ibmvnic: Ensure that SCRQ entry reads are correctly ordered

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Ensure that received Subordinate Command-Response Queue (SCRQ)
entries are properly read in order by the driver. These queues
are used in the ibmvnic device to process RX buffer and TX completion
descriptors. dma_rmb barriers have been added after checking for a
pending descriptor to ensure the correct descriptor entry is checked
and after reading the SCRQ descriptor to ensure the entire
descriptor is read before processing.

Fixes: 032c5e8284 ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Thomas Falcon 2020-12-01 09:52:10 -06:00 • committed by David S. Miller

parent 237f977ab9

commit b71ec95223

1 changed files with 18 additions and 0 deletions

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drivers/net/ethernet/ibm/ibmvnic.c

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