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dpaa_eth: fix DMA mapping leak

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On the error path some fragments remain DMA mapped. Adding a fix
that unmaps all the fragments. Rework cleanup path to be simpler.

Fixes: 8151ee88ba ("dpaa_eth: use page backed rx buffers")
Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madalin Bucur 2019-12-23 09:39:22 +02:00 committed by David S. Miller
parent ec34c01575
commit c27569fcd6
1 changed files with 20 additions and 19 deletions
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33
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
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@ -1719,7 +1719,7 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
int page_offset;
unsigned int sz;
int *count_ptr;
int i;
int i, j;
vaddr = phys_to_virt(addr);
WARN_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));
@ -1736,14 +1736,14 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
WARN_ON(!IS_ALIGNED((unsigned long)sg_vaddr,
SMP_CACHE_BYTES));
dma_unmap_page(priv->rx_dma_dev, sg_addr,
DPAA_BP_RAW_SIZE, DMA_FROM_DEVICE);
/* We may use multiple Rx pools */
dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
if (!dpaa_bp)
goto free_buffers;
count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
dma_unmap_page(priv->rx_dma_dev, sg_addr,
DPAA_BP_RAW_SIZE, DMA_FROM_DEVICE);
if (!skb) {
sz = dpaa_bp->size +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
@ -1786,7 +1786,9 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
skb_add_rx_frag(skb, i - 1, head_page, frag_off,
frag_len, dpaa_bp->size);
}
/* Update the pool count for the current {cpu x bpool} */
count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
(*count_ptr)--;
if (qm_sg_entry_is_final(&sgt[i]))
@ -1800,26 +1802,25 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
return skb;
free_buffers:
/* compensate sw bpool counter changes */
for (i--; i >= 0; i--) {
dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
if (dpaa_bp) {
count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
(*count_ptr)++;
}
}
/* free all the SG entries */
for (i = 0; i < DPAA_SGT_MAX_ENTRIES ; i++) {
sg_addr = qm_sg_addr(&sgt[i]);
for (j = 0; j < DPAA_SGT_MAX_ENTRIES ; j++) {
sg_addr = qm_sg_addr(&sgt[j]);
sg_vaddr = phys_to_virt(sg_addr);
/* all pages 0..i were unmaped */
if (j > i)
dma_unmap_page(priv->rx_dma_dev, qm_sg_addr(&sgt[j]),
DPAA_BP_RAW_SIZE, DMA_FROM_DEVICE);
free_pages((unsigned long)sg_vaddr, 0);
dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
/* counters 0..i-1 were decremented */
if (j >= i) {
dpaa_bp = dpaa_bpid2pool(sgt[j].bpid);
if (dpaa_bp) {
count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
(*count_ptr)--;
}
}
if (qm_sg_entry_is_final(&sgt[i]))
if (qm_sg_entry_is_final(&sgt[j]))
break;
}
/* free the SGT fragment */