On Mon, May 19, 2014 at 05:08:56PM +0200, Bart Van Assche wrote: > On 05/19/14 16:08, Paolo Bonzini wrote: > > 2) reentrancy: the softirq handler and scmd_eh_abort_handler can run > > concurrently, and call scsi_finish_command without any lock protecting > > the calls. You can then get memory corruption. > > I'm not sure what the recommended approach is to address this race. But > it is possible to address this in the LLD. See e.g. the srp_claim_req() > function in the SRP LLD and how it is invoked from the reply handler, > the abort handler and the reset handlers in that LLD.
blk-mq triest to solve this a test_and_set_bit for a completion flag at the block layer for completions vs timeouts. I think doing this in the SCSI layer as well would be very useful as we can't expect Joe Random Driver Developer to get it right in every driver. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
