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  1. 28 5月, 2008 3 次提交
    • K
      pciehp: fix slow probing · 5808639b
      由 Kenji Kaneshige 提交于 
      Fix the "pciehp probing slow" problem reported from Jan C. Nordholz in
http://bugzilla.kernel.org/show_bug.cgi?id=10751.

The command completed bit in Slot Status register applies only to
commands issued to control the attention indicator, power indicator,
power controller, or electromechanical interlock. However, writes to
other parts of the Slot Control register would end up writing to the
control fields. Hence, any write to Slot Control register is
considered as a command. However, if the controller doesn't support
any of attention indicator, power indicator, power controller and
electromechanical interlock, command completed bit would not set in
writing to Slot Control register. In this case, we should not wait for
command completed bit set, otherwise all commands would be considered
not completed in timeout seconds (1 sec.).

The cause of the problem is pciehp driver didn't take this situation
into account. This patch changes pciehp to take it into account. This
patch also add the check for "No Command Completed Support" bit in
Slot Capability register. If it is set, we should not wait for command
completed bit set as well.

This problem seems to be revealed by the commit
c27fb883 that fixed the bug that
pciehp did not wait for command completed properly (pciehp just
ignored the command completion event).
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
      5808639b
    • K
      pciehp: fix NULL dereference in interrupt handler · dbd79aed
      由 Kenji Kaneshige 提交于 
      Fix the following NULL dereference problem reported from Pierre Ossman
and Ingo Molnar.

pciehp: HPC vendor_id 8086 device_id 27d0 ss_vid 0 ss_did 0
pciehp: pciehp_find_slot: slot (device=0x0) not found
BUG: unable to handle kernel NULL pointer dereference at 0000000000000070
IP: [<ffffffff80494a8b>] pciehp_handle_presence_change+0x7e/0x113
PGD 0
Oops: 0000 [1]
CPU 0
Modules linked in:
Pid: 1, comm: swapper Tainted: G        W 2.6.26-rc3-sched-devel.git-00001-g2b99b26-dirty #170
RIP: 0010:[<ffffffff80494a8b>]  [<ffffffff80494a8b>] pciehp_handle_presence_change+0x7e/0x113
RSP: 0000:ffff81003f83fbb0  EFLAGS: 00010046
RAX: 0000000000000039 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000046
RBP: ffff81003f83fbd0 R08: 0000000000000001 R09: ffffffff80245103
R10: 0000000000000020 R11: 0000000000000000 R12: ffff81003ea53a30
R13: 0000000000000000 R14: 0000000000000011 R15: ffffffff80495926
FS:  0000000000000000(0000) GS:ffffffff80be7400(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000070 CR3: 0000000000201000 CR4: 00000000000006a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 1, threadinfo ffff81003f83e000, task ffff81003f840000)
Stack:  0000000000000008 ffff81003f83fbf6 ffff81003ea53a30 0000000000000008
 ffff81003f83fc10 ffffffff80495ab4 0000000000000011 0000000000000002
 0000000000000202 0000000000000202 00000000fffffff4 ffff81003ea53a30
Call Trace:
 [<ffffffff80495ab4>] pcie_isr+0x18e/0x1bc
 [<ffffffff80260831>] request_irq+0x106/0x12f
 [<ffffffff80495fb6>] pcie_init+0x15e/0x6cc
 [<ffffffff804933a3>] pciehp_probe+0x64/0x541
 [<ffffffff8048f4e7>] pcie_port_probe_service+0x4c/0x76
 [<ffffffff8054af70>] driver_probe_device+0xd4/0x1f0
 [<ffffffff8054b108>] __driver_attach+0x7c/0x7e
 [<ffffffff8054b08c>] ? __driver_attach+0x0/0x7e
 [<ffffffff8054a4b6>] bus_for_each_dev+0x53/0x7d
 [<ffffffff8054ad3c>] driver_attach+0x1c/0x1e
 [<ffffffff8054a9c2>] bus_add_driver+0xdd/0x25b
 [<ffffffff80c09d3d>] ? pcied_init+0x0/0x8b
 [<ffffffff8054b288>] driver_register+0x5f/0x13e
 [<ffffffff80c09d3d>] ? pcied_init+0x0/0x8b
 [<ffffffff8048f441>] pcie_port_service_register+0x47/0x49
 [<ffffffff80c09d52>] pcied_init+0x15/0x8b
 [<ffffffff80bf3938>] kernel_init+0x75/0x243
 [<ffffffff808639d2>] ? _spin_unlock_irq+0x2b/0x3a
 [<ffffffff80228d1f>] ? finish_task_switch+0x57/0x9a
 [<ffffffff8020c258>] child_rip+0xa/0x12
 [<ffffffff8020bcec>] ? restore_args+0x0/0x30
 [<ffffffff80bf38c3>] ? kernel_init+0x0/0x243
 [<ffffffff8020c24e>] ? child_rip+0x0/0x12

