[PATCH v2 7/9] i2c: atr: allow replacing mappings in attach_addr()

Cosmin Tanislav
2025-02-25T11:39:58Z

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(+)

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