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| author | Dmitriy Vyukov <dvyukov@google.com> | 2015-09-08 10:52:44 +0200 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2015-12-12 23:09:48 -0800 |
| commit | 9eab46b7cb8d0b0dcf014bf7b25e0e72b9e4d929 (patch) | |
| tree | 33d44739cb702dddf3d371285c3ff4b24f134c7e /drivers/net/ethernet/intel/igb/igb.h | |
| parent | 18f7ce5412027232890143ccfae23668d0872d27 (diff) | |
| download | lwn-9eab46b7cb8d0b0dcf014bf7b25e0e72b9e4d929.tar.gz lwn-9eab46b7cb8d0b0dcf014bf7b25e0e72b9e4d929.zip | |
e1000: fix data race between tx_ring->next_to_clean
e1000_clean_tx_irq cleans buffers and sets tx_ring->next_to_clean,
then e1000_xmit_frame reuses the cleaned buffers. But there are no
memory barriers when buffers gets recycled, so the recycled buffers
can be corrupted.
Use smp_store_release to update tx_ring->next_to_clean and
smp_load_acquire to read tx_ring->next_to_clean to properly
hand off buffers from e1000_clean_tx_irq to e1000_xmit_frame.
The data race was found with KernelThreadSanitizer (KTSAN).
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/igb/igb.h')
0 files changed, 0 insertions, 0 deletions