On Friday 12 July 2013 13:09:23 WangChen wrote:
> Oliver, my understanding is the limit_sem will only cause write() to sleep
> and wait for other IOs to finish when there are alreay WRITES_IN_FLIGHT URBs
> are on going. I see code line 509: sema_init(&dev->limit_sem,
> WRITES_IN_FLIGHT);
> My understanding of Blocking IO should block every write() when corresponding
> URBs is not finished, am I right?
Well, no. For a disk explicitly not and for a character device there's
no need to be different.
Regards
Oliver
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