, but that
      approach is unworkable: it can cause the RCU queues to grow without
      bounds, since the batch limiter ended up limiting the callbacks.
      So make the limit much higher, and start planning on instead limiting
      the batch size by doing RCU callbacks more often if the queue looks like
      it might be growing too long.
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Ronald S. Bultje's avatar
      [PATCH] fix black/white-only svideo input in vpx3220 decoder · de21eb63
      Ronald S. Bultje authored
      Fix the fact that the svideo input will only give input in black/white in
      some circumstances.  Reason is that in the PCI controller driver (zr36067),
      after setting input, we reset norm, which overwrites the input register
      with the default.  This patch makes it always set the correct value for the
      input when changing norm.
      Signed-off-by: default avatarRonald S. Bultje <rbultje@ronald.bitfreak.net>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Ronald S. Bultje's avatar
      [PATCH] fix vpx3220 offset issue in SECAM · 9b3acc21
      Ronald S. Bultje authored
      Fix bug #5404 in kernel bugzilla.
      It basically updates the vpx3220 initialization tables with some newer
      values that we've had in CVS for a while (and that, for some reason, never
      ended up in the kernel...  must've gotten lost).  Those fix a ~16 pixels
      noise at the top of the picture in at least SECAM, although (now that I
      think about it) PAL was probably affected, also.
      Signed-off-by: default avatarRonald S. Bultje <rbultje@ronald.bitfreak.net>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Samuel Thibault's avatar
      [PATCH] SVGATextMode fix · 0aec4867
      Samuel Thibault authored
      Fix bug 5441.
      I didn't know about messy programs like svgatextmode...  Couldn't this be
      integrated in some linux/drivers/video/console/svgacon.c ?...  So because
      of the existence of the svgatextmode program, the kernel is not supposed to
      Disabling the check in vgacon_resize() might help indeed, but I'm really
      not sure whether it will work for any chipset: in my patch, CRT registers
      are set at each console switch, since stty rows/cols apply to consoles
      The attached solution is to keep the test, but if it fails, we assume that
      the caller knows what it does (i.e.  it is svgatextmode) and then disable
      any further call to vgacon_doresize.  Svgatextmode is usually used to
      _expand_ the display, not to shrink it.  And it is harmless in the case of
      a too big stty rows/cols: the display will just be cropped.  I tested it on
      my laptop, and it works fine with svgatextmode.
      A better solution would be that svgatextmode explicitely tells the kernel
      not to care about video timing, but for this an interface needs be defined
      and svgatextmode be patched.
      Signed-off-by: default avatarSamuel Thibault <samuel.thibault@ens-lyon.org>
      Cc: "Antonino A. Daplas" <adaplas@pol.net>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Herbert Xu's avatar
      [PATCH] list: add missing rcu_dereference on first element · b24d18aa
      Herbert Xu authored
      It seems that all the list_*_rcu primitives are missing a memory barrier
      on the very first dereference.  For example,
      #define list_for_each_rcu(pos, head) \
      	for (pos = (head)->next; prefetch(pos->next), pos != (head); \
      		pos = rcu_dereference(pos->next))
      It will go something like:
      	pos = (head)->next
      	pos != (head)
      	do stuff
      We're missing a barrier here.
      	pos = rcu_dereference(pos->next)
      		fetch pos->next
      		barrier given by rcu_dereference(pos->next)
      		store pos
      Without the missing barrier, the pos->next value may turn out to be stale.
      In fact, if "do stuff" were also dereferencing pos and relying on
      list_for_each_rcu to provide the barrier then it may also break.
      So here is a patch to make sure that we have a barrier for the first
      element in the list.
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Acked-by: default avatar"Paul E. McKenney" <paulmck@us.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  2. 16 Oct, 2005 2 commits
    • Linus Torvalds's avatar
      Fix memory ordering bug in page reclaim · 3d80636a
      Linus Torvalds authored
      As noticed by Nick Piggin, we need to make sure that we check the page
      count before we check for PageDirty, since the dirty check is only valid
      if the count implies that we're the only possible ones holding the page.
      We always did do this, but the code needs a read-memory-barrier to make
      sure that the orderign is also honored by the CPU.
      (The writer side is ordered due to the atomic decrement and test on the
      page count, see the discussion on linux-kernel)
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Al Viro's avatar
      [PATCH]: highest_possible_processor_id() has to be a macro · 688ce17b
      Al Viro authored
      	... otherwise, things like alpha and sparc64 break and break
      badly.  They define cpu_possible_map to something else in smp.h
      *AFTER* having included cpumask.h.
      	If that puppy is a macro, expansion will happen at the actual
      caller, when we'd already seen #define cpu_possible_map ... and we will
      get the right thing used.
      	As an inline helper it will be tokenized before we get to that
      define and that's it; no matter what we define later, it won't affect
      anything.  We get modules with dependency on cpu_possible_map instead
      of the right symbol (phys_cpu_present_map in case of sparc64), or outright
      link errors if they are built-in.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
  3. 15 Oct, 2005 1 commit
  4. 14 Oct, 2005 28 commits