linux-kernel - [PATCH] usb: storage: realtek_cr: Simplify rts51x_bulk

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Message-ID: <20250812144358.122154-1-thorsten.blum@linux.dev>
Date: Tue, 12 Aug 2025 16:43:58 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: storage: realtek_cr: Simplify rts51x_bulk_transport()

Change the function parameter 'buf_len' from 'int' to 'unsigned int' and
only update the local variable 'residue' if needed.

Update the rts51x_read_status() function signature accordingly.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 drivers/usb/storage/realtek_cr.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
index 7dea28c2b8ee..8a4d7c0f2662 100644
--- a/drivers/usb/storage/realtek_cr.c
+++ b/drivers/usb/storage/realtek_cr.c
@@ -199,7 +199,8 @@ static const struct us_unusual_dev realtek_cr_unusual_dev_list[] = {
 #undef UNUSUAL_DEV
 
 static int rts51x_bulk_transport(struct us_data *us, u8 lun,
-				 u8 *cmd, int cmd_len, u8 *buf, int buf_len,
+				 u8 *cmd, int cmd_len, u8 *buf,
+				 unsigned int buf_len,
 				 enum dma_data_direction dir, int *act_len)
 {
 	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *)us->iobuf;
@@ -260,8 +261,8 @@ static int rts51x_bulk_transport(struct us_data *us, u8 lun,
 	 * try to compute the actual residue, based on how much data
 	 * was really transferred and what the device tells us
 	 */
-	if (residue)
-		residue = residue < buf_len ? residue : buf_len;
+	if (residue > buf_len)
+		residue = buf_len;
 
 	if (act_len)
 		*act_len = buf_len - residue;
@@ -417,7 +418,7 @@ static int rts51x_write_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
 }
 
 static int rts51x_read_status(struct us_data *us,
-			      u8 lun, u8 *status, int len, int *actlen)
+			      u8 lun, u8 *status, unsigned int len, int *actlen)
 {
 	int retval;
 	u8 cmnd[12] = { 0 };
-- 
2.50.1