lightnvm: simplify geometry enumeration

Currently the geometry of an OCSSD is enumerated using a two step
approach:

First, nvm_register is called, the OCSSD identify command is issued,
and second the geometry sos and csecs values are read either from the
OCSSD identify if it is a 1.2 drive, or from the NVMe namespace data
structure if it is a 2.0 device.

This patch recombines it into a single step, such that nvm_register can
use the csecs and sos fields independent of which version is used. This
enables one to dynamically size the lightnvm subsystem dma pool.

Reviewed-by: Igor Konopko <igor.j.konopko@intel.com>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 10e541cb8dc3..69b841d682c7 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -1145,25 +1145,23 @@ int nvm_register(struct nvm_dev *dev)
 	if (!dev->q || !dev->ops)
 		return -EINVAL;
 
+	ret = nvm_init(dev);
+	if (ret)
+		return ret;
+
 	dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
 	if (!dev->dma_pool) {
 		pr_err("nvm: could not create dma pool\n");
+		nvm_free(dev);
 		return -ENOMEM;
 	}
 
-	ret = nvm_init(dev);
-	if (ret)
-		goto err_init;
-
 	/* register device with a supported media manager */
 	down_write(&nvm_lock);
 	list_add(&dev->devices, &nvm_devices);
 	up_write(&nvm_lock);
 
 	return 0;
-err_init:
-	dev->ops->destroy_dma_pool(dev->dma_pool);
-	return ret;
 }
 EXPORT_SYMBOL(nvm_register);