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On Sat, Dec 28, 2013 at 12:00 PM, <[email protected]>wrote: > Send Kernelnewbies mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Kernelnewbies digest..." > > > Today's Topics: > > 1. Re: Can't cleanly unload driver ([email protected]) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 28 Dec 2013 00:13:08 -0500 > From: [email protected] > Subject: Re: Can't cleanly unload driver > To: Eric Fowler <[email protected]> > Cc: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > On Fri, 27 Dec 2013 19:33:50 -0800, Eric Fowler said: > > > I suspect I am doing something wrong in the code with > > register/unregister_chrdev(), but I have been over that code a million > > times. It looks fine. > > > > Now: > > insmod the device, OK > > rmmod the device, OK > > Check /proc/devices , device # is present > > insmod the device again, fails with ERROR: could not insert module > > ./foobar.ko: Device or resource busy > > It does smell like an unregister issue. You may want to try adding > printk() calls to print out the return code from register and unregister. > I'm willing to bet that (a) the unegister is failing because somebody > still has a reference on the device, and (b) the second register call fails > because the device already exists, causing your module_init() to bail out. > > The fun is that you may not have taken a reference on the device directly > yourself - you may have called some other get_foo() that ends up taking an > implicit reference under the covers, causing issues when you fail to call > put_foo() at the right place... > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: not available > Type: application/pgp-signature > Size: 848 bytes > Desc: not available > Url : > http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20131228/292e4d34/attachment-0001.bin > > ------------------------------ > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > End of Kernelnewbies Digest, Vol 37, Issue 37 > ********************************************* >
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