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libata: revert convert-to-block-tagging patches
This patch reverts the following three commits which convert libata to use block layer tagging. 43a49cb e013e13 2fca5cc Although using block layer tagging is the right direction, due to the tight coupling among tag number, data structure allocation and hardware command slot allocation, libata doesn't work correctly with the current conversion. The biggest problem is guaranteeing that tag 0 is always used for non-NCQ commands. Due to the way blk-tag is implemented and how SCSI starts and finishes requests, such guarantee can't be made. I'm not sure whether this would actually break any low level driver but it doesn't look like a good idea to break such assumption given the frailty of ATA controllers. So, for the time being, keep using the old dumb in-libata qc allocation. Signed-off-by: Tejun Heo <[email protected]> Cc: Jens Axobe <[email protected]> Cc: Jeff Garzik <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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