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[ Upstream commitca0c448d2b] The struct rdma_id_private contains three bit-fields, tos_set, timeout_set, and min_rnr_timer_set. These are set by accessor functions without any synchronization. If two or all accessor functions are invoked in close proximity in time, there will be Read-Modify-Write from several contexts to the same variable, and the result will be intermittent. Fixed by protecting the bit-fields by the qp_mutex in the accessor functions. The consumer of timeout_set and min_rnr_timer_set is in rdma_init_qp_attr(), which is called with qp_mutex held for connected QPs. Explicit locking is added for the consumers of tos and tos_set. This commit depends on ("RDMA/cma: Remove unnecessary INIT->INIT transition"), since the call to rdma_init_qp_attr() from cma_init_conn_qp() does not hold the qp_mutex. Fixes:2c1619edef("IB/cma: Define option to set ack timeout and pack tos_set") Fixes:3aeffc46af("IB/cma: Introduce rdma_set_min_rnr_timer()") Link: https://lore.kernel.org/r/1624369197-24578-3-git-send-email-haakon.bugge@oracle.com Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.