On Fri, Jan 15, 2010 at 10:03:09AM +0100, Stefan Richter wrote: > On 15 Jan, Jens Axboe wrote: > > On Fri, Jan 15 2010, Stefan Richter wrote: > >> The sg driver's open method takes a reference to the underlying SCSI > >> device representation of the mid layer. Among else, this step increases > >> the module use count of the respective low-level driver > ... > >> In short, it is normal, expected, and necessary what you are seeing. > > > > Hmm... Unless I'm reading Stephens email incorrectly, he's holding the > > device open, removing it, closing the device, and then attempting to > > remove the host driver. So at the point that he wants to rmmod the > > module, there is indeed no references to it anymore. > > > > It looks like a bug. > > Oh, right, I missed that the device file was indeed closed ( = the > seemingly last user of it exited) before rmmod was attempted. > > I.e. remove-single-device while an sg file is open leaves a dangling > reference, while remove-single-device while an sd file is open does > not... > -- > Stefan Richter > -=====-==-=- ---= -==== > http://arcgraph.de/sr/ > I've since tried this on a newer kernel, 2.6.33rc4 (previously I was using a 2.6.27 kernel). With the 2.6.33rc4 kernel, so far the problem hasn't appeared. Thanks, and sorry I didn't try the newer kernel first. -- steve -- 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
