linux-kernel - [PATCH] i3c: master: adi: fix number of bytes written to fifo

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Message-ID: <20250924195600.122142-1-alexandre.belloni@bootlin.com>
Date: Wed, 24 Sep 2025 21:56:00 +0200
From: alexandre.belloni@...tlin.com
To: Jorge Marques <jorge.marques@...log.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Frank Li <Frank.Li@....com>
Cc: kernel test robot <lkp@...el.com>,
	linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i3c: master: adi: fix number of bytes written to fifo

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

adi_i3c_master_wr_to_tx_fifo computes the maximum number of bytes that can be
sent to the fifo but never makes use of it, actually limit the number of bytes
sent.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509190505.fKGvEJRa-lkp@intel.com/
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/i3c/master/adi-i3c-master.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i3c/master/adi-i3c-master.c b/drivers/i3c/master/adi-i3c-master.c
index 18597ba1f1c3..82ac0b3d057a 100644
--- a/drivers/i3c/master/adi-i3c-master.c
+++ b/drivers/i3c/master/adi-i3c-master.c
@@ -135,7 +135,7 @@ static void adi_i3c_master_wr_to_tx_fifo(struct adi_i3c_master *master,
 
 	n = readl(master->regs + REG_SDO_FIFO_ROOM);
 	m = min(n, nbytes);
-	i3c_writel_fifo(master->regs + REG_SDO_FIFO, buf, nbytes);
+	i3c_writel_fifo(master->regs + REG_SDO_FIFO, buf, m);
 }
 
 static void adi_i3c_master_rd_from_rx_fifo(struct adi_i3c_master *master,
-- 
2.51.0