custom ide driver causes "Badness in smp_call_function"

["Bryan Althouse" <bryan.althouse@3phoenix.com>]

Hi all,

I have added a compact flash disk onto the local bus of an rm9224 mips processor.  We are using an FPGA as an IDE host adaptor.  Our driver works great when the kernel is compiled for a single processor.  But if SMP support is enabled, the kernel dies with:

            …

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2

Ide:  Assuming 50MHz system bus speed for PIO modes; override with idebuss=xx

Badness in smp_call_function at arch/mips/kernel/smp.c:149

Call Trace:

 [<ffffffff8010aff8>] smp_call_function+0x1f8/0x200

 [<ffffffff8032adb0>] schedule+0x950/0xa08

 [<ffffffff8010b9f8>] local_rm9k_perfcounter_irq_startup+0x0/0x68

 [<ffffffff8010baa8>] rm9k_perfcounter_irq_startup+0x48/0x68

 [<ffffffff801658b8>] probe_irq_on+0x2b8/0x2e8

 [<ffffffff80146c00>] del_singleshot_timer_sync+0x38/0x50

 [<ffffffff8028e510>] try_to_identify+0x180/0x190

 [<ffffffff80147d88>] process_timeout+0x0/0x8

 [<ffffffff8028e66c>] do_probe+0x14c/0x338

 [<ffffffff8028e57c>] do_probe+0x5c/0x338

 [<ffffffff8028ec40>] wait_hwif_ready+0x178/0x180

 [<ffffffff8028f230>] probe_hwif+0x508/0x6e8

 [<ffffffff8028eec8>] probe_hwif+0x1a0/0x6e8

 [<ffffffff8028f42c>] probe_hwif_init_with_fixup+0x1c/0xe8

 [<ffffffff8029435c>] ide_3P_init+0xb4/0x118

 [<ffffffff80294324>] ide_3P_init+0x7c/0x118

 [<ffffffff8023d100>] idr_get_new+0x18/0x50

etc…

Does anyone know what sort of bug could cause problems with SMP, but would work fine otherwise?  I could supply my driver code if anyone is interested.  Thanks!

Bryan