staging/rdma/hfi1: don't cache "prescan head"

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When HFI1_CAP_DMA_RTAIL is toggled off the "prescan head" can get out of sync
with the receive context's "head". This happens when, after prescan_rxq() newly
arrived packets are then received, and processed by an RX interrupt handler.
This is an unavoidable race, and to avoid getting out of sync we always start
prescanning at the current "rcd->head" entry.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Arthur Kepner <arthur.kepner@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Arthur Kepner 2015-11-04 21:10:09 -05:00 • committed by Greg Kroah-Hartman

parent 701e441d82

commit 3e7ccca08d

2 changed files with 3 additions and 23 deletions

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13

drivers/staging/rdma/hfi1/driver.c

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13

drivers/staging/rdma/hfi1/hfi.h

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