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net: hwbm: Make the hwbm_pool lock a mutex 

Based on review, `lock' is only acquired in hwbm_pool_add() which is
invoked via ->probe(), ->resume() and ->ndo_change_mtu(). Based on this
the lock can become a mutex and there is no need to disable interrupts
during the procedure.
Now that the lock is a mutex, hwbm_pool_add() no longer invokes
hwbm_pool_refill() in an atomic context so we can pass GFP_KERNEL to
hwbm_pool_refill() and remove the `gfp' argument from hwbm_pool_add().

Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sebastian Andrzej Siewior 2019-06-07 21:20:40 +02:00 committed by David S. Miller
parent 49eef82dcd
commit 6dcdd884e2
4 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/marvell/mvneta.c
View File

@ -1119,7 +1119,7 @@ static void mvneta_bm_update_mtu(struct mvneta_port *pp, int mtu)
SKB_DATA_ALIGN(MVNETA_RX_BUF_SIZE(bm_pool->pkt_size));
/* Fill entire long pool */
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size, GFP_ATOMIC);
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size);
if (num != hwbm_pool->size) {
WARN(1, "pool %d: %d of %d allocated\n",
bm_pool->id, num, hwbm_pool->size);

4
drivers/net/ethernet/marvell/mvneta_bm.c
View File

@ -190,7 +190,7 @@ 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);
mutex_init(&hwbm_pool->buf_lock);
/* Create new pool */
err = mvneta_bm_pool_create(priv, new_pool);
@ -201,7 +201,7 @@ struct mvneta_bm_pool *mvneta_bm_pool_use(struct mvneta_bm *priv, u8 pool_id,
}
/* Allocate buffers for this pool */
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size, GFP_ATOMIC);
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size);
if (num != hwbm_pool->size) {
WARN(1, "pool %d: %d of %d allocated\n",
new_pool->id, num, hwbm_pool->size);

6
include/net/hwbm.h
View File

@ -12,18 +12,18 @@ struct hwbm_pool {
/* constructor called during alocation */
int (*construct)(struct hwbm_pool *bm_pool, void *buf);
/* protect acces to the buffer counter*/
spinlock_t lock;
struct mutex buf_lock;
/* private data */
void *priv;
};
#ifdef CONFIG_HWBM
void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf);
int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp);
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp);
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num);
#else
void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) {}
int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) { return 0; }
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num)
{ return 0; }
#endif /* CONFIG_HWBM */
#endif /* _HWBM_H */

15
net/core/hwbm.c
View File

@ -43,34 +43,33 @@ int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(hwbm_pool_refill);
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num)
{
int err, i;
unsigned long flags;
spin_lock_irqsave(&bm_pool->lock, flags);
mutex_lock(&bm_pool->buf_lock);
if (bm_pool->buf_num == bm_pool->size) {
pr_warn("pool already filled\n");
spin_unlock_irqrestore(&bm_pