netdev - [net PATCH v3] octeontx2-af: Move validation of ptp pointer before its usage

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Date: Thu, 6 Jul 2023 13:59:36 +0530
From: Sai Krishna <saikrishnag@...vell.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sgoutham@...vell.com>,
        <dan.carpenter@...aro.org>, <maciej.fijalkowski@...el.com>
CC: Sai Krishna <saikrishnag@...vell.com>,
        Naveen Mamindlapalli
	<naveenm@...vell.com>
Subject: [net PATCH v3] octeontx2-af: Move validation of ptp pointer before its usage

Moved PTP pointer validation before its use to avoid smatch warning.
Also used kzalloc/kfree instead of devm_kzalloc/devm_kfree.

Fixes: 2ef4e45d99b1 ("octeontx2-af: Add PTP PPS Errata workaround on CN10K silicon")
Signed-off-by: Naveen Mamindlapalli <naveenm@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
---
v3:
    - Addressed review comments given by Dan Carpenter
	1. Modified probe return value in normal way.
	2. Fixed crash in PTP probe fail case
	3. Returning error from AF probe in case of PTP probe fail
v2:
    - Addressed review comments given by Maciej Fijalkowski
	1. Modified patch title, commit message
	2. Used kzalloc/kfree instead of devm_kzalloc/devm_kfree

 .../net/ethernet/marvell/octeontx2/af/ptp.c   | 19 +++++++++----------
 .../net/ethernet/marvell/octeontx2/af/rvu.c   |  2 +-
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
index 3411e2e47d46..0ee420a489fc 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
@@ -208,7 +208,7 @@ struct ptp *ptp_get(void)
 	/* Check driver is bound to PTP block */
 	if (!ptp)
 		ptp = ERR_PTR(-EPROBE_DEFER);
-	else
+	else if (!IS_ERR(ptp))
 		pci_dev_get(ptp->pdev);
 
 	return ptp;
@@ -388,11 +388,10 @@ static int ptp_extts_on(struct ptp *ptp, int on)
 static int ptp_probe(struct pci_dev *pdev,
 		     const struct pci_device_id *ent)
 {
-	struct device *dev = &pdev->dev;
 	struct ptp *ptp;
 	int err;
 
-	ptp = devm_kzalloc(dev, sizeof(*ptp), GFP_KERNEL);
+	ptp = kzalloc(sizeof(*ptp), GFP_KERNEL);
 	if (!ptp) {
 		err = -ENOMEM;
 		goto error;
@@ -428,20 +427,19 @@ static int ptp_probe(struct pci_dev *pdev,
 	return 0;
 
 error_free:
-	devm_kfree(dev, ptp);
+	kfree(ptp);
 
 error:
 	/* For `ptp_get()` we need to differentiate between the case
 	 * when the core has not tried to probe this device and the case when
-	 * the probe failed.  In the later case we pretend that the
-	 * initialization was successful and keep the error in
+	 * the probe failed.  In the later case we keep the error in
 	 * `dev->driver_data`.
 	 */
 	pci_set_drvdata(pdev, ERR_PTR(err));
 	if (!first_ptp_block)
 		first_ptp_block = ERR_PTR(err);
 
-	return 0;
+	return err;
 }
 
 static void ptp_remove(struct pci_dev *pdev)
@@ -449,16 +447,17 @@ static void ptp_remove(struct pci_dev *pdev)
 	struct ptp *ptp = pci_get_drvdata(pdev);
 	u64 clock_cfg;
 
-	if (cn10k_ptp_errata(ptp) && hrtimer_active(&ptp->hrtimer))
-		hrtimer_cancel(&ptp->hrtimer);
-
 	if (IS_ERR_OR_NULL(ptp))
 		return;
 
+	if (cn10k_ptp_errata(ptp) && hrtimer_active(&ptp->hrtimer))
+		hrtimer_cancel(&ptp->hrtimer);
+
 	/* Disable PTP clock */
 	clock_cfg = readq(ptp->reg_base + PTP_CLOCK_CFG);
 	clock_cfg &= ~PTP_CLOCK_CFG_PTP_EN;
 	writeq(clock_cfg, ptp->reg_base + PTP_CLOCK_CFG);
+	kfree(ptp);
 }
 
 static const struct pci_device_id ptp_id_table[] = {
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index 8dbc35c481f6..73df2d564545 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -3252,7 +3252,7 @@ static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	rvu->ptp = ptp_get();
 	if (IS_ERR(rvu->ptp)) {
 		err = PTR_ERR(rvu->ptp);
-		if (err == -EPROBE_DEFER)
+		if (err)
 			goto err_release_regions;
 		rvu->ptp = NULL;
 	}
-- 
2.25.1