* [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional
@ 2016-09-20 23:25 Nicolas Pitre
2016-09-21 8:45 ` Richard Cochran
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Nicolas Pitre @ 2016-09-20 23:25 UTC (permalink / raw)
To: Richard Cochran, David S. Miller
Cc: John Stultz, Thomas Gleixner, Josh Triplett, netdev, linux-kernel
Drivers must be ready to accept NULL from ptp_clock_register() if the
PTP clock subsystem is configured out.
This patch documents that and ensures that all drivers cope well
with a NULL return.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Eugenia Emantayev <eugenia@mellanox.com>
---
Let's have the basics merged now and work out the actual Kconfig issue
separately. Richard, if you agree with this patch, I think this could go
via the netdev tree.
diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
index 2e1b17ad52..ad03763e00 100644
--- a/drivers/net/ethernet/intel/e1000e/ptp.c
+++ b/drivers/net/ethernet/intel/e1000e/ptp.c
@@ -334,7 +334,7 @@ void e1000e_ptp_init(struct e1000_adapter *adapter)
if (IS_ERR(adapter->ptp_clock)) {
adapter->ptp_clock = NULL;
e_err("ptp_clock_register failed\n");
- } else {
+ } else if (adapter->ptp_clock) {
e_info("registered PHC clock\n");
}
}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
index ed39cbad24..f1feceab75 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ptp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
@@ -669,7 +669,7 @@ void i40e_ptp_init(struct i40e_pf *pf)
pf->ptp_clock = NULL;
dev_err(&pf->pdev->dev, "%s: ptp_clock_register failed\n",
__func__);
- } else {
+ } else if (pf->ptp_clock) {
struct timespec64 ts;
u32 regval;
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 336c103ae3..7531892b08 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -1159,7 +1159,7 @@ void igb_ptp_init(struct igb_adapter *adapter)
if (IS_ERR(adapter->ptp_clock)) {
adapter->ptp_clock = NULL;
dev_err(&adapter->pdev->dev, "ptp_clock_register failed\n");
- } else {
+ } else if (adapter->ptp_clock) {
dev_info(&adapter->pdev->dev, "added PHC on %s\n",
adapter->netdev->name);
adapter->ptp_flags |= IGB_PTP_ENABLED;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
index e5431bfe33..a92277683a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
@@ -1254,7 +1254,7 @@ static long ixgbe_ptp_create_clock(struct ixgbe_adapter *adapter)
adapter->ptp_clock = NULL;
e_dev_err("ptp_clock_register failed\n");
return err;
- } else
+ } else if (adapter->ptp_clock)
e_dev_info("registered PHC device on %s\n", netdev->name);
/* set default timestamp mode to disabled here. We do this in
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
index 1494997c4f..08fc5fc56d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
@@ -298,7 +298,7 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
if (IS_ERR(mdev->ptp_clock)) {
mdev->ptp_clock = NULL;
mlx4_err(mdev, "ptp_clock_register failed\n");
- } else {
+ } else if (mdev->ptp_clock) {
mlx4_info(mdev, "registered PHC clock\n");
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c b/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
index 847a8f3ac2..13dc388667 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
@@ -273,7 +273,7 @@ void mlx5e_timestamp_init(struct mlx5e_priv *priv)
tstamp->ptp = ptp_clock_register(&tstamp->ptp_info,
&priv->mdev->pdev->dev);
- if (IS_ERR_OR_NULL(tstamp->ptp)) {
+ if (IS_ERR(tstamp->ptp)) {
mlx5_core_warn(priv->mdev, "ptp_clock_register failed %ld\n",
PTR_ERR(tstamp->ptp));
tstamp->ptp = NULL;
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index c771e0af4e..f105a170b4 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1269,13 +1269,13 @@ int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel)
if (IS_ERR(ptp->phc_clock)) {
rc = PTR_ERR(ptp->phc_clock);
goto fail3;
- }
-
- INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker);
- ptp->pps_workwq = create_singlethread_workqueue("sfc_pps");
- if (!ptp->pps_workwq) {
- rc = -ENOMEM;
- goto fail4;
+ } else if (ptp->phc_clock) {
+ INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker);
+ ptp->pps_workwq = create_singlethread_workqueue("sfc_pps");
+ if (!ptp->pps_workwq) {
+ rc = -ENOMEM;
+ goto fail4;
+ }
}
}
ptp->nic_ts_enabled = false;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index 170a18b612..6e3b82972c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -187,7 +187,7 @@ int stmmac_ptp_register(struct stmmac_priv *priv)
if (IS_ERR(priv->ptp_clock)) {
priv->ptp_clock = NULL;
pr_err("ptp_clock_register() failed on %s\n", priv->dev->name);
- } else
+ } else if (priv->ptp_clock)
pr_debug("Added PTP HW clock successfully on %s\n",
priv->dev->name);
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 6b15e16814..5ad54fc66c 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -127,6 +127,11 @@ struct ptp_clock;
*
* @info: Structure describing the new clock.
