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e1000e: fix division by zero on jumbo MTUs 

This patch fixes possible division by zero in receive
interrupt handler when working without adaptive interrupt
moderation.

The adaptive interrupt moderation mechanism is typically
disabled on jumbo MTUs.

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Leonid Bloch <leonid@daynix.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Dmitry Fleytman 2015-10-13 12:48:18 +03:00 committed by Jeff Kirsher
parent 13a87c124e
commit b77ac46bba
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -1959,8 +1959,10 @@ static irqreturn_t e1000_intr_msix_rx(int __always_unused irq, void *data)
* previous interrupt.
*/
if (rx_ring->set_itr) {
writel(1000000000 / (rx_ring->itr_val * 256),
rx_ring->itr_register);
u32 itr = rx_ring->itr_val ?
1000000000 / (rx_ring->itr_val * 256) : 0;
writel(itr, rx_ring->itr_register);
rx_ring->set_itr = 0;
}