Re: [PATCH 2/2 v4] libata: Implement disk shock protection support

[Tejun Heo]

Elias Oltmanns wrote:
> On user request (through sysfs), the IDLE IMMEDIATE command with UNLOAD
> FEATURE as specified in ATA-7 is issued to the device and processing of
> the request queue is stopped thereafter until the specified timeout
> expires or user space asks to resume normal operation. This is supposed
> to prevent the heads of a hard drive from accidentally crashing onto the
> platter when a heavy shock is anticipated (like a falling laptop
> expected to hit the floor). In fact, the whole port stops processing
> commands until the timeout has expired in order to avoid any resets due
> to failed commands on another device.
> 
> Signed-off-by: Elias Oltmanns <eo@xxxxxxxxxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

As for completion, yes, I think it would be nice to update complete
such that multiple complete_all() calls don't overflow and completion
can be used for this type of usage.  Anyways, that's for another day I
guess.

Thanks.

-- 
tejun
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