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SubjectRe: [PATCH RFC 1/3] lightnvm: check mm before use
From
2015-12-02 20:16 GMT+08:00 Matias Bjørling <m@bjorling.me>:
> The core can initialize I/Os before a media manager is registered with
> the lightnvm subsystem. Make sure that we don't call the media manager
> prematurely.
>
> Signed-off-by: Matias Bjørling <m@bjorling.me>
> ---
> drivers/nvme/host/lightnvm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
> index 06c3364..762c9a7 100644
> --- a/drivers/nvme/host/lightnvm.c
> +++ b/drivers/nvme/host/lightnvm.c
> @@ -455,7 +455,7 @@ static void nvme_nvm_end_io(struct request *rq, int error)
> struct nvm_rq *rqd = rq->end_io_data;
> struct nvm_dev *dev = rqd->dev;
>
> - if (dev->mt->end_io(rqd, error))
> + if (dev->mt && dev->mt->end_io(rqd, error))

Is there any chance core can initialize IOs on device without register
with a media manger ?
In my understanding core cannot create target on device without a
media manger, if core doesn't have a target how can core initialize
IOs on these devices? If I'm wrong about this, please correct me.


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