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dpaa_eth: avoid uninitialized variable false-positive warning

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We can now build this driver on ARM, so I ran into a randconfig build
warning that presumably had existed on powerpc already.

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c: In function 'sg_fd_to_skb':
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c:1712:18: error: 'skb' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I'm slightly changing the logic here, to make it obvious to the
compiler that 'skb' is always initialized.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2017-11-03 13:52:24 +01:00 committed by David S. Miller
parent 727d5fbbad
commit f21506cb42
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
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@ -1721,6 +1721,7 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
/* Iterate through the SGT entries and add data buffers to the skb */ /* Iterate through the SGT entries and add data buffers to the skb */
sgt = vaddr + fd_off; sgt = vaddr + fd_off;
skb = NULL;
for (i = 0; i < DPAA_SGT_MAX_ENTRIES; i++) { for (i = 0; i < DPAA_SGT_MAX_ENTRIES; i++) {
/* Extension bit is not supported */ /* Extension bit is not supported */
WARN_ON(qm_sg_entry_is_ext(&sgt[i])); WARN_ON(qm_sg_entry_is_ext(&sgt[i]));
@ -1738,7 +1739,7 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
count_ptr = this_cpu_ptr(dpaa_bp->percpu_count); count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
dma_unmap_single(dpaa_bp->dev, sg_addr, dpaa_bp->size, dma_unmap_single(dpaa_bp->dev, sg_addr, dpaa_bp->size,
DMA_FROM_DEVICE); DMA_FROM_DEVICE);
if (i == 0) { if (!skb) {
sz = dpaa_bp->size + sz = dpaa_bp->size +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
skb = build_skb(sg_vaddr, sz); skb = build_skb(sg_vaddr, sz);