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iavf: Fix handling of dummy receive descriptors 

Fix memory leak caused by not handling dummy receive descriptor properly.
iavf_get_rx_buffer now sets the rx_buffer return value for dummy receive
descriptors. Without this patch, when the hardware writes a dummy
descriptor, iavf would not free the page allocated for the previous receive
buffer. This is an unlikely event but can still happen.

[Jesse: massaged commit message]

Fixes: efa14c3985 ("iavf: allow null RX descriptors")
Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Przemyslaw Patynowski 2022-06-24 17:33:01 -07:00 committed by Tony Nguyen
parent 4635fd3a9d
commit a9f49e0060
1 changed files with 2 additions and 3 deletions
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5
drivers/net/ethernet/intel/iavf/iavf_txrx.c
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@ -1285,11 +1285,10 @@ static struct iavf_rx_buffer *iavf_get_rx_buffer(struct iavf_ring *rx_ring,
{ {
struct iavf_rx_buffer *rx_buffer; struct iavf_rx_buffer *rx_buffer;
if (!size)
return NULL;
rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean]; rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean];
prefetchw(rx_buffer->page); prefetchw(rx_buffer->page);
if (!size)
return rx_buffer;
/* we are reusing so sync this buffer for CPU use */ /* we are reusing so sync this buffer for CPU use */
dma_sync_single_range_for_cpu(rx_ring->dev, dma_sync_single_range_for_cpu(rx_ring->dev,