[PATCH v1] i2c: i2c-core-base: Modify the maximum idr id for i2c adapter

Riwen Lu
2022-12-16T02:08:07Z

From: Riwen Lu <luriwen@kylinos.cn>

Change the maximum idr ID to INT_MAX for i2c adapter.
This fix the following adding i2c adapter error while the idr with
adap->nr has been allocated by other i2c driver, and find a proper ID
for it.
[ 357.620685][ 3] [ T3655] ------------[ cut here ]------------
[ 357.626544][ 3] [ T3655] couldn't get idr

Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
---
drivers/i2c/i2c-core-base.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 7539b0740351..c2982861057a 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1535,11 +1535,12 @@ static int __i2c_add_numbered_adapter(struct i2c_adapter *adap)
int id;

mutex_lock(&core_lock);
- id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, adap->nr + 1, GFP_KERNEL);
+ id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, 0, GFP_KERNEL);
mutex_unlock(&core_lock);
if (WARN(id < 0, "couldn't get idr"))
return id == -ENOSPC ? -EBUSY : id;

+ adap->nr = id;
return i2c_register_adapter(adap);
}

--
2.25.1