linux-kernel - [PATCH 1/5] scsi: 3w-9xxx: Remove snprintf() from sysfs call-backs and replace with sysfs

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Message-ID: <20240111131732.1815560-2-lee@kernel.org>
Date: Thu, 11 Jan 2024 13:17:22 +0000
From: Lee Jones <lee@...nel.org>
To: lee@...nel.org,
	jejb@...ux.ibm.com,
	martin.petersen@...cle.com
Cc: linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Adam Radford <aradford@...il.com>
Subject: [PATCH 1/5] scsi: 3w-9xxx: Remove snprintf() from sysfs call-backs and replace with sysfs_emit()

Since snprintf() has the documented, but still rather strange trait of
returning the length of the data that *would have been* written to the
array if space were available, rather than the arguably more useful
length of data *actually* written, it is usually considered wise to use
something else instead in order to avoid confusion.

In the case of sysfs call-backs, new wrappers exist that do just that.

Link: https://lwn.net/Articles/69419/
Link: https://github.com/KSPP/linux/issues/105
Cc: Adam Radford <aradford@...il.com>
Signed-off-by: Lee Jones <lee@...nel.org>
---
 drivers/scsi/3w-9xxx.c | 44 +++++++++++++++++++++---------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index f925f8664c2c1..6fb61c88ea119 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -161,28 +161,28 @@ static ssize_t twa_show_stats(struct device *dev,
 	ssize_t len;
 
 	spin_lock_irqsave(tw_dev->host->host_lock, flags);
-	len = snprintf(buf, PAGE_SIZE, "3w-9xxx Driver version: %s\n"
-		       "Current commands posted:   %4d\n"
-		       "Max commands posted:       %4d\n"
-		       "Current pending commands:  %4d\n"
-		       "Max pending commands:      %4d\n"
-		       "Last sgl length:           %4d\n"
-		       "Max sgl length:            %4d\n"
-		       "Last sector count:         %4d\n"
-		       "Max sector count:          %4d\n"
-		       "SCSI Host Resets:          %4d\n"
-		       "AEN's:                     %4d\n",
-		       TW_DRIVER_VERSION,
-		       tw_dev->posted_request_count,
-		       tw_dev->max_posted_request_count,
-		       tw_dev->pending_request_count,
-		       tw_dev->max_pending_request_count,
-		       tw_dev->sgl_entries,
-		       tw_dev->max_sgl_entries,
-		       tw_dev->sector_count,
-		       tw_dev->max_sector_count,
-		       tw_dev->num_resets,
-		       tw_dev->aen_count);
+	len = sysfs_emit(buf, "3w-9xxx Driver version: %s\n"
+			 "Current commands posted:   %4d\n"
+			 "Max commands posted:       %4d\n"
+			 "Current pending commands:  %4d\n"
+			 "Max pending commands:      %4d\n"
+			 "Last sgl length:           %4d\n"
+			 "Max sgl length:            %4d\n"
+			 "Last sector count:         %4d\n"
+			 "Max sector count:          %4d\n"
+			 "SCSI Host Resets:          %4d\n"
+			 "AEN's:                     %4d\n",
+			 TW_DRIVER_VERSION,
+			 tw_dev->posted_request_count,
+			 tw_dev->max_posted_request_count,
+			 tw_dev->pending_request_count,
+			 tw_dev->max_pending_request_count,
+			 tw_dev->sgl_entries,
+			 tw_dev->max_sgl_entries,
+			 tw_dev->sector_count,
+			 tw_dev->max_sector_count,
+			 tw_dev->num_resets,
+			 tw_dev->aen_count);
 	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
 	return len;
 } /* End twa_show_stats() */
-- 
2.43.0.275.g3460e3d667-goog