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| author | Brian King <brking@linux.vnet.ibm.com> | 2017-11-17 11:05:47 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:35:52 +0000 |
| commit | 5f068a6634761bf1d732a1173305faf92fecbe1f (patch) | |
| tree | 596f38ed9fc427353b0ee2e79fb5db81a931a66a /drivers | |
| parent | f4e3b96ba8ba8404e504632aa780f225363596dd (diff) | |
| download | linux-stable-5f068a6634761bf1d732a1173305faf92fecbe1f.tar.gz linux-stable-5f068a6634761bf1d732a1173305faf92fecbe1f.tar.bz2 linux-stable-5f068a6634761bf1d732a1173305faf92fecbe1f.zip | |
igb: Use smp_rmb rather than read_barrier_depends
commit c4cb99185b4cc96c0a1c70104dc21ae14d7e7f28 upstream.
The original issue being fixed in this patch was seen with the ixgbe
driver, but the same issue exists with igb as well, as the code is
very similar. read_barrier_depends is not sufficient to ensure
loads following it are not speculatively loaded out of order
by the CPU, which can result in stale data being loaded, causing
potential system crashes.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 21d868e287df..2ba73fc6d328 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6383,7 +6383,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector) break; /* prevent any other reads prior to eop_desc */ - read_barrier_depends(); + smp_rmb(); /* if DD is not set pending work has not been completed */ if (!(eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD))) |