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When many devices share the same iova domain, iommu_dma_init_domain() may be called at the same time. The checking of iovad->start_pfn will all get false in iommu_dma_init_domain() and both enter init_iova_domain() to do iovad initialization. Fix this by protecting init_iova_domain() with iommu_dma_cookie->mutex. Exception backtrace: rb_insert_color(param1=0xFFFFFF80CD2BDB40, param3=1) + 64 init_iova_domain() + 180 iommu_setup_dma_ops() + 260 arch_setup_dma_ops() + 132 of_dma_configure_id() + 468 platform_dma_configure() + 32 really_probe() + 1168 driver_probe_device() + 268 __device_attach_driver() + 524 __device_attach() + 524 bus_probe_device() + 64 deferred_probe_work_func() + 260 process_one_work() + 580 worker_thread() + 1076 kthread() + 332 ret_from_fork() + 16 Signed-off-by: Ning Li <ning.li@mediatek.com> Signed-off-by: Yunfei Wang <yf.wang@mediatek.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Miles Chen <miles.chen@mediatek.com> Link: https://lore.kernel.org/r/20220530120748.31733-1-yf.wang@mediatek.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.