STANDBY IMMEDIATE failed on NVIDIA MCP5x controllers when system suspend

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Hi all,

I've seen some reports on STANDBY IMMEDIATE failed on NVIDIA MCP5x
controllers when system goes to suspend(this command is sent by scsi sd
driver on system suspend as a SCSI STOP command, which is translated to
STANDBY IMMEDIATE ATA command). I've no idea of why this happened, so
I wrote this email in hope of getting some new idea.

The related bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=48951

And google search showed that Peter reported a similar problem here:
http://marc.info/?l=linux-ide&m=133534061316338&w=2

And bladud has found that, disable asyn suspend for the scsi target
device can work around this problem.

Please feel free to suggest what can possibly be the cause, thanks.

-Aaron

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