linux-kernel - Re: [PATCH v7 1/5] lightnvm: Support for Open-Channel SSDs

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Date:	Fri, 04 Sep 2015 10:05:14 +0200
From:	Matias Bjørling <m@...rling.me>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>, hch@...radead.org,
	axboe@...com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
CC:	jg@...htnvm.io, Stephen.Bates@...s.com, keith.busch@...el.com,
	Matias Bjørling <mb@...htnvm.io>
Subject: Re: [PATCH v7 1/5] lightnvm: Support for Open-Channel SSDs

>
> So here is a suggestion, register_bm again
> if we found nvm_dev->bm == NULL in create_target(). And if it is still
> NULL after that. return an error "nvm: no compatible bm was found"
> and stop target creating. Otherwise, there would be a NULL Pointer
> reference problem.
>
> That's a real problem I met in my testing and I did this change
> in my local using. I hope that's useful to you.
>
Hi Yang,

Similar to this?

diff --git i/drivers/lightnvm/core.c w/drivers/lightnvm/core.c
index 5e4c2b8..0d2e5e3 100644
--- i/drivers/lightnvm/core.c
+++ w/drivers/lightnvm/core.c
@@ -262,8 +262,9 @@ int nvm_init(struct nvm_dev *dev)
         }

         if (!ret) {
-               pr_info("nvm: no compatible bm was found.\n");
-               return 0;
+               pr_info("nvm: %s was not initialized due to no 
compatible bm.\n",
+                                                               dev->name);
+               return -EINVAL;
         }

         pr_info("nvm: registered %s with luns: %u blocks: %lu sector 
size: %d\n",



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