linux-kernel - [PATCH 11/12] usb: phy: twl6030: Remove snprintf() from sysfs call-backs and replace with sysfs

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Date:   Wed, 13 Dec 2023 16:42:40 +0000
From:   Lee Jones <lee@...nel.org>
To:     lee@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Hema HK <hemahk@...com>
Subject: [PATCH 11/12] usb: phy: twl6030: 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: Hema HK <hemahk@...com>
Signed-off-by: Lee Jones <lee@...nel.org>
---
 drivers/usb/phy/phy-twl6030-usb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/phy/phy-twl6030-usb.c b/drivers/usb/phy/phy-twl6030-usb.c
index c3ce6b1054f1c..da09cff55abce 100644
--- a/drivers/usb/phy/phy-twl6030-usb.c
+++ b/drivers/usb/phy/phy-twl6030-usb.c
@@ -179,16 +179,16 @@ static ssize_t vbus_show(struct device *dev,
 
 	switch (twl->linkstat) {
 	case MUSB_VBUS_VALID:
-	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
+	       ret = sysfs_emit(buf, "vbus\n");
 	       break;
 	case MUSB_ID_GROUND:
-	       ret = snprintf(buf, PAGE_SIZE, "id\n");
+	       ret = sysfs_emit(buf, "id\n");
 	       break;
 	case MUSB_VBUS_OFF:
-	       ret = snprintf(buf, PAGE_SIZE, "none\n");
+	       ret = sysfs_emit(buf, "none\n");
 	       break;
 	default:
-	       ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
+	       ret = sysfs_emit(buf, "UNKNOWN\n");
 	}
 	spin_unlock_irqrestore(&twl->lock, flags);
 
-- 
2.43.0.472.g3155946c3a-goog