* @parent: Pointer to the parent device of the new clock.
+ *
+ * Returns a valid pointer on success or PTR_ERR on failure. If PHC
+ * support is missing at the configuration level, this function
+ * returns NULL, and drivers are expected to gracefully handle that
+ * case separately.
*/
extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional
2016-09-20 23:25 [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional Nicolas Pitre
@ 2016-09-21 8:45 ` Richard Cochran
2016-09-21 15:10 ` Edward Cree
2016-09-22 6:18 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Richard Cochran @ 2016-09-21 8:45 UTC (permalink / raw)
To: Nicolas Pitre
Cc: David S. Miller, John Stultz, Thomas Gleixner, Josh Triplett,
netdev, linux-kernel
On Tue, Sep 20, 2016 at 07:25:58PM -0400, Nicolas Pitre wrote:
>
> Drivers must be ready to accept NULL from ptp_clock_register() if the
> PTP clock subsystem is configured out.
>
> This patch documents that and ensures that all drivers cope well
> with a NULL return.
>
> Signed-off-by: Nicolas Pitre <nico@linaro.org>
> Reviewed-by: Eugenia Emantayev <eugenia@mellanox.com>
>
> ---
>
> Let's have the basics merged now and work out the actual Kconfig issue
> separately. Richard, if you agree with this patch, I think this could go
> via the netdev tree.
It looks ok to me.
Acked-by: Richard Cochran <richardcochran@gmail.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional
2016-09-20 23:25 [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional Nicolas Pitre
2016-09-21 8:45 ` Richard Cochran
@ 2016-09-21 15:10 ` Edward Cree
2016-09-22 6:18 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Edward Cree @ 2016-09-21 15:10 UTC (permalink / raw)
To: Nicolas Pitre, Richard Cochran, David S. Miller
Cc: John Stultz, Thomas Gleixner, Josh Triplett, netdev, linux-kernel
On 21/09/16 00:25, Nicolas Pitre wrote:
> Drivers must be ready to accept NULL from ptp_clock_register() if the
> PTP clock subsystem is configured out.
>
> This patch documents that and ensures that all drivers cope well
> with a NULL return.
>
> Signed-off-by: Nicolas Pitre <nico@linaro.org>
> Reviewed-by: Eugenia Emantayev <eugenia@mellanox.com>
[...]
> diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
> index c771e0af4e..f105a170b4 100644
> --- a/drivers/net/ethernet/sfc/ptp.c
> +++ b/drivers/net/ethernet/sfc/ptp.c
> @@ -1269,13 +1269,13 @@ int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel)
> if (IS_ERR(ptp->phc_clock)) {
> rc = PTR_ERR(ptp->phc_clock);
> goto fail3;
> - }
> -
> - INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker);
> - ptp->pps_workwq = create_singlethread_workqueue("sfc_pps");
> - if (!ptp->pps_workwq) {
> - rc = -ENOMEM;
> - goto fail4;
> + } else if (ptp->phc_clock) {
> + INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker);
> + ptp->pps_workwq = create_singlethread_workqueue("sfc_pps");
> + if (!ptp->pps_workwq) {
> + rc = -ENOMEM;
> + goto fail4;
> + }
> }
> }
> ptp->nic_ts_enabled = false;
For the sfc change:
Acked-by: Edward Cree <ecree@solarflare.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional
2016-09-20 23:25 [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional Nicolas Pitre
2016-09-21 8:45 ` Richard Cochran
2016-09-21 15:10 ` Edward Cree
@ 2016-09-22 6:18 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2016-09-22 6:18 UTC (permalink / raw)
To: nicolas.pitre
Cc: richardcochran, john.stultz, tglx, josh, netdev, linux-kernel
From: Nicolas Pitre <nicolas.pitre@linaro.org>
Date: Tue, 20 Sep 2016 19:25:58 -0400 (EDT)
>
> Drivers must be ready to accept NULL from ptp_clock_register() if the
> PTP clock subsystem is configured out.
>
> This patch documents that and ensures that all drivers cope well
> with a NULL return.
>
> Signed-off-by: Nicolas Pitre <nico@linaro.org>
> Reviewed-by: Eugenia Emantayev <eugenia@mellanox.com>
>
> ---
>
> Let's have the basics merged now and work out the actual Kconfig issue
> separately. Richard, if you agree with this patch, I think this could go
> via the netdev tree.
Applied to net-next, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-09-22 6:27 UTC | newest]
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2016-09-20 23:25 [PATCH] ptp_clock: future-proofing drivers against PTP subsystem becoming optional Nicolas Pitre
2016-09-21 8:45 ` Richard Cochran
2016-09-21 15:10 ` Edward Cree
2016-09-22 6:18 ` David Miller
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