SOLVED: autoloading sg driver during boot

[Paul Howarth]

Aleksandar Milivojevic wrote:
> Aleksandar Milivojevic wrote:
> 
>> Probably something trivial, but can't seem to find solution (other 
>> than placing "modprobe sg" in /etc/rc.local).
>>
>> I attempted something like this in modprobe.conf:
>>
>> alias char-major-21 sg
>>
>> (and also char-major-21-* variant)
>>
>> The problem is, there are no /dev/sg* entries in /dev when machine 
>> boots.  They are created by udev when "sg" driver loads.  Chicken and 
>> egg problem.  Kind of.  So the above lien in modprobe.conf does not 
>> really work.
>>
>> So....  the question is, is there any way to instruct udev to create 
>> /dev/sg* nodes (so that applications can access it and trigger auto 
>> loading of sg driver)?  Or instruct system to autoload sg module 
>> during boot if there are any SCSI devices, which would trigger udev to 
>> create /dev/sg* nodes?  Other than placing "modprobe sg" in 
>> /etc/rc.local.
> 
> 
> Problem solved.  In short, I had a buggy version of hotplug package 
> installed.
> 
> The fix is simple.  What needs to be done is to edit 
> /etc/hotplug/scsi.agent script.  It checks the device type and loads 
> appropriate driver.  The stock Fedora script does not load any drivers 
> for type 8 (changer) device, and the one I have (taken from RHEL 4) had 
> a typo in the line for changer device.
> 
> Near the end of the script is a case statement that selects appropriate 
> driver depending on numeric SCSI device type (as return by device when 
> it is queried).  The stock Fedora script has a line for changer device 
> empty (does not load any driver):
> 
>    8)          TYPE=changer ;;
> 
> And the script from RHEL 4 has a typo (note misspelled word moudle -> 
> module):
> 
>    8)          TYPE=changer ; MOUDLE = sg ;;
> 
> It should read:
> 
>    8)          TYPE=changer ; MODULE = sg ;;
> 
> As soon as I fixed it, everything works OK, and sg module is 
> automatically loaded during boot (by hotplug subsystem), and udev 
> creates appropriate device nodes automagically (as it is supposed to 
> do).  Weehee...

Looks like:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=151534

Might be worth trying the rawhide version of hotplug to see if it fixes 
the problem, as claimed, or whether the same typo has been made.

Paul.