Il 19/05/2014 17:08, Bart Van Assche ha scritto:
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.
That's not enough, unless I'm missing something. Say the request
handler claims the request and the abort handler doesn't:
- the request handler calls scsi_done and ends up in scsi_finish_command.
- the abort handler will return SUCCESS, and scmd_eh_abort_handler then
calls scsi_finish_command.
Paolo
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