2.6.4rc1, exception in setfont, con_set_unimap()

[Olaf Hering]

James,

we get an oops on ppc64, matroxfb, the installer runs setfont. backtrace
is below.
Should I just add a if(!p) return -ENODEV; or is there a better fix?


1:mon> t
c00000003f573be0  c00000000022858c  .con_font_op+0x2f4/0x43c
c00000003f573cd0  c00000000002746c  .do_unimap_ioctl+0xc4/0x154
c00000003f573d70  c0000000000eb278  .compat_sys_ioctl+0x174/0x324
c00000003f573e30  c00000000000f0e4  ret_from_syscall_1
exception: c00 (System Call) regs c00000003f573ea0
                  000000000ff77e0c
<Stack drops into userspace 00000000ffffe280>
1:mon> e
cpu 1: Vector: 300 (Data Access) at [c00000003f573960]
    pc: c0000000002224c8 (.con_set_unimap+0x74/0x29c)
    lr: c00000000002746c (.do_unimap_ioctl+0xc4/0x154)
    sp: c00000003f573be0
   msr: a000000000009032
   dar: 130
 dsisr: 40000000
  current = 0xc00000000abfad80
  paca    = 0xc000000000426000
    pid   = 303, comm = setfont

------- Additional Comments From olh@xxxxxxx  2004-03-05 16:59 -------
it dies here:
con_set_unimap(int con, ushort ct, struct unipair *list)
{
        int err = 0, err1, i;
        struct uni_pagedir *p, *q;
        struct vc_data *conp = vc_cons[con].d;

        p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc;
        if (p->readonly) return -EIO;

p == r25 == NULL.
con == 0
ct == 0000000000000221
list == 0000000010027710

vc_cons[] == c000000000731040

1:mon> d c000000000731040
c000000000731040 c0000000008a5500 c00000013ee6dc00  |......U.....>...|
c000000000731050 c00000000a5ba000 c00000000a5ba200  |.....[.......[..|
c000000000731060 c00000000a5c6e00 c000000003f98200  |.....\n.........|
c000000000731070 0000000000000000 0000000000000000  |................|

1:mon> d c0000000008a5680 (c0000000008a5500+0x180)
c0000000008a5680 c0000000008a5678 0000000000000000  |......Vx........|
c0000000008a5690 0000000000000000 0000000000000000  |................|
c0000000008a56a0 0000000000000000 0000000000000000  |................|
c0000000008a56b0 0000000000000000 0000000000000000  |................|

1:mon> d c0000000008a5678
c0000000008a5678 0000000000000000 c0000000008a5678  |..............Vx|
c0000000008a5688 0000000000000000 0000000000000000  |................|
c0000000008a5698 0000000000000000 0000000000000000  |................|
c0000000008a56a8 0000000000000000 0000000000000000  |................|


----- End forwarded message -----

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