Code: 83 80 00 00 00 48 39 f0 75 e1 0f b6 c9 48 c7 c2 00 0e 8d 80 48 c7 c6 8a 60 a6 80 48 c7 c7 10 db a8 80 31 c0 e8 3f 8d d9 ff 31 db <48> 8b 43 70 48 8d 75 ef 48 89 df ff 50 30 80 7d ef 00 74 37 48
RIP  [<ffffffff80494a8b>] pciehp_handle_presence_change+0x7e/0x113
 RSP <ffff81003f83fbb0>
CR2: 0000000000000070
Kernel panic - not syncing: Fatal exception

The situation under which it occurs is hw and timing related: it appears
to happen on a system that has PCI hotplug hardware but with no active
hotplug cards, and another interrupt in the same (shared) IRQ line
arrives too early, before the hotplug-slot entry has been set up - as
triggered by CONFIG_DEBUG_SHIRQ=y:

This patch contains the following two fixes.

(1) Clear all events bits in Slot Status register to prevent the pciehp
    driver from detecting the spurious events that would have been occur
    before pciehp loading.

(2) Add check whether slot initialization had been already done.

This is short term fix. We need more structural fixes to install
interrupt handler after slot initialization is done.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
      dbd79aed
    • K
      shpchp: add message about shpchp_slot_with_bus option · b3bd307c
      由 Kenji Kaneshige 提交于 
      Some (broken?) platform assign the same slot name to multiple hotplug
slots. On such system, slot initialization would fail because of name
collision. The shpchp driver already have a "slot_with_bus" module
option which adds the bus number into the slot name. This patch adds
the message about this module option that will be displayed when slot
name collision is detected.
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
      b3bd307c
  3. 22 5月, 2008 1 次提交
  5. 16 5月, 2008 2 次提交
    • L
      Clean up 'print_fn_descriptor_symbol()' types · a442ac51
      由 Linus Torvalds 提交于 
      Everybody wants to pass it a function pointer, and in fact, that is what
you _must_ pass it for it to make sense (since it knows that ia64 and
ppc64 use descriptors for function pointers and fetches the actual
address from there).

So don't make the argument be a 'unsigned long' and force everybody to
add a cast.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      a442ac51
    • I
      tty: fix BKL related leak and crash · 487ad7ef
      由 Ingo Molnar 提交于 
      Enabling the BKL to be lockdep tracked uncovered the following
upstream kernel bug in the tty code, which caused a BKL
reference leak:

  ================================================
  [ BUG: lock held when returning to user space! ]
  ------------------------------------------------
  dmesg/3121 is leaving the kernel with locks still held!
  1 lock held by dmesg/3121:
   #0:  (kernel_mutex){--..}, at: [<c02f34d9>] opost+0x24/0x194

this might explain some of the atomicity warnings and crashes
that -tip tree testing has been experiencing since the BKL
was converted back to a spinlock.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      487ad7ef
  7. 15 5月, 2008 34 次提交