From: Salil Mehta <salil.mehta@xxxxxxxxxx>
Date: Sun, 3 Dec 2017 12:33:00 +0000
> +static int hclgevf_ring_space(struct hclgevf_cmq_ring *ring)
> +{
> + int ntu = ring->next_to_use;
> + int ntc = ring->next_to_clean;
> + int used = (ntu - ntc + ring->desc_num) % ring->desc_num;
Order local variables from longest to shortest line, please.
Audit your entire submission for this issue.
> +static int hclgevf_cmd_csq_done(struct hclgevf_hw *hw)
> +{
> + u32 head = hclgevf_read_dev(hw, HCLGEVF_NIC_CSQ_HEAD_REG);
> + return head == hw->cmq.csq.next_to_use;
> +}
Please return bool from this function.
> +void hclgevf_cmd_setup_basic_desc(struct hclgevf_desc *desc,
> + enum hclgevf_opcode_type opcode, bool is_read)
> +{
> + memset((void *)desc, 0, sizeof(struct hclgevf_desc));
You never need casts like this, when the functions argument is void any
pointer can be passed in as-is.
> +
> + /* If the command is sync, wait for the firmware to write back,
> + * if multi descriptors to be sent, use the first one to check
> + */
> + if (HCLGEVF_SEND_SYNC(le16_to_cpu(desc->flag))) {
> + do {
> + if (hclgevf_cmd_csq_done(hw))
> + break;
> + udelay(1);
> + timeout++;
> + } while (timeout < hw->cmq.tx_timeout);
> + }
This is potentially a long timeout with a spinlock held. Consider using
sleeping and completions.
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