tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests: add media controller regression test scripts and document
Add regression test scripts open_loop_test.sh, and bind_unbind_sample.sh.
Also add regression_test.txt that describes the regression test procedure.
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
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tools/testing/selftests/media_tests/bind_unbind_sample.sh
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tools/testing/selftests/media_tests/bind_unbind_sample.sh
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#!/bin/bash
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# Find device number in /sys/bus/usb/drivers/drivername
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# Edit this file to update the driver numer and name
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# Example test for uvcvideo driver
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#i=0
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# while :; do
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# i=$((i+1))
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# echo 1-5:1.0 > /sys/bus/usb/drivers/uvcvideo/unbind;
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# echo 1-5:1.0 > /sys/bus/usb/drivers/uvcvideo/bind;
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# clear
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# echo $i
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#done
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tools/testing/selftests/media_tests/open_loop_test.sh
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tools/testing/selftests/media_tests/open_loop_test.sh
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tools/testing/selftests/media_tests/regression_test.txt
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tools/testing/selftests/media_tests/regression_test.txt
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Testing for regressions in Media Controller API register, ioctl, syscall,
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and unregister paths. There have a few problems that result in user-after
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free on media_device, media_devnode, and cdev pointers when the driver is
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unbound while ioctl is in progress.
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Test Procedure:
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Run bin/unbind loop while ioctls are in progress.
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Run rmmod and modprobe.
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Disconnect the device.
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Setup:
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Build media_device_test
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cd tools/testing/selftests/media_tests
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make
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Regressions test for cdev user-after free error on /dev/mediaX when driver
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is unbound:
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Start media_device_test to regression test media devnode dynamic alloc
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and cdev user-after-free fixes. This opens media dev files and sits in
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a loop running media ioctl MEDIA_IOC_DEVICE_INFO command once every 10
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seconds. The idea is when device file goes away, media devnode and cdev
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should stick around until this test exits.
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The test for a random number of iterations or until user kills it with a
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sleep 10 in between the ioctl calls.
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sudo ./media_device_test -d /dev/mediaX
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Regression test for media_devnode unregister race with ioctl_syscall:
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Start 6 open_loop_test.sh tests with different /dev/mediaX files. When
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device file goes away after unbind, device file name changes. Start the
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test with possible device names. If we start with /dev/media0 for example,
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after unbind, /dev/media1 or /dev/media2 could get created. The idea is
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keep ioctls going while bind/unbind runs.
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Copy bind_unbind_sample.txt and make changes to specify the driver name
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and number to run bind and unbind. Start the bind_unbind.sh
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Run dmesg looking for any user-after free errors or mutex lock errors.