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From:   "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
To:     gregkh@linuxfoundation.org
Cc:     linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@kernel.org>,
        Dan Carpenter <dan.carpenter@linaro.org>,
        linux-staging@lists.linux.dev
Subject: [PATCH 34-and-three-quarters/36] tty: gdm724x: simplify gdm_tty_write()
Date:   Thu, 10 Aug 2023 12:39:00 +0200
Message-ID: <20230810103900.19353-1-jirislaby@kernel.org>
In-Reply-To: <ba8becf4-786a-4923-92f7-b4ec3038295f@kadam.mountain>
References: <ba8becf4-786a-4923-92f7-b4ec3038295f@kadam.mountain>
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len and remain can never be negative in gdm_tty_write(). So remove such
a check and move the check of remaining bytes to the loop condition.
This way, the preceding 'if' is now superfluous too. Fix all that and
make the code cleaner.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc: linux-staging@lists.linux.dev
---
 drivers/staging/gdm724x/gdm_tty.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index cbaaa8fa7474..67d9bf41e836 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -158,10 +158,7 @@ static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 	if (!gdm_tty_ready(gdm))
 		return -ENODEV;
 
-	if (!len)
-		return 0;
-
-	while (1) {
+	while (remain) {
 		size_t sending_len = min(MUX_TX_MAX_SIZE, remain);
 		gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
 					(void *)(buf + sent_len),
@@ -171,8 +168,6 @@ static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 					gdm);
 		sent_len += sending_len;
 		remain -= sending_len;
-		if (remain <= 0)
-			break;
 	}
 
 	return len;
-- 
2.41.0