linux-kernel - [PATCH] lightnvm: do not load L2P table if not supported

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Message-Id: <1456932094-9808-1-git-send-email-javier@javigon.com>
Date:	Wed,  2 Mar 2016 16:21:34 +0100
From:	"Javier González" <jg@...htnvm.io>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: [PATCH] lightnvm: do not load L2P table if not supported

An Open-Channel SSD can work on two modes: (i) hybrid mode, where the
L2P table is maintained both by the host and by the device; and (ii)
full host-based, where the L2P table is uniquely maintained by the host.
The current rrpc target operates on hybrid mode.

In the advent of a new target implementing the full host-based mode, do
not assume that the L2P table must be loaded on the generic media
manager; check device properties loaded on the identify command instead.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/lightnvm/gennvm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 42c1c2a..0625d42 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -257,6 +257,9 @@ static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
 		}
 	}

+	if (!(dev->identity.dom & NVM_RSP_L2P))
+		return 0;
+
 	if (dev->ops->get_l2p_tbl) {
 		ret = dev->ops->get_l2p_tbl(dev, 0, dev->total_secs,
 							gennvm_block_map, dev);
-- 
2.5.0