Matthew N. Dodd a50519ed08 Handle PIO timeouts in ata_end_transaction() by immediately returning.
Failure to do this will result in following ata_pio_read() calls walking
off the end of the read buffer.

This resolves the "memory modified after free" panics common with Thinkpads
and CD/DVD drives.

Submitted by:	 Nate Lawson <nate AT root.org>
2005-03-02 03:59:28 +00:00
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