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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-12-12 12:42:12 +0100
committerJens Axboe <axboe@kernel.dk>2011-12-12 12:42:12 +0100
commitb302545744c031eae04a43fb1c56cc17e00a193a (patch)
tree6d72f21f033d5e2e1589dada45b767a0327e45d0 /block
parentdfaf3c036cd46a73f4ef3e4b75c1f647e503d4e1 (diff)
block/swim3: Locking fixes
The old PowerMac swim3 driver has some "interesting" locking issues, using a private lock and failing to lock the queue before completing requests, which triggered WARN_ONs among others. This rips out the private lock, makes everything operate under the block queue lock, and generally makes things simpler. We used to also share a queue between the two possible instances which was problematic since we might pick the wrong controller in some cases, so make the queue and the current request per-instance and use queuedata to point to our private data which is a lot cleaner. We still share the queue lock but then, it's nearly impossible to actually use 2 swim3's simultaneously: one would need to have a Wallstreet PowerBook, the only machine afaik with two of these on the motherboard, and populate both hotswap bays with a floppy drive (the machine ships only with one), so nobody cares... While at it, add a little fix to clear up stale interrupts when loading the driver or plugging a floppy drive in a bay. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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