- C 91.1%
- Shell 5.5%
- Makefile 3.4%
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priv->skb holds the tx skb between snull_tx() handing it off and the matching SNULL_TX_INTR being processed. Normally that window closes synchronously within the same snull_hw_tx() call, so it never survives until teardown. But when the lockup simulation fires, snull_hw_tx() deliberately skips calling snull_interrupt() and just stops the queue instead. priv->skb is left pending, to be freed later by the interrupt that snull_tx_timeout() fires once the watchdog trips. If snull_cleanup() (rmmod) runs in that window, before the watchdog has fired, nothing ever frees priv->skb and it leaks permanently. This is only safe now that snull_regular_interrupt() guards its dev_kfree_skb(priv->skb) call and zeroes the pointer afterward. Without that fix priv->skb would be a dangling non-NULL pointer left over from the last processed TX_INTR, and this would double-free on every normal teardown. |
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| include | ||
| lddbus | ||
| misc-modules | ||
| misc-progs | ||
| pci | ||
| sbull | ||
| scull | ||
| scull-shared | ||
| scullc | ||
| sculld | ||
| scullp | ||
| scullv | ||
| short | ||
| shortprint | ||
| simple | ||
| skull | ||
| snull | ||
| tty | ||
| usb | ||
| .cproject | ||
| .gitignore | ||
| .project | ||
| init | ||
| LICENSE | ||
| Makefile | ||
| README.Debian | ||
| README.md | ||
ldd3: Linux Device Drivers 3 examples updated to work with recent kernels
About
Linux Device Drivers 3 (http://lwn.net/Kernel/LDD3/) book is now a few years old and most of the example drivers do not compile in recent kernels.
This project aims to keep LDD3 example drivers up-to-date with recent kernels.
The original code can be found at: http://examples.oreilly.com/9780596005900/
Compiling
The example drivers should compile against latest Linus Torvalds kernel tree:
- git://git.kernel.org/pub/scm/linux/kernel/git/sfr/linux-next.git
To compile the drivers against a specific tree (for example Linus tree):
$ git clone git://github.com/martinezjavier/ldd3.git
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ export KERNELDIR=/path/to/linux
$ cd ldd3
$ make
Bugs, comments or patches: See https://github.com/martinezjavier/ldd3/issues
Latest Tested Kernel Builds
The kernel builds below are the versions most recently tested/supported
- Ubuntu 18.04 kernel as of July 2020: 5.4.0-42-generic
- Ubuntu 20.04 kernel as of July 2021: 5.4.0-73-generic
- Yocto poky warrior branch kernel for qemu aarch64 builds: 5.0.19
- Yocto poky hardknott branch kernel for qemu aarch64 builds: 5.10.46
- Buildroot 2019.05 kernel for qemu builds: 4.9.16
- Buildroot 2021.02 kernel for qemu builds: 5.10
- Alpine 3.13 kernel as of May 2021: 5.10.29-lts, see here for detail.
Eclipse Integration
---------4 Eclipse CDT integration is provided by symlinking the correct linux source directory with the ./linux_source_cdt symlink. The .project and .cproject files were setup using instructions in this link and assuming a symlink is setup in the local project directory to point to relevant kernel headers
This can be done on a system with kernel headers installed using:
ln -s /usr/src/linux-headers-`uname -r`/ linux_source_cdt