[PATCH net 0/3] net: ethernet: fixes for stmmac and fec

[PATCH net 0/3] net: ethernet: fixes for stmmac and fec

[Joakim Zhang]

Small fixes for stmmac and fec.

Andy Duan (1):
  net: fec_ptp: add clock rate zero check

Joakim Zhang (2):
  net: stmmac: disable clocks in stmmac_remove_config_dt()
  net: stmmac: avoid kernel panic in tc_setup_taprio()

 drivers/net/ethernet/freescale/fec_ptp.c              | 4 ++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 ++
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c       | 8 +++++---
 3 files changed, 11 insertions(+), 3 deletions(-)

-- 
2.17.1


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[PATCH net 1/3] net: stmmac: disable clocks in stmmac_remove_config_dt()

[Joakim Zhang]

Platform drivers may call stmmac_probe_config_dt() to parse dt, could
call stmmac_remove_config_dt() in error handing after dt parsed, so need
disable clocks in stmmac_remove_config_dt().

Go through all platforms drivers which use stmmac_probe_config_dt(),
none of them disable clocks manually, so it's safe to disable them in
stmmac_remove_config_dt().

Fixes: commit d2ed0a7755fe ("net: ethernet: stmmac: fix of-node and fixed-link-phydev leaks")
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 1e17a23d9118..a696ada013eb 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -622,6 +622,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 void stmmac_remove_config_dt(struct platform_device *pdev,
 			     struct plat_stmmacenet_data *plat)
 {
+	clk_disable_unprepare(plat->stmmac_clk);
+	clk_disable_unprepare(plat->pclk);
 	of_node_put(plat->phy_node);
 	of_node_put(plat->mdio_node);
 }
-- 
2.17.1


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[PATCH net 2/3] net: stmmac: avoid kernel panic in tc_setup_taprio()

[Joakim Zhang]

Use linux tc command to setup the taprio with hardware offload enabled,
in some circumstances when taprio parameter error causing the taprio_init
failure in qdisc_create(), then cause taprio_destroy() which call
tc_setup_taprio() in the stmmac_tc.c and panic on the un-allocated
est structure as below.

