On Sat, Sep 06, 2014 at 02:49:25AM +0900, Tejun Heo wrote: > Hello, > > On Fri, Sep 05, 2014 at 09:44:05AM -0700, Dmitry Torokhov wrote: > > Which problem are we talking about here though? It does solve the slow device > > stalling the rest if the kernel booting (non-module case) for me. > > The other one. The one with timeout. Neither cxgb4 or pata_marvell > has slow probing stalling boot problem. > > > I also reject the notion that anyone should be relying on drivers to be fully > > bound on module loading. It is not nineties anymore. We have hot pluggable > > buses, deferred probing, and even for not hot-pluggable ones the module > > providing the device itself might not be yet loaded. Any scripts that expect to > > find device 100% ready after module loading are simply broken. > > We've been treating loading + probing as a single operation when > loading drivers and the assumption has always been that the existing > devices at the time of loading finished probing by the time insmod > finishes. We now need to split loading and probing and wait for each > of them differently. The *only* thing we can do is somehow making the > issuer specify that it's gonna wait for probing separately. I'm not > sure this can even be up for discussion. We're talking about a major > userland visible behavior change. I do not agree that it is actually user-visible change: generally speaking you do not really know if device is there or not. They come and go. Like I said, consider all permutations, with hot-pluggable buses, deferred probing, etc, etc. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
