From: Andrew Gabbasov andrew_gabbasov@mentor.com
[ Upstream commit 68b9f0865b1ef545da180c57d54b82c94cb464a4 ]
In the function ravb_hwtstamp_get() in ravb_main.c with the existing values for RAVB_RXTSTAMP_TYPE_V2_L2_EVENT (0x2) and RAVB_RXTSTAMP_TYPE_ALL (0x6)
if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT) config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT; else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL) config.rx_filter = HWTSTAMP_FILTER_ALL;
if the test on RAVB_RXTSTAMP_TYPE_ALL should be true, it will never be reached.
This issue can be verified with 'hwtstamp_config' testing program (tools/testing/selftests/net/hwtstamp_config.c). Setting filter type to ALL and subsequent retrieving it gives incorrect value:
$ hwtstamp_config eth0 OFF ALL flags = 0 tx_type = OFF rx_filter = ALL $ hwtstamp_config eth0 flags = 0 tx_type = OFF rx_filter = PTP_V2_L2_EVENT
Correct this by converting if-else's to switch.
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Reported-by: Julia Lawall julia.lawall@inria.fr Signed-off-by: Andrew Gabbasov andrew_gabbasov@mentor.com Reviewed-by: Sergei Shtylyov sergei.shtylyov@gmail.com Link: https://lore.kernel.org/r/20201026102130.29368-1-andrew_gabbasov@mentor.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/renesas/ravb_main.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1741,12 +1741,16 @@ static int ravb_hwtstamp_get(struct net_ config.flags = 0; config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF; - if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT) + switch (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE) { + case RAVB_RXTSTAMP_TYPE_V2_L2_EVENT: config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT; - else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL) + break; + case RAVB_RXTSTAMP_TYPE_ALL: config.rx_filter = HWTSTAMP_FILTER_ALL; - else + break; + default: config.rx_filter = HWTSTAMP_FILTER_NONE; + }
return copy_to_user(req->ifr_data, &config, sizeof(config)) ? -EFAULT : 0;