Do Hak Yong <crazyraven@xxxxxxxxx> writes: > Hello kernel experts, > > I have a few questions about the priority of kernel drivers and third party > drivers. > > If I install a third party vendor driver, which has the same module name as > kernel provides, for example, Qlogic driver has the same module name as > third party driver(qla2xxx). > > The questions are: > > Q1. Which driver has higher priority and which driver will be used? will > there any be problems? See depmod.d(5). Unless overridden by config, modules in /lib/modules/$(uname -r)/updates have priority over other modules. This can be used to replace kernel modules with a third party driver. The third party driver could also use a startup script to forcibly replace already loaded modules. > Q2. How to control which driver the os will use? If the file names are identical, then use the "updates" directory or configure another location to have priority over the kernel modules. If the file names are different, then you can blacklist the kernel module to make sure the third party module is the only one available for auto-loading. See modprobe.d(5) > Q3. What if the updated kernel installed and provied higher driver version > than third party? Which one will be used then? The default is to consider only the modules in /lib/modules/$(uname -r) Any third party module must be updated along with the kerne. Or copied into the new location if binary compatible. But that's not likely in general. > I think third party drivers have more precedence that kernel drivers refer > to below Red Hat KB, but I'm not sure which one will be used when the > kernel has updated. > > https://access.redhat.com/solutions/176213 Redhat uses a more complex depmod configuration than default. You should probably ask them about their setup. Or just look at the config in /etc/depmod.d/*.conf Bjørn _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
