This is a note to let you know that I've just added the patch titled ravb: Fix bit fields checking in ravb_hwtstamp_get() to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ravb-fix-bit-fields-checking-in-ravb_hwtstamp_get.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sat Oct 31 10:39:08 AM CET 2020 From: Andrew Gabbasov <andrew_gabbasov@xxxxxxxxxx> Date: Mon, 26 Oct 2020 05:21:30 -0500 Subject: ravb: Fix bit fields checking in ravb_hwtstamp_get() From: Andrew Gabbasov <andrew_gabbasov@xxxxxxxxxx> [ 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@xxxxxxxx> Signed-off-by: Andrew Gabbasov <andrew_gabbasov@xxxxxxxxxx> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxx> Link: https://lore.kernel.org/r/20201026102130.29368-1-andrew_gabbasov@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -1768,12 +1768,16 @@ 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; Patches currently in stable-queue which might be from andrew_gabbasov@xxxxxxxxxx are queue-4.14/ravb-fix-bit-fields-checking-in-ravb_hwtstamp_get.patch