[PATCH v2 3/8] RDMA/device: Call ib_cache_release_one() only from ib_device_release()

[Jason Gunthorpe <jgg@xxxxxxxx>]

From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>

Instead of complicated logic about when this memory is freed, always free
it during device release(). All the cache pointers start out as NULL, so
it is safe to call this before the cache is initialized.

This makes for a simpler error unwind flow, and a simpler understanding of
the lifetime of the memory allocations inside the struct ib_device.

Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
 drivers/infiniband/core/cache.c  |  3 +++
 drivers/infiniband/core/device.c | 41 ++++++++++----------------------
 2 files changed, 15 insertions(+), 29 deletions(-)

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 7b04590f307f52..2338d0b3a0cab8 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -1460,6 +1460,9 @@ void ib_cache_release_one(struct ib_device *device)
 {
 	int p;
 
+	if (!device->cache.ports)
+		return;
+
 	/*
 	 * The release function frees all the cache elements.
 	 * This function should be called as part of freeing
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 3455a3b5d0d1a8..803df192b7750e 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -244,17 +244,10 @@ static void ib_device_release(struct device *device)
 	struct ib_device *dev = container_of(device, struct ib_device, dev);
 
 	WARN_ON(dev->reg_state == IB_DEV_REGISTERED);
-	if (dev->reg_state == IB_DEV_UNREGISTERED) {
-		/*
-		 * In IB_DEV_UNINITIALIZED state, cache or port table
-		 * is not even created. Free cache and port table only when
-		 * device reaches UNREGISTERED state.
-		 */
-		ib_cache_release_one(dev);
-		kfree(dev->port_immutable);
-	}
+	ib_cache_release_one(dev);
 	ib_security_release_port_pkey_list(dev);
 	kfree(dev->port_pkey_list);
+	kfree(dev->port_immutable);
 	kfree(dev);
 }
 
@@ -519,13 +512,6 @@ static void setup_dma_device(struct ib_device *device)
 	}
 }
 
-static void cleanup_device(struct ib_device *device)
-{
-	ib_cache_cleanup_one(device);
-	ib_cache_release_one(device);
-	kfree(device->port_immutable);
-}
-
 static int setup_device(struct ib_device *device)
 {
 	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
@@ -547,26 +533,16 @@ static int setup_device(struct ib_device *device)
 	if (ret) {
 		dev_warn(&device->dev,
 			 "Couldn't query the device attributes\n");
-		goto port_cleanup;
+		return ret;
 	}
 
 	ret = setup_port_pkey_list(device);
 	if (ret) {
 		dev_warn(&device->dev, "Couldn't create per port_pkey_list\n");
-		goto port_cleanup;
-	}
-
-	ret = ib_cache_setup_one(device);
-	if (ret) {
-		dev_warn(&device->dev,
-			 "Couldn't set up InfiniBand P_Key/GID cache\n");
 		return ret;
 	}
-	return 0;
 
-port_cleanup:
-	kfree(device->port_immutable);
-	return ret;
+	return 0;
 }
 
 /**
@@ -606,6 +582,13 @@ int ib_register_device(struct ib_device *device, const char *name)
 	if (ret)
 		goto out;
 
+	ret = ib_cache_setup_one(device);
+	if (ret) {
+		dev_warn(&device->dev,
+			 "Couldn't set up InfiniBand P_Key/GID cache\n");
+		goto out;
+	}
+
 	device->index = __dev_new_index();
 
 	ib_device_register_rdmacg(device);
@@ -632,7 +615,7 @@ int ib_register_device(struct ib_device *device, const char *name)
 
 cg_cleanup:
 	ib_device_unregister_rdmacg(device);
-	cleanup_device(device);
+	ib_cache_cleanup_one(device);
 out:
 	mutex_unlock(&device_mutex);
 	return ret;
-- 
2.20.1