Fix two device-unregistration lifecycle bugs in devmem TCP bindings and add netdevsim support plus selftests covering both RX and TX device unregistration:
1. net: devmem: unmap dma_buf synchronously on queue uninstall Synchronously unmap and detach binding->attachment under binding->lock when the last RX queue is uninstalled in mp_dmabuf_devmem_uninstall(), preventing slab-use-after-free in dma_unmap_sg_attrs() when the netlink socket closes after dma_dev is freed. 2. net: devmem: detach TX bindings on NETDEV_UNREGISTER Add net_devmem_dev_unregister() on NETDEV_UNREGISTER to fully detach and unmap TX bindings when binding->dev unregisters, or clear binding->vdev alone when only a virtual device unregisters while binding->dev lives. 3. netdevsim: support devmem RX and TX bindings Enable PP_FLAG_DMA_MAP | PP_FLAG_ALLOW_UNREADABLE_NETMEM, 64-bit DMA mask on nsim_bus_dev, and NETMEM_TX_DMA on netdevsim so devmem RX/TX bindings can be exercised in software selftests. 4. selftests: net: add devmem RX and TX netdev unregister tests Add devmem_bind_rx_unregister_check and devmem_bind_tx_unregister_check to tools/testing/selftests/net/nl_netdev.py. Cc: Tariq Toukan <[email protected]> Cc: Kaifeng Wang <[email protected]> Mina Almasry (4): net: devmem: unmap dma_buf synchronously on queue uninstall net: devmem: detach TX bindings on NETDEV_UNREGISTER netdevsim: support devmem RX and TX bindings selftests: net: add devmem RX and TX netdev unregister tests drivers/net/netdevsim/bus.c | 1 + drivers/net/netdevsim/netdev.c | 21 +++-- net/core/devmem.c | 68 +++++++++++++- net/core/devmem.h | 5 ++ net/core/netdev-genl.c | 1 + tools/testing/selftests/net/nl_netdev.py | 108 ++++++++++++++++++++++- 6 files changed, 192 insertions(+), 12 deletions(-) base-commit: af32da41b0327b9c6a37856ba82b6760d6c8d10e -- 2.56.0.385.gd3acb90ef8-goog
