From: Mitch Williams Date: Tue, 14 May 2019 17:37:00 +0000 (-0700) Subject: iavf: use signed variable X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=168d91cf2a90a809502b665fff6b4c66579e8f0a;p=openwrt%2Fstaging%2Fblogic.git iavf: use signed variable The counter variable in iavf_clean_tx_irq starts out negative and climbs to 0. So allocating it as u16 is actually a really bad idea that just happens to work because the value underflows and overflows consistently on most architectures. Replace the u16 with an int so signed math works as expected. Signed-off-by: Mitch Williams Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c index 6d43cbe29c49..d28b57937245 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c @@ -190,7 +190,7 @@ void iavf_detect_recover_hung(struct iavf_vsi *vsi) static bool iavf_clean_tx_irq(struct iavf_vsi *vsi, struct iavf_ring *tx_ring, int napi_budget) { - u16 i = tx_ring->next_to_clean; + int i = tx_ring->next_to_clean; struct iavf_tx_buffer *tx_buf; struct iavf_tx_desc *tx_desc; unsigned int total_bytes = 0, total_packets = 0;