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Merge branch 'hwbm-locking-fixes'

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Gregory CLEMENT says:

====================
Fix spinlock usage in HWBM

these two patches fix spinlock related issues introduced in v4.6. They
have been reported by Russell King and Jean-Jacques Hiblot.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-05-25 12:35:09 -07:00
commit 217f97e856
2 changed files with 4 additions and 0 deletions
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1
drivers/net/ethernet/marvell/mvneta_bm.c
View file

@ -189,6 +189,7 @@ struct mvneta_bm_pool *mvneta_bm_pool_use(struct mvneta_bm *priv, u8 pool_id,
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
hwbm_pool->construct = mvneta_bm_construct;
hwbm_pool->priv = new_pool;
spin_lock_init(&hwbm_pool->lock);
/* Create new pool */
err = mvneta_bm_pool_create(priv, new_pool);

3
net/core/hwbm.c
View file

@ -55,18 +55,21 @@ int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
spin_lock_irqsave(&bm_pool->lock, flags);
if (bm_pool->buf_num == bm_pool->size) {
pr_warn("pool already filled\n");
spin_unlock_irqrestore(&bm_pool->lock, flags);
return bm_pool->buf_num;
}
if (buf_num + bm_pool->buf_num > bm_pool->size) {
pr_warn("cannot allocate %d buffers for pool\n",
buf_num);
spin_unlock_irqrestore(&bm_pool->lock, flags);
return 0;
}
if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) {
pr_warn("Adding %d buffers to the %d current buffers will overflow\n",
buf_num, bm_pool->buf_num);
spin_unlock_irqrestore(&bm_pool->lock, flags);
return 0;
}