• James Bottomley's avatar
    [SCSI] mvsas: Fix kernel panic on tile due to unaligned data access · 53a983c4
    James Bottomley authored
    slot->response is a 64 bit quantity (and accessed as such), but its alignment
    is only 32 bits.  This doesn't cause a problem on x86, but apparently causes a
    kernel panic on Tile:
    
    Stack dump complete Kernel panic - not syncing:
     Kernel unalign fault running the idle task!
     Starting stack dump of tid 0, pid 0 (swapper) on cpu 1 at cycle 341586172541
       frame 0: 0xfffffff700140ee0 dump_stack+0x0/0x20 (sp 0xfffffe43ffedf420)
       frame 1: 0xfffffff700283270 panic+0x150/0x3a0 (sp 0xfffffe43ffedf420)
       frame 2: 0xfffffff70012bff8 jit_bundle_gen+0xfd8/0x27e0 (sp 0xfffffe43ffedf4c8)
       frame 3: 0xfffffff7003b5b68 do_unaligned+0xc0/0x5a0 (sp 0xfffffe43ffedf710)
       frame 4: 0xfffffff70044ca78 handle_interrupt+0x270/0x278 (sp 0xfffffe43ffedf840)
       <interrupt 17 while in kernel mode>
       frame 5: 0xfffffff7002ac370 mvs_slot_complete+0x5f0/0x12a0 (sp 0xfffffe43ffedfa90)
       frame 6: 0xfffffff7002abec0 mvs_slot_complete+0x140/0x12a0 (sp 0xfffffe43ffedfa90)
       frame 7: 0xfffffff7005cc840 mvs_int_rx+0x140/0x2a0 (sp 0xfffffe43ffedfb00)
       frame 8: 0xfffffff7005bbaf0 mvs_94xx_isr+0xd8/0x2b8 (sp 0xfffffe43ffedfb68)
       frame 9: 0xfffffff700658ba0 mvs_tasklet+0x128/0x1f8 (sp 0xfffffe43ffedfba8)
       frame 10: 0xfffffff7003e8230 tasklet_action+0x178/0x2c8 (sp 0xfffffe43ffedfbe0)
       frame 11: 0xfffffff700103850 __do_softirq+0x210/0x398 (sp 0xfffffe43ffedfc40)
       frame 12: 0xfffffff700180308 do_softirq+0xc8/0x140 (sp 0xfffffe43ffedfcd8)
       frame 13: 0xfffffff7000bd7f0 irq_exit+0xb0/0x158 (sp 0xfffffe43ffedfcf0)
       frame 14: 0xfffffff70013fa58 tile_dev_intr+0x1d8/0x2f0 (sp 0xfffffe43ffedfd00)
       frame 15: 0xfffffff70044ca78 handle_interrupt+0x270/0x278 (sp 0xfffffe43ffedfd40)
       <interrupt 30 while in kernel mode>
       frame 16: 0xfffffff700143e68 _cpu_idle_nap+0x0/0x18 (sp 0xfffffe43ffedffb0)
       frame 17: 0xfffffff700482480 cpu_idle+0x310/0x428 (sp 0xfffffe43ffedffb0)
    
    Since the check is just for non-zero, split it to be two 32 bit accesses
    (preserving speed in the fast path) and do a get_unaligned() in the slow path.
    
    This is a modification of a wholly get_unaligned patch submitted by Paul Guo
    Reported-by: default avatarPaul Guo <ggang@tilera.com>
    Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
    53a983c4
mv_sas.h 13.5 KB