mvsdio: unhandled interrupt, mmc writes queuing up

[Bruno PrÃmont]

Hi,

Since upgrading my Sheevaplug from 3.7.2 to 3.13.6 (FDT) I'm seeing
  mvsdio f1090000.mvsdio: unhandled interrupt status=0x8810 en=0x0000 pio=0
at varied timings.


In addition to that, kernel seems excessively busy doing writeback via
workqueue (without success?):
[14909.275124] kworker/u2:2    R running      0  2001      2 0x00000000
[14909.275137] Workqueue: writeback bdi_writeback_workfn (flush-179:0)
[14909.275157] [<c0351df8>] (__schedule+0x180/0x38c) from [<c0034a24>] (__cond_resched+0x24/0x34)
[14909.275172] [<c0034a24>] (__cond_resched+0x24/0x34) from [<c0034a70>] (__cond_resched_lock+0x3c/0x44)
[14909.275187] [<c0034a70>] (__cond_resched_lock+0x3c/0x44) from [<c00b8a2c>] (writeback_sb_inodes+0x2b0/0x348)
[14909.275201] [<c00b8a2c>] (writeback_sb_inodes+0x2b0/0x348) from [<c00b8b34>] (__writeback_inodes_wb+0x70/0xac)
[14909.275214] [<c00b8b34>] (__writeback_inodes_wb+0x70/0xac) from [<c00b8cf0>] (wb_writeback+0x180/0x190)
[14909.275228] [<c00b8cf0>] (wb_writeback+0x180/0x190) from [<c00b91c0>] (bdi_writeback_workfn+0x144/0x324)
[14909.275243] [<c00b91c0>] (bdi_writeback_workfn+0x144/0x324) from [<c00286b8>] (process_one_work+0x104/0x358)
[14909.275258] [<c00286b8>] (process_one_work+0x104/0x358) from [<c0028ce8>] (worker_thread+0x134/0x38c)
[14909.275273] [<c0028ce8>] (worker_thread+0x134/0x38c) from [<c002dec4>] (kthread+0xb0/0xcc)
[14909.275287] [<c002dec4>] (kthread+0xb0/0xcc) from [<c0009490>] (ret_from_fork+0x14/0x24)
(eating about 50% CPU time with variations between 10% and 90%)

Dirty pages accumulate and calls to `sync` do not write those back
to storage.


Any idea what it could be and how to fix it?

I get same results with 3.14-rc7.

Bruno
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