linux-kernel - [PATCH] dmaengine: ppc4xx: Convert to use sysfs_emit()/sysfs_emit

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Message-ID: <202212061714501297954@zte.com.cn>
Date:   Tue, 6 Dec 2022 17:14:50 +0800 (CST)
From:   <ye.xingchen@....com.cn>
To:     <vkoul@...nel.org>
Cc:     <cai.huoqing@...ux.dev>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] dmaengine: ppc4xx: Convert to use sysfs_emit()/sysfs_emit_at() APIs

From: ye xingchen <ye.xingchen@....com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
---
 drivers/dma/ppc4xx/adma.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
index 6b5e91f26afc..686c270ef710 100644
--- a/drivers/dma/ppc4xx/adma.c
+++ b/drivers/dma/ppc4xx/adma.c
@@ -4299,9 +4299,8 @@ static ssize_t devices_show(struct device_driver *dev, char *buf)
 	for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) {
 		if (ppc440spe_adma_devices[i] == -1)
 			continue;
-		size += scnprintf(buf + size, PAGE_SIZE - size,
-				 "PPC440SP(E)-ADMA.%d: %s\n", i,
-				 ppc_adma_errors[ppc440spe_adma_devices[i]]);
+		size += sysfs_emit_at(buf, size, "PPC440SP(E)-ADMA.%d: %s\n",
+				     i, ppc_adma_errors[ppc440spe_adma_devices[i]]);
 	}
 	return size;
 }
@@ -4309,9 +4308,8 @@ static DRIVER_ATTR_RO(devices);

 static ssize_t enable_show(struct device_driver *dev, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE,
-			"PPC440SP(e) RAID-6 capabilities are %sABLED.\n",
-			ppc440spe_r6_enabled ? "EN" : "DIS");
+	return sysfs_emit(buf, "PPC440SP(e) RAID-6 capabilities are %sABLED.\n",
+			  ppc440spe_r6_enabled ? "EN" : "DIS");
 }

 static ssize_t enable_store(struct device_driver *dev, const char *buf,
@@ -4362,7 +4360,7 @@ static ssize_t poly_show(struct device_driver *dev, char *buf)
 	reg &= 0xFF;
 #endif

-	size = snprintf(buf, PAGE_SIZE, "PPC440SP(e) RAID-6 driver "
+	size = sysfs_emit(buf, "PPC440SP(e) RAID-6 driver "
 			"uses 0x1%02x polynomial.\n", reg);
 	return size;
 }
-- 
2.25.1