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[v3,6/9] i2c: atr: allow replacing mappings in attach_addr()

Message ID 20250228151730.1874916-7-demonsingur@gmail.com
State New
Headers show
Series i2c: atr: allow usage of nested ATRs | expand

Commit Message

Cosmin Tanislav Feb. 28, 2025, 3:17 p.m. UTC 
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@gmail.com>
---
 drivers/i2c/i2c-atr.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
index b9d63efce8e3..80a76fe4bf51 100644
--- a/drivers/i2c/i2c-atr.c
+++ b/drivers/i2c/i2c-atr.c
@@ -539,6 +539,9 @@  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;