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net: macb: Increment rx bd head after allocating skb and buffer 

In gem_rx_refill rx_prepared_head is incremented at the beginning of
the while loop preparing the skb and data buffers. If the skb or data
buffer allocation fails, this BD will be unusable BDs until the head
loops back to the same BD (and obviously buffer allocation succeeds).
In the unlikely event that there's a string of allocation failures,
there will be an equal number of unusable BDs and an inconsistent RX
BD chain. Hence increment the head at the end of the while loop to be
clean.

Fixes: 4df95131ea ("net/macb: change RX path for GEM")
Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220512171900.32593-1-harini.katakam@xilinx.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Harini Katakam 2022-05-12 22:49:00 +05:30 committed by Jakub Kicinski
parent d40dcaa4c9
commit 9500acc631
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/cadence/macb_main.c
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@ -1219,7 +1219,6 @@ static void gem_rx_refill(struct macb_queue *queue)
/* Make hw descriptor updates visible to CPU */
rmb();
queue->rx_prepared_head++;
desc = macb_rx_desc(queue, entry);
if (!queue->rx_skbuff[entry]) {
@ -1258,6 +1257,7 @@ static void gem_rx_refill(struct macb_queue *queue)
dma_wmb();
desc->addr &= ~MACB_BIT(RX_USED);
}
queue->rx_prepared_head++;
}
/* Make descriptor updates visible to hardware */