linux-kernel - [PATCH net-next] net: stmmac: Convert open-coded register polling to helper macro

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250924152217.10749-1-0x1207@gmail.com>
Date: Wed, 24 Sep 2025 23:22:17 +0800
From: Furong Xu <0x1207@...il.com>
To: netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	xfr@...look.com,
	Furong Xu <0x1207@...il.com>
Subject: [PATCH net-next] net: stmmac: Convert open-coded register polling to helper macro

Drop the open-coded register polling routines.
Use readl_poll_timeout_atomic() in atomic state.

Compile tested only.
No functional change intended.

Signed-off-by: Furong Xu <0x1207@...il.com>
---
 .../ethernet/stmicro/stmmac/stmmac_hwtstamp.c | 28 ++++---------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
index e2840fa241f2..9e445ad1aa77 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
@@ -135,7 +135,6 @@ static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
 static int config_addend(void __iomem *ioaddr, u32 addend)
 {
 	u32 value;
-	int limit;
 
 	writel(addend, ioaddr + PTP_TAR);
 	/* issue command to update the addend value */
@@ -144,23 +143,15 @@ static int config_addend(void __iomem *ioaddr, u32 addend)
 	writel(value, ioaddr + PTP_TCR);
 
 	/* wait for present addend update to complete */
-	limit = 10;
-	while (limit--) {
-		if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
-			break;
-		mdelay(10);
-	}
-	if (limit < 0)
-		return -EBUSY;
-
-	return 0;
+	return readl_poll_timeout_atomic(ioaddr + PTP_TCR, value,
+				!(value & PTP_TCR_TSADDREG),
+				10, 100000);
 }
 
 static int adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
 		int add_sub, int gmac4)
 {
 	u32 value;
-	int limit;
 
 	if (add_sub) {
 		/* If the new sec value needs to be subtracted with
@@ -187,16 +178,9 @@ static int adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
 	writel(value, ioaddr + PTP_TCR);
 
 	/* wait for present system time adjust/update to complete */
-	limit = 10;
-	while (limit--) {
-		if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT))
-			break;
-		mdelay(10);
-	}
-	if (limit < 0)
-		return -EBUSY;
-
-	return 0;
+	return readl_poll_timeout_atomic(ioaddr + PTP_TCR, value,
+				!(value & PTP_TCR_TSUPDT),
+				10, 100000);
 }
 
 static void get_systime(void __iomem *ioaddr, u64 *systime)
-- 
2.43.0