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 <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index 6d43cbe29c4955636ea4b9efa3e8368013973a9a..d28b579372452698ec7c682dd9489035abe8c8f2 100644 (file)
--- 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;