fm10k: avoid divide by zero in rare cases when device is resetting

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It is possible that under rare circumstances the device is undergoing
a reset, such as when a PFLR occurs, and the device may be transmitting
simultaneously. In this case, we might attempt to divide by zero when
finding the proper r_idx. Instead, lets read the num_tx_queues once,
and make sure it's non-zero.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Jacob Keller 2017-07-10 13:23:11 -07:00 • committed by Jeff Kirsher

parent d876c1583b

commit dd5eede2b7

1 changed files with 6 additions and 2 deletions

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8

drivers/net/ethernet/intel/fm10k/fm10k_netdev.c

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