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f605f26ea1
Currently the rxe driver makes little effort to make the changes to qp state (which includes qp->attr.qp_state, qp->attr.sq_draining and qp->valid) atomic between different client threads and IO threads. In particular a common template is for an RDMA application to call ib_modify_qp() to move a qp to ERR state and then wait until all the packet and work queues have drained before calling ib_destroy_qp(). None of these state changes are protected by locks to assure that the changes are executed atomically and that memory barriers are included. This has been observed to lead to incorrect behavior around qp cleanup. This patch continues the work of the previous patches in this series and adds locking code around qp state changes and lookups. Link: https://lore.kernel.org/r/20230405042611.6467-5-rpearsonhpe@gmail.com Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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.