linux-kernel - [PATCH] usb: usblp: Use min_t() to improve usblp

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Message-ID: <20250829173713.56222-1-thorsten.blum@linux.dev>
Date: Fri, 29 Aug 2025 19:37:12 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Pete Zaitcev <zaitcev@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: usblp: Use min_t() to improve usblp_read()

Use min_t() to improve usblp_read() and avoid calculating
'avail - usblp->readcount' twice. Use min_t(ssize_t,,) instead of min()
to avoid a signedness error.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 drivers/usb/class/usblp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index acbefccbdb2a..a7a1d38b6bef 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -34,6 +34,7 @@
 
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/minmax.h>
 #include <linux/sched/signal.h>
 #include <linux/signal.h>
 #include <linux/poll.h>
@@ -871,7 +872,7 @@ static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, lo
 		goto done;
 	}
 
-	count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
+	count = min_t(ssize_t, len, avail - usblp->readcount);
 	if (count != 0 &&
 	    copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
 		count = -EFAULT;
-- 
2.50.1