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c9358de193
The hfi1 user SDMA pinned-page cache will leave a stale cache entry when the cache-entry's virtual address range is invalidated but that cache entry is in-use by an outstanding SDMA request. Subsequent user SDMA requests with buffers in or spanning the virtual address range of the stale cache entry will result in packets constructed from the wrong memory, the physical pages pointed to by the stale cache entry. To fix this, remove mmu_rb_node cache entries from the mmu_rb_handler cache independent of the cache entry's refcount. Add 'struct kref refcount' to struct mmu_rb_node and manage mmu_rb_node lifetime with kref_get() and kref_put(). mmu_rb_node.refcount makes sdma_mmu_node.refcount redundant. Remove 'atomic_t refcount' from struct sdma_mmu_node and change sdma_mmu_node code to use mmu_rb_node.refcount. Move the mmu_rb_handler destructor call after a wait-for-SDMA-request-completion call so mmu_rb_nodes that need mmu_rb_handler's workqueue to queue themselves up for destruction from an interrupt context may do so. Fixes: |
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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.