linux-kernel - [PATCH v1] i3c: master: svc: Update actual read length

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Message-Id: <20250401063406.3728534-1-yschu@nuvoton.com>
Date: Tue,  1 Apr 2025 14:34:06 +0800
From: Stanley Chu <stanley.chuys@...il.com>
To: frank.li@....com,
	miquel.raynal@...tlin.com,
	alexandre.belloni@...tlin.com,
	linux-i3c@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	tomer.maimon@...oton.com,
	kwliu@...oton.com,
	yschu@...oton.com
Subject: [PATCH v1] i3c: master: svc: Update actual read length

From: Stanley Chu <yschu@...oton.com>

Some drivers, such as mctp-i3c.c, reuse the i3c_priv_xfer.len as
the actual read len. Therefore, the controller driver should also
update the i3c_priv_xfer.len after the read transfer is completed.

Signed-off-by: Stanley Chu <yschu@...oton.com>
---
 drivers/i3c/master/svc-i3c-master.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 85e16de208d3..dd520f5d4c9f 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -1470,9 +1470,16 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
 					  cmd->len, &cmd->actual_len,
 					  cmd->continued);
 		/* cmd->xfer is NULL if I2C or CCC transfer */
-		if (cmd->xfer)
+		if (cmd->xfer) {
 			cmd->xfer->actual_len = cmd->actual_len;
 
+			/*
+			 * Some i3c drivers reuse i3c_priv_xfer.len as
+			 * the actual read length.
+			 */
+			cmd->xfer->len = cmd->actual_len;
+		}
+
 		if (ret)
 			break;
 	}
-- 
2.34.1