linux-kernel - [PATCH v1 1/1] i3c: master: svc: Fix i3c_master_get_free

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Message-Id: <20250310023304.2335792-1-yschu@nuvoton.com>
Date: Mon, 10 Mar 2025 10:33:04 +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,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH v1 1/1] i3c: master: svc: Fix i3c_master_get_free_addr return check

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

The return value of i3c_master_get_free_addr is assigned to a variable
with wrong type, so it can't be negative. Use a signed integer for the
return value. If the value is negative, break the process and propagate
the error code.

This commit also fixes the uninitialized symbol 'dyn_addr', reported
by Smatch static checker.

Fixes: 4008a74e0f9b ("i3c: master: svc: Fix npcm845 FIFO empty issue")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/all/029e5ac0-5444-4a8e-bca4-cec55950d2b9@stanley.mountain/
Signed-off-by: Stanley Chu <yschu@...oton.com>
---
 drivers/i3c/master/svc-i3c-master.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index f22fb9e75142..1d1f351b9a85 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -940,7 +940,7 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 					u8 *addrs, unsigned int *count)
 {
 	u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0;
-	unsigned int dev_nb = 0, last_addr = 0, dyn_addr;
+	unsigned int dev_nb = 0, last_addr = 0, dyn_addr = 0;
 	u32 reg;
 	int ret, i;
 
@@ -998,10 +998,11 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 			 * filling within a few hundred nanoseconds, which is significantly
 			 * faster compared to the 64 SCL clock cycles.
 			 */
-			dyn_addr = i3c_master_get_free_addr(&master->base, last_addr + 1);
-			if (dyn_addr < 0)
-				return -ENOSPC;
+			ret = i3c_master_get_free_addr(&master->base, last_addr + 1);
+			if (ret < 0)
+				break;
 
+			dyn_addr = ret;
 			writel(dyn_addr, master->regs + SVC_I3C_MWDATAB);
 
 			/*
-- 
2.34.1