[Bug 833] New: modprobe usb-storage fails due to kernel thread doing funny stuff...

bugzilla at busybox.net bugzilla at busybox.net
Wed Dec 30 09:13:37 UTC 2009


           Summary: modprobe usb-storage fails due to kernel thread doing
                    funny stuff...
           Product: Busybox
           Version: 1.15.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: busybox at misc.lka.org.lu
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0

modprobe usb-storage fails with a "Module already exists" error with 2.6.32.

The following seems to happen:

usb-storage depends on usb-libusual, so modprobe schedules first an insmod
usb-libusual, and then usb-storage.

However, the kernel does funny stuff in usb-libusual's init, and spawns a
thread to do "modprobe -q -- usb-storage". Usually, this thread wins the race,
and usb-storage will already be present before the outer modprobe gets around
to inserting it. With the result that it gets an error, because the module
already exists.

It's more than a cosmetic problem, because this makes modprobing anything that
depends on usb-storage impossible (such as ums-cypress)

The attached patch fixes the issue by ignoring EEXIST in do_modprobe

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