Re: [PATCH #upstream-fixes] libata: disable ATAPI AN by default

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On 15:38 Wed 19 May     , Tejun Heo wrote:
> There are ATAPI devices which raise AN when hit by commands issued by
> open().  This leads to infinite loop of AN -> MEDIA_CHANGE uevent ->
> udev open() to check media -> AN.
> 
> Both ACS and SerialATA standards don't define in which case ATAPI
> devices are supposed to raise or not raise AN.  They both list media
> insertion event as a possible use case for ATAPI ANs but there is no
> clear description of what constitutes such events.  As such, it seems
> a bit too naive to export ANs directly to userland as MEDIA_CHANGE
> events without further verification (which should behave similarly to
> windows as it apparently is the only thing that some hardware vendors
> are testing against).
> 
> This patch adds libata.atapi_an module parameter and disables ATAPI AN
> by default for now.

Works here, drive now spins down properly.

Tested-By: Nick Bowler <nbowler@xxxxxxxxxx>

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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