Messages in this thread Patch in this message | | | From | Johannes Zink <> | Date | Thu, 12 Oct 2023 11:02:16 +0200 | Subject | [PATCH net-next 5/5] net: stmmac: do not silently change auxiliary snapshot capture channel |
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Even though the hardware theoretically supports up to 4 simultaneous auxiliary snapshot capture channels, the stmmac driver does support only a single channel to be active at a time.
Previously in case of a PTP_CLK_REQ_EXTTS request, previously active auxiliary snapshot capture channels were silently dropped and the new channel was activated.
Instead of silently changing the state for all consumers, log an error and return -EBUSY if a channel is already in use in order to signal to userspace to disable the currently active channel before enabling another one.
Signed-off-by: Johannes Zink <j.zink@pengutronix.de> --- drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c index 2a141db70c2e..56683afc650c 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c @@ -191,11 +191,23 @@ static int stmmac_enable(struct ptp_clock_info *ptp, priv->systime_flags); write_unlock_irqrestore(&priv->ptp_lock, flags); break; - case PTP_CLK_REQ_EXTTS: + case PTP_CLK_REQ_EXTTS: { + u8 channel; + mutex_lock(&priv->aux_ts_lock); acr_value = readl(ptpaddr + PTP_ACR); + channel = ilog2(FIELD_GET(PTP_ACR_MASK, acr_value)); acr_value &= ~PTP_ACR_MASK; + if (on) { + if (FIELD_GET(PTP_ACR_MASK, acr_value)) { + netdev_err(priv->dev, + "Cannot enable auxiliary snapshot %d as auxiliary snapshot %d is already enabled", + rq->extts.index, channel); + mutex_unlock(&priv->aux_ts_lock); + return -EBUSY; + } + priv->plat->flags |= STMMAC_FLAG_EXT_SNAPSHOT_EN; /* Enable External snapshot trigger */ @@ -213,6 +225,7 @@ static int stmmac_enable(struct ptp_clock_info *ptp, !(acr_value & PTP_ACR_ATSFC), 10, 10000); break; + } default: break; -- 2.39.2
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