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ibmvnic: Unmap DMA address of TX descriptor buffers after use

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There's no need to wait until a completion is received to unmap
TX descriptor buffers that have been passed to the hypervisor.
Instead unmap it when the hypervisor call has completed. This patch
avoids the possibility that a buffer will not be unmapped because
a TX completion is lost or mishandled.

Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Tested-by: Devesh K. Singh <devesh_singh@in.ibm.com>
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Falcon 2019-08-14 14:57:05 -05:00 committed by David S. Miller
parent 37b0a733c1
commit 80f0fe0934
1 changed files with 2 additions and 9 deletions
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11
drivers/net/ethernet/ibm/ibmvnic.c
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@ -1568,6 +1568,8 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
lpar_rc = send_subcrq_indirect(adapter, handle_array[queue_num],
(u64)tx_buff->indir_dma,
(u64)num_entries);
dma_unmap_single(dev, tx_buff->indir_dma,
sizeof(tx_buff->indir_arr), DMA_TO_DEVICE);
} else {
tx_buff->num_entries = num_entries;
lpar_rc = send_subcrq(adapter, handle_array[queue_num],
@ -2788,7 +2790,6 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
union sub_crq *next;
int index;
int i, j;
u8 *first;
restart_loop:
while (pending_scrq(adapter, scrq)) {
@ -2818,14 +2819,6 @@ restart_loop:
txbuff->data_dma[j] = 0;
}
/* if sub_crq was sent indirectly */
first = &txbuff->indir_arr[0].generic.first;
if (*first == IBMVNIC_CRQ_CMD) {
dma_unmap_single(dev, txbuff->indir_dma,
sizeof(txbuff->indir_arr),
DMA_TO_DEVICE);
*first = 0;
}
if (txbuff->last_frag) {
dev_kfree_skb_any(txbuff->skb);