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authorPaolo Bonzini <pbonzini@redhat.com>2011-09-16 16:40:02 +0200
committerKevin Wolf <kwolf@redhat.com>2011-09-20 12:27:43 +0200
commitc3adb5b9168a57790b5074489b6f0275ac3cc8b5 (patch)
tree23c80fd5ded017fea0c0cde44673872498e80c83 /qerror.h
parent10dc8aef419b4ce77670fb080ffe995bf9d7b0a1 (diff)
dma-helpers: rewrite completion/cancellation
This fixes various problems with completion/cancellation: * if the io_func fails to get an AIOCB, the callback wasn't called * If DMA encounters a bounce buffer conflict, and the DMA operation is canceled before the bottom half fires, bad things happen. * memory is not unmapped after cancellation, again causing problems when doing DMA to I/O areas * cancellation could leak the iovec * the callback was missed if the I/O operation failed without returning an AIOCB and probably more that I've missed. The patch fixes them by sharing the cleanup code between completion and cancellation. The dma_bdrv_cb now returns a boolean completed/not completed flag, and the wrapper dma_continue takes care of tasks to do upon completion. Most of these are basically impossible in practice, but it is better to be tidy... Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qerror.h')
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