[ 15.417444] 003: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 15.417455] 003: Mem abort info:
[ 15.417457] 003: ESR = 0x96000044
[ 15.417460] 003: EC = 0x25: DABT (current EL), IL = 32 bits
[ 15.417464] 003: SET = 0, FnV = 0
[ 15.417467] 003: EA = 0, S1PTW = 0
[ 15.417469] 003: Data abort info:
[ 15.417471] 003: ISV = 0, ISS = 0x00000044
[ 15.417474] 003: CM = 0, WnR = 1
[ 15.417487] 003: Internal
[ 15.417476] 003: user pgtable: 4k pages, 48-bit VAs, pgdp=00000001b71c4000 error: Oops: 96000044 [#1] PREEMPT SMP
[ 15.417482] 003: [0000000000000000] pgd=0000000000000000
[ 15.417487] 003: Internal error: Oops: 96000044 [#1] PREEMPT SMP
[ 15.417492] 003: Modules linked in:
[ 15.417494] 003: CPU: 3 PID: 836 Comm: tc Not tainted 5.4.24-rt15-00033-gdb22403-dirty #3
[ 15.417499] 003: Hardware name: NXP i.MX8MPlus EVK board (DT)
[ 15.417501] 003: pstate: 80000005 (Nzcv daif -PAN -UAO)
[ 15.417504] 003: pc : tc_setup_taprio+0x1b8/0x390
[ 15.417514] 003: lr : stmmac_setup_tc+0xa0/0x3b4
[ 15.417519] 003: sp : ffff8000126c3760
[ 15.417521] 003: x29: ffff8000126c3760 x28: ffff000177712400
[ 15.417526] 003: x27: ffff000176e4b000 x26: ffff8000126c392c
[ 15.417530] 003: x25: 00000000ffffffff x24: ffff800011f903b0
[ 15.417534] 003: x23: ffff8000126c3a80 x22: 0000000000000018
[ 15.417537] 003: x21: ffff000177040080 x20: 0000000000000000
[ 15.417541] 003: x19: ffff000177044840 x18: 0000000000000000
[ 15.417544] 003: x17: 0000000000000000 x16: 0000000000000000
[ 15.417547] 003: x15: 0000000000000000 x14: 000186a000040008
[ 15.417551] 003: x13: ffff8000114db3d8 x12: 0000000000000020
[ 15.417554] 003: x11: 0000000000000030 x10: 0000000000000000
[ 15.417558] 003: x9 : 0000000000000000 x8 : ffff00017088ee00
[ 15.417563] 003: x7 : 0000000000000000 x6 : 000000000000003f
[ 15.417566] 003: x5 : 0000000000000040 x4 : 0000000000000000
[ 15.417570] 003: x3 : ffff800010b94d74 x2 : 0000000000000001
[ 15.417573] 003: x1 : 0000000000000000 x0 : 0000000000000000
[ 15.417576] 003: Call trace:
[ 15.417578] 003: tc_setup_taprio+0x1b8/0x390
[ 15.417581] 003: stmmac_setup_tc+0xa0/0x3b4
[ 15.417585] 003: taprio_disable_offload.isra.30+0x78/0xe8
[ 15.417590] 003: taprio_destroy+0x80/0x11c
[ 15.417592] 003: qdisc_create+0x408/0x4c8
[ 15.417597] 003: tc_modify_qdisc+0x1e0/0x688
[ 15.417600] 003: rtnetlink_rcv_msg+0x120/0x330
[ 15.417603] 003: netlink_rcv_skb+0xec/0x12c
[ 15.417607] 003: rtnetlink_rcv+0x28/0x34
[ 15.417609] 003: netlink_unicast+0x18c/0x21c
[ 15.417612] 003: netlink_sendmsg+0x27c/0x360
[ 15.417616] 003: ____sys_sendmsg+0x284/0x2b4
[ 15.417620] 003: ___sys_sendmsg+0x90/0xd0
[ 15.417623] 003: __sys_sendmsg+0x78/0xd0
[ 15.417626] 003: __arm64_sys_sendmsg+0x2c/0x38
[ 15.417629] 003: el0_svc_common.constprop.2+0xd8/0x178
[ 15.417633] 003: el0_svc_handler+0x34/0x9c
[ 15.417635] 003: el0_svc+0x8/0xc

Fixes: b60189e0392f ("net: stmmac: Integrate EST with TAPRIO scheduler API")
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 4e70efc45458..dbd1320c2597 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -862,9 +862,11 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	return 0;
 
 disable:
-	priv->plat->est->enable = false;
-	stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
-			     priv->plat->clk_ptp_rate);
+	if (priv->plat->est) {
+		priv->plat->est->enable = false;
+		stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
+				     priv->plat->clk_ptp_rate);
+	}
 
 	priv->plat->fpe_cfg->enable = false;
 	stmmac_fpe_configure(priv, priv->ioaddr,
-- 
2.17.1


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[PATCH net 3/3] net: fec_ptp: add clock rate zero check

[Joakim Zhang]

From: Fugang Duan <fugang.duan@nxp.com>

Add clock rate zero check to fix coverity issue of "divide by 0".

Fixes: commit 85bd1798b24a ("net: fec: fix spin_lock dead lock")
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 drivers/net/ethernet/freescale/fec_ptp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index 1753807cbf97..7326a0612823 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -604,6 +604,10 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 	fep->ptp_caps.enable = fec_ptp_enable;
 
 	fep->cycle_speed = clk_get_rate(fep->clk_ptp);
+	if (!fep->cycle_speed) {
+		fep->cycle_speed = NSEC_PER_SEC;
+		dev_err(&fep->pdev->dev, "clk_ptp clock rate is zero\n");
+	}
 	fep->ptp_inc = NSEC_PER_SEC / fep->cycle_speed;
 
 	spin_lock_init(&fep->tmreg_lock);
-- 
2.17.1


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