linux-kernel - [PATCH 5.4 003/177] nvme: Namepace identification descriptor list is optional

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Date:   Mon, 16 Dec 2019 18:47:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ingo Brunberg <ingo_brunberg@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...nel.org>
Subject: [PATCH 5.4 003/177] nvme: Namepace identification descriptor list is optional

From: Keith Busch <kbusch@...nel.org>

commit 22802bf742c25b1e2473c70b3b99da98af65ef4d upstream.

Despite NVM Express specification 1.3 requires a controller claiming to
be 1.3 or higher implement Identify CNS 03h (Namespace Identification
Descriptor list), the driver doesn't really need this identification in
order to use a namespace. The code had already documented in comments
that we're not to consider an error to this command.

Return success if the controller provided any response to an
namespace identification descriptors command.

Fixes: 538af88ea7d9de24 ("nvme: make nvme_report_ns_ids propagate error back")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=205679
Reported-by: Ingo Brunberg <ingo_brunberg@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: stable@...r.kernel.org # 5.4+
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/nvme/host/core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1727,6 +1727,8 @@ static int nvme_report_ns_ids(struct nvm
 		if (ret)
 			dev_warn(ctrl->device,
 				 "Identify Descriptors failed (%d)\n", ret);
+		if (ret > 0)
+			ret = 0;
 	}
 	return ret;
 }