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6f301e06de
The following sequence: * Change queue pair state into IB_QPS_ERR. * Post a work request on the queue pair. Triggers the following race condition in the rdma_rxe driver: * rxe_qp_error() triggers an asynchronous call of rxe_completer(), the function that examines the QP send queue. * rxe_post_send() posts a work request on the QP send queue. If rxe_completer() runs prior to rxe_post_send(), it will drain the send queue and the driver will assume no further action is necessary. However, once we post the send to the send queue, because the queue is in error, no send completion will ever happen and the send will get stuck. In order to process the send, we need to make sure that rxe_completer() gets run after a send is posted to a queue pair in an error state. This patch ensures that happens. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Moni Shoua <monis@mellanox.com> Cc: <stable@vger.kernel.org> # v4.8 Signed-off-by: Doug Ledford <dledford@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.