]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
net: octeon: mgmt: Repair filling of RX ring
authorAlexander Sverdlin <alexander.sverdlin@nokia.com>
Fri, 29 May 2020 12:17:10 +0000 (14:17 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 1 Jun 2020 18:45:20 +0000 (11:45 -0700)
commit0c34bb598c510e070160029f34efeeb217000f8d
tree3c8e9ee992e7873cce8fe19c86fede79d03a30da
parent2aec17f1997b514bc84951f99f7dae9b4b6d8b26
net: octeon: mgmt: Repair filling of RX ring

The removal of mips_swiotlb_ops exposed a problem in octeon_mgmt Ethernet
driver. mips_swiotlb_ops had an mb() after most of the operations and the
removal of the ops had broken the receive functionality of the driver.
My code inspection has shown no other places except
octeon_mgmt_rx_fill_ring() where an explicit barrier would be obviously
missing. The latter function however has to make sure that "ringing the
bell" doesn't happen before RX ring entry is really written.

The patch has been successfully tested on Octeon II.

Fixes: a999933db9ed ("MIPS: remove mips_swiotlb_ops")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/cavium/octeon/octeon_mgmt.c