Re: Regression in suspend to ram in 2.6.31-rc kernels
From: Pavel Machek
Date: Fri Sep 11 2009 - 16:10:57 EST
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Um..., sorry, I'm not sure what are you talking about. Of course, the
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problem of this is that system freeze on suspend.
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Or are you asking my guess of the cause, or something? If so, although
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I'm not reading all emails on this thread, from Zdenek's backtrace, the
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sequence would be
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1) suspend mmc
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2) mmc generates card removed event
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3) prepare to invalidate blockdev
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4) sync fs on invalidating blockdev
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5) flush buffers on invalidating blockdev (partitions)
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6) delete blockdev (partitions)
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or like the above. And I can guess some possible issues/root-cause we
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have to handle from it.
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a) card removed event from mmc for suspend is right design?
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b) the card can be changed/removed before system was resumed, mmc
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can be detect/handle it properly?
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c) flushing buffers on _deleted_ device is right design?
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and I suspect there are more issues in detail and resume process though.
I guess c) is main problem. If device is not there, how do you want to
flush buffers on it?
Pavel
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