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authorTejun Heo <tj@kernel.org>2009-04-28 12:38:33 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 20:24:20 +0200
commit0191944282e84931f92915b5f06b348a92dac7e1 (patch)
tree5459927f8545c1a666913ee327c4f25c6994c6eb /fs
parent0d9f346fb0cd6d6fc70827c5396a0d83939530e4 (diff)
hd: fix locking
hd dance around local irq and HD_IRQ enable without achieving much. It ends up transferring data from irq handler with both local irq and HD_IRQ disabled. The only place it actually does something is while transferring the first block of a request which it does with HD_IRQ disabled but local irq enabled. Unfortunately, the dancing is horribly broken from locking POV. IRQ and timeout handlers access block queue without grabbing the queue lock and running the driver in SMP configuration crashes the whole machine pretty quickly. Remove meaningless irq enable/disable dancing and add proper locking in issue, irq and timeout paths. Signed-off-by: Tejun Heo <tj@kernel.org>
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