linux-kernel - Re: [[PATCH v1] 13/37] [CIFS] SMBD: Implement SMBD protocol negotiation

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Date:   Sun, 13 Aug 2017 03:22:25 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Long Li <longli@...hange.microsoft.com>
Cc:     Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
        Long Li <longli@...rosoft.com>
Subject: Re: [[PATCH v1] 13/37] [CIFS] SMBD: Implement SMBD protocol
 negotiation

> +	request = mempool_alloc(info->request_mempool, GFP_KERNEL);
> +	if (!request)
> +		return rc;

Here you do a mempool allocation to guarantee forward progress..

> +	request->sge = kzalloc(sizeof(struct ib_sge), GFP_KERNEL);
> +	if (!request->sge)
> +		goto allocate_sge_failed;

... and here it's a plain malloc in the same path, which renders the
above useless.  Also I would just embedd the sge into the containing
structure to avoid a memory allocation.

> +	request->info = info;
> +
> +	packet = (struct smbd_negotiate_req *) request->packet;
> +	packet->min_version = cpu_to_le16(0x100);
> +	packet->max_version = cpu_to_le16(0x100);

Canyou add a constant for the version code?

> +	packet->reserved = cpu_to_le16(0);

no need to byte swap 0 - you can always assign it directly.