linux-kernel - [PATCH] intel_th: Convert sprintf/snprintf to sysfs

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Date: Thu, 14 Mar 2024 17:13:26 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH] intel_th: Convert sprintf/snprintf to sysfs_emit

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() will be converted as weel if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hwtracing/intel_th/gth.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c
index b3308934a687..3883f99fd5d5 100644
--- a/drivers/hwtracing/intel_th/gth.c
+++ b/drivers/hwtracing/intel_th/gth.c
@@ -154,9 +154,9 @@ static ssize_t master_attr_show(struct device *dev,
 	spin_unlock(&gth->gth_lock);
 
 	if (port >= 0)
-		count = snprintf(buf, PAGE_SIZE, "%x\n", port);
+		count = sysfs_emit(buf, "%x\n", port);
 	else
-		count = snprintf(buf, PAGE_SIZE, "disabled\n");
+		count = sysfs_emit(buf, "disabled\n");
 
 	return count;
 }
@@ -332,8 +332,8 @@ static ssize_t output_attr_show(struct device *dev,
 	pm_runtime_get_sync(dev);
 
 	spin_lock(&gth->gth_lock);
-	count = snprintf(buf, PAGE_SIZE, "%x\n",
-			 gth_output_parm_get(gth, oa->port, oa->parm));
+	count = sysfs_emit(buf, "%x\n",
+			   gth_output_parm_get(gth, oa->port, oa->parm));
 	spin_unlock(&gth->gth_lock);
 
 	pm_runtime_put(dev);
-- 
2.29.2