Testing for regressions in Media Controller API register, ioctl, syscall, and unregister paths. There have a few problems that result in user-after free on media_device, media_devnode, and cdev pointers when the driver is unbound while ioctl is in progress. Test Procedure: Run bin/unbind loop while ioctls are in progress. Run rmmod and modprobe. Disconnect the device. Setup: Build media_device_test cd tools/testing/selftests/media_tests make Regressions test for cdev user-after free error on /dev/mediaX when driver is unbound: Start media_device_test to regression test media devnode dynamic alloc and cdev user-after-free fixes. This opens media dev files and sits in a loop running media ioctl MEDIA_IOC_DEVICE_INFO command once every 10 seconds. The idea is when device file goes away, media devnode and cdev should stick around until this test exits. The test for a random number of iterations or until user kills it with a sleep 10 in between the ioctl calls. sudo ./media_device_test -d /dev/mediaX Regression test for media_devnode unregister race with ioctl_syscall: Start 6 open_loop_test.sh tests with different /dev/mediaX files. When device file goes away after unbind, device file name changes. Start the test with possible device names. If we start with /dev/media0 for example, after unbind, /dev/media1 or /dev/media2 could get created. The idea is keep ioctls going while bind/unbind runs. Copy bind_unbind_sample.txt and make changes to specify the driver name and number to run bind and unbind. Start the bind_unbind.sh Run dmesg looking for any user-after free errors or mutex lock errors. it.cgi/linux/net-next.git/log/tools/usb/ffs-aio-example'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/tools/usb/ffs-aio-example?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/tools/usb/ffs-aio-example?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/usb/ffs-aio-example?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/usb/ffs-aio-example'> <input type='hidden' name='id' value='5f155c2563592b1908a7df2dcbd44893fde3e419'/><select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/usb?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/usb/ffs-aio-example?id=5f155c2563592b1908a7df2dcbd44893fde3e419'>ffs-aio-example</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/usb/ffs-aio-example?id=5f155c2563592b1908a7df2dcbd44893fde3e419&showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>