linux-kernel - [PATCH v2 7/9] i2c: atr: allow replacing mappings in attach

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Message-ID: <20250225113939.49811-8-demonsingur@gmail.com>
Date: Tue, 25 Feb 2025 13:39:35 +0200
From: Cosmin Tanislav <demonsingur@...il.com>
To: 
Cc: Romain Gantois <romain.gantois@...tlin.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cosmin Tanislav <demonsingur@...il.com>
Subject: [PATCH v2 7/9] i2c: atr: allow replacing mappings in attach_addr()

It is possible for aliases to be exhausted while we are still attaching
children.

Allow replacing mapping on attach by calling
i2c_atr_replace_mapping_by_addr() if i2c_atr_create_mapping_by_addr()
fails.

Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
---
 drivers/i2c/i2c-atr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
index 5b53eaee0408..d8748d71ae15 100644
--- a/drivers/i2c/i2c-atr.c
+++ b/drivers/i2c/i2c-atr.c
@@ -543,6 +543,9 @@ static int i2c_atr_attach_addr(struct i2c_adapter *adapter,
 	mutex_lock(&chan->alias_pairs_lock);
 
 	c2a = i2c_atr_create_mapping_by_addr(chan, addr);
+	if (!c2a)
+		c2a = i2c_atr_replace_mapping_by_addr(chan, addr);
+
 	if (!c2a) {
 		dev_err(atr->dev, "failed to find a free alias\n");
 		ret = -EBUSY;
-- 
2.48.1