Messages in this thread | | | Date | Wed, 08 Sep 1999 22:35:52 -0700 | From | Brian Macy <> | Subject | Re: BusLogic + SMP == broke |
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Stephen Frost wrote: > > Get any funny kernel errors on the screen when these locks happened? > I've got a BT958D in an SMP machine, and basically every day, damn near EVERY > day, it'll lock on me w/ a message bitching about a scsi error or something, > I'd have to go look it up again...
Not so lucky... what happens nearly every time: - Do a preview scan (xsane, net SANE, or xscanimage) - Do a scan at 300dpi - Stops part way into the scan and the app doing the scanning locks - About 30seconds later the entire machine locks solid, no message, no anything
From looking at the driver, it isn't doing proper locking. The only thing using spinlocks is the ISR itself... which is of little use since the other side of the command queue'ing isn't locked. There are stubs for non-ISR locks but the function are NOPs. If you do make the functions call spinlocks the driver locks up on detection (my guess is deadlocking on the spinlock). I'm not sure this is the real problem as I'd expect kernel oops over poor resource contention.
I figured I'd take Doug's suggestion and look at the aic7xxx driver and see if I can figure out how I can use it as a model to rewrite the BusLogic driver... or I may look at the new Mylex DAC960 driver since it uses a similar model but appears to at least attempt to use proper locking. Driver writing is pretty new to me so I may just break-down, give up, and get a new card.
BTW you wouldn't happen to have a Tyan motherboard would you?
Brian Macy
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