linux-kernel - [PATCH] hw_random: replace snprintf in show functions with sysfs

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Date:   Tue, 12 Oct 2021 20:26:01 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] hw_random: replace snprintf in show functions with sysfs_emit

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the following coccicheck warning:
drivers/char/hw_random/s390-trng.c:114:8-16: WARNING: use scnprintf or sprintf.
drivers/char/hw_random/s390-trng.c:122:8-16: WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/char/hw_random/s390-trng.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/s390-trng.c b/drivers/char/hw_random/s390-trng.c
index 7c673af..2beaa35 100644
--- a/drivers/char/hw_random/s390-trng.c
+++ b/drivers/char/hw_random/s390-trng.c
@@ -111,7 +111,7 @@ static ssize_t trng_counter_show(struct device *dev,
 #if IS_ENABLED(CONFIG_ARCH_RANDOM)
 	u64 arch_counter = atomic64_read(&s390_arch_random_counter);
 
-	return snprintf(buf, PAGE_SIZE,
+	return sysfs_emit(buf,
 			"trng:  %llu\n"
 			"hwrng: %llu\n"
 			"arch:  %llu\n"
@@ -119,7 +119,7 @@ static ssize_t trng_counter_show(struct device *dev,
 			dev_counter, hwrng_counter, arch_counter,
 			dev_counter + hwrng_counter + arch_counter);
 #else
-	return snprintf(buf, PAGE_SIZE,
+	return sysfs_emit(buf,
 			"trng:  %llu\n"
 			"hwrng: %llu\n"
 			"total: %llu\n",
-- 
2.7.4