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igb: Fix TX map failure path 

When the driver cannot map a TX buffer, instead of rolling back
gracefully and retrying later, we currently get a panic:

[  159.885994] igb 0000:00:00.0: TX DMA map failed
[  159.886588] Unable to handle kernel paging request at virtual address ffff00000a08c7a8
               ...
[  159.897031] PC is at igb_xmit_frame_ring+0x9c8/0xcb8

Fix the erroneous test that leads to this situation.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jean-Philippe Brucker 2017-10-19 20:07:36 +01:00 committed by Jeff Kirsher
parent 5983587c8c
commit 104ba83363
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/igb/igb_main.c
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@ -5326,7 +5326,7 @@ dma_error:
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
if (i--)
if (i-- == 0)
i += tx_ring->count;
tx_buffer = &tx_ring->tx_buffer_info[i];
}