https://community.hpe.com/t5/operating-system-hp-ux/disable-autoload-dlkm-module/m-p/4529536#M368073 Hi,<BR /><BR />I have written a simple kernel module "mymod". and mknod a special file "/dev/mymod_ctl".<BR />Here is what I do:<BR /><BR />1. kmadmin -L mymod =&gt; module gets loaded<BR />2. kmadmin -U mymod =&gt; module gets unloaded<BR />3. dd if=/dev/mymod_ctl of=/dev/null count=1 =&gt; module gets loaded again by itself<BR />4. kmadmin -U mymod =&gt; "Device busy" module unload fails<BR /><BR />note that /dev/mymod_ctl has minor number 0 and mymod_open() and mymod_close() just return 0 if minor number is 0<BR /><BR />What I want to know is that What is happening in steps 3 and 4 which is different than 1 and 2 as far as module loading/unloading is concerned?<BR /><BR />How can I avoid autoloading mymod in step 3. <BR /><BR />Please help!! Sat, 07 Nov 2009 00:03:39 GMT Ashes 2009-11-07T00:03:39Z https://community.hpe.com/t5/operating-system-hp-ux/disable-autoload-dlkm-module/m-p/4529536#M368073 Hi,<BR /><BR />I have written a simple kernel module "mymod". and mknod a special file "/dev/mymod_ctl".<BR />Here is what I do:<BR /><BR />1. kmadmin -L mymod =&gt; module gets loaded<BR />2. kmadmin -U mymod =&gt; module gets unloaded<BR />3. dd if=/dev/mymod_ctl of=/dev/null count=1 =&gt; module gets loaded again by itself<BR />4. kmadmin -U mymod =&gt; "Device busy" module unload fails<BR /><BR />note that /dev/mymod_ctl has minor number 0 and mymod_open() and mymod_close() just return 0 if minor number is 0<BR /><BR />What I want to know is that What is happening in steps 3 and 4 which is different than 1 and 2 as far as module loading/unloading is concerned?<BR /><BR />How can I avoid autoloading mymod in step 3. <BR /><BR />Please help!! Sat, 07 Nov 2009 00:03:39 GMT https://community.hpe.com/t5/operating-system-hp-ux/disable-autoload-dlkm-module/m-p/4529536#M368073 Ashes 2009-11-07T00:03:39Z