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net: hns3: bugfix for is_valid_csq_clean_head() 

The HEAD pointer of the hardware command queue maybe equal to the command
queue's next_to_use in the driver, so that does not belong to the invalid
HEAD pointer, since the hardware may not process the command in time,
causing the HEAD pointer to be too late to update. The variables' name
in this function is unreadable, so give them a more readable one.

Fixes: 3ff504908f ("net: hns3: fix a dead loop in hclge_cmd_csq_clean")
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Huazhong Tan 2018-10-30 21:50:48 +08:00 committed by David S. Miller
parent 5faaf0752a
commit 6d71ec6cbf
1 changed files with 6 additions and 6 deletions
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12
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
View File

@ -24,15 +24,15 @@ static int hclge_ring_space(struct hclge_cmq_ring *ring)
return ring->desc_num - used - 1;
}
static int is_valid_csq_clean_head(struct hclge_cmq_ring *ring, int h)
static int is_valid_csq_clean_head(struct hclge_cmq_ring *ring, int head)
{
int u = ring->next_to_use;
int c = ring->next_to_clean;
int ntu = ring->next_to_use;
int ntc = ring->next_to_clean;
if (unlikely(h >= ring->desc_num))
return 0;
if (ntu > ntc)
return head >= ntc && head <= ntu;
return u > c ? (h > c && h <= u) : (h > c || h <= u);
return head >= ntc || head <= ntu;
}
static int hclge_alloc_cmd_desc(struct hclge_cmq_ring *ring)