• R
    uartlite: fix crash when using as console · 03eac7bb
    Richard Röjfors 提交于
    Move the ulite_console_setup to the .devinit section since it might be
    called on probe, which is in devinit.  Fixes the crash below where the
    uartlite hw is probed after the .init section is freed from the kernel.
    
    uartlite: ttyUL0 at MMIO 0xc8000100 (irq = 30) is a uartlite
    BUG: unable to handle kernel NULL pointer dereference at (null)
    IP: [<c176720e>] ulite_console_setup+0x6f/0xa8
    *pdpt = 0000000036fb0001 *pde = 0000000000000000
    Oops: 0000 [#1] PREEMPT SMP
    last sysfs file: /sys/devices/pci0000:00/0000:00:1f.1/host0/uevent
    Modules linked in: puffin(+) serio_raw
    
    Pid: 151, comm: modprobe Not tainted (2.6.31.5-1.0.b1-b1 #1) POULSBO
    EIP: 0060:[<c176720e>] EFLAGS: 00010246 CPU: 0
    EIP is at ulite_console_setup+0x6f/0xa8
    EAX: c16ec824 EBX: c16ec824 ECX: c176719f EDX: 00000000
    ESI: 00000000 EDI: c17b42c4 EBP: f6fd1cf0 ESP: f6fd1cd8
     DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    Process modprobe (pid: 151, ti=f6fd0000 task=f6fa1020 task.ti=f6fd0000)
    Stack:
     c1031f51 00000000 00000000 00000246 c182237c f7742000 f6fd1d5c c11fd316
    <0> c16ec85c f77420d4 0000001e 00000000 00000000 c1633e78 4f494d4d 63783020
    <0> 30303038 00303031 f6fd1d3c c10e0786 f6fd1d48 00000000 f6fd1d48 00000000
    Call Trace:
     [<c1031f51>] ? register_console+0xf6/0x1fc
     [<c11fd316>] ? uart_add_one_port+0x237/0x2bb
     [<c10e0786>] ? sysfs_add_one+0x13/0xd3
     [<c10e142f>] ? sysfs_do_create_link+0xba/0xfc
     [<c146f200>] ? ulite_probe+0x198/0x1eb
     [<c12064ee>] ? platform_drv_probe+0xc/0xe
     [<c120597b>] ? driver_probe_device+0x79/0x105
     [<c1205a8e>] ? __device_attach+0x28/0x30
     [<c120511f>] ? bus_for_each_drv+0x3d/0x67
     [<c1205af9>] ? device_attach+0x44/0x58
     [<c1205a66>] ? __device_attach+0x0/0x30
     [<c1204fb8>] ? bus_probe_device+0x1f/0x34
     [<c1203e68>] ? device_add+0x385/0x4c0
     [<c148491f>] ? _write_unlock+0x8/0x1f
     [<c1206aac>] ? platform_device_add+0xd9/0x11c
     [<c120c685>] ? mfd_add_devices+0x165/0x1bc
     [<f831b378>] ? puffin_probe+0x2d0/0x390 [puffin]
     [<c11a08ef>] ? pci_match_device+0xa0/0xa7
     [<c11a07bc>] ? local_pci_probe+0xe/0x10
     [<c11a11db>] ? pci_device_probe+0x43/0x66
     [<c120597b>] ? driver_probe_device+0x79/0x105
     [<c1205a4a>] ? __driver_attach+0x43/0x5f
     [<c120535d>] ? bus_for_each_dev+0x3d/0x67
     [<c1205852>] ? driver_attach+0x14/0x16
     [<c1205a07>] ? __driver_attach+0x0/0x5f
     [<c1204dea>] ? bus_add_driver+0xf9/0x220
     [<c1205c8f>] ? driver_register+0x8b/0xeb
     [<c11a1518>] ? __pci_register_driver+0x43/0x9f
     [<c10477ef>] ? __blocking_notifier_call_chain+0x40/0x4c
     [<f831f000>] ? puffin_init+0x0/0x48 [puffin]
     [<f831f017>] ? puffin_init+0x17/0x48 [puffin]
     [<c1001139>] ? do_one_initcall+0x4c/0x131
     [<c105607b>] ? sys_init_module+0xa7/0x1b7
     [<c1002a61>] ? syscall_call+0x7/0xb
     Code: 6e 74 00 00 00 92 33 00 00 18 00 0e 01 73 79 6e 63 65 2d 72 65 67 69 73 74 72 79 0c 00 49 32
    00 00 14 00 09 01 61 6c 73 61 2d 69 <6e> 66 6f 00 00 00 42 37 00 00 10 00 07 01 6b 69 6c 6c 61 6c 6c
    EIP: [<c176720e>] ulite_console_setup+0x6f/0xa8 SS:ESP 0068:f6fd1cd8
    CR2: 0000000000000000
    Signed-off-by: NRichard Röjfors <richard.rojfors@pelagicore.com>
    Acked-by: NPeter Korsgaard <jacmet@sunsite.dk>
    Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
    Cc: <stable@kernel.org>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    03eac7bb
uartlite.c 15.9 KB