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Hi, Alan Cox wrote: > disable_irq only blocks _one_ interrupt line, spin_lock_irqsave locks the > interrupt off on a uniprocessor, and 50% of the time off on a > dual processor. > > If I use a spin lock you can't run a modem and an NE2000 card together on > Linux 2.4. Thats why I had to do that work on the code. Its one of myriads > of basic obvious cases that the pre-empt patch gets wrong I wouldn't say it gets it wrong, the driver also has to take a non irq spinlock anyway, so the window is quite small and even then the packet is only delayed. But now I really have to look at that driver and try a more optimistic irq disabling approach, otherwise it will happily disable the most important shared interrupt on my Amiga for ages. bye, Roman - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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