linux-kernel - [PATCH RESEND v3 05/11] usb: oxu210hp-hcd: convert to readl_poll_timeout

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

Message-ID: <1599726112-4439-5-git-send-email-chunfeng.yun@mediatek.com>
Date:   Thu, 10 Sep 2020 16:21:46 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Jann Horn <jannh@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Jason Yan <yanaijie@...wei.com>,
        Chuhong Yuan <hslester96@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Saurav Girepunje <saurav.girepunje@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH RESEND v3 05/11] usb: oxu210hp-hcd: convert to readl_poll_timeout_atomic()

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2~v3: no changes
---
 drivers/usb/host/oxu210hp-hcd.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/oxu210hp-hcd.c b/drivers/usb/host/oxu210hp-hcd.c
index cfa7dd2..27dbbe1 100644
--- a/drivers/usb/host/oxu210hp-hcd.c
+++ b/drivers/usb/host/oxu210hp-hcd.c
@@ -24,6 +24,7 @@
 #include <linux/moduleparam.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 
 #include <asm/irq.h>
 #include <asm/unaligned.h>
@@ -748,18 +749,16 @@ static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
 					u32 mask, u32 done, int usec)
 {
 	u32 result;
+	int ret;
 
-	do {
-		result = readl(ptr);
-		if (result == ~(u32)0)		/* card removed */
-			return -ENODEV;
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(1);
-		usec--;
-	} while (usec > 0);
-	return -ETIMEDOUT;
+	ret = readl_poll_timeout_atomic(ptr, result,
+					((result & mask) == done ||
+					 result == U32_MAX),
+					1, usec);
+	if (result == U32_MAX)		/* card removed */
+		return -ENODEV;
+
+	return ret;
 }
 
 /* Force HC to halt state from unknown (EHCI spec section 2.3) */
-- 
1.9.1