Convert to the much saner new idr interface.
Only compile tested.
v2: The original conversion accidentally dropped a call to
i2c_register_adapter() in i2c_add_numbered_adapter() leaving @adap
uninitialized and unregistered. Reported by Mark Brown. Fix it.
Signed-off-by: Tejun Heo <t...@kernel.org>
Reported-by: Mark Brown <broo...@opensource.wolfsonmicro.com>
Cc: Jean Delvare <kh...@linux-fr.org>
Cc: linux-...@vger.kernel.org
---
Heh, this is embarrassing. I got too focused on the id allocation
itself and missed moving i2c_register_adapter() call.
I think this should fix the problem you're seeing. Can you please
test this?
Thank you.
drivers/i2c/i2c-core.c | 43 ++++++++++---------------------------------
1 file changed, 10 insertions(+), 33 deletions(-)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -935,25 +935,16 @@ out_list:
*/
int i2c_add_adapter(struct i2c_adapter *adapter)
{
- int id, res = 0;
-
-retry:
- if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0)
- return -ENOMEM;
+ int res;
mutex_lock(&core_lock);
- /* "above" here means "above or equal to", sigh */
- res = idr_get_new_above(&i2c_adapter_idr, adapter,
- __i2c_first_dynamic_bus_num, &id);
+ res = idr_alloc(&i2c_adapter_idr, adapter,
+ __i2c_first_dynamic_bus_num, 0, GFP_KERNEL);
mutex_unlock(&core_lock);
-
- if (res < 0) {
- if (res == -EAGAIN)
- goto retry;
+ if (res < 0)
return res;
- }
- adapter->nr = id;
+ adapter->nr = res;
return i2c_register_adapter(adapter);
}
EXPORT_SYMBOL(i2c_add_adapter);
@@ -984,33 +975,19 @@ EXPORT_SYMBOL(i2c_add_adapter);
int i2c_add_numbered_adapter(struct i2c_adapter *adap)
{
int id;
- int status;
if (adap->nr == -1) /* -1 means dynamically assign bus id */
return i2c_add_adapter(adap);
if (adap->nr & ~MAX_IDR_MASK)
return -EINVAL;
-retry:
- if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0)
- return -ENOMEM;
-
mutex_lock(&core_lock);
- /* "above" here means "above or equal to", sigh;
- * we need the "equal to" result to force the result
- */
- status = idr_get_new_above(&i2c_adapter_idr, adap, adap->nr, &id);
- if (status == 0 && id != adap->nr) {
- status = -EBUSY;
- idr_remove(&i2c_adapter_idr, id);
- }
+ id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, adap->nr + 1,
+ GFP_KERNEL);
mutex_unlock(&core_lock);
- if (status == -EAGAIN)
- goto retry;
-
- if (status == 0)
- status = i2c_register_adapter(adap);
- return status;
+ if (id < 0)
+ return id == -ENOSPC ? -EBUSY : id;
+ return i2c_register_adapter(adap);
}
EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
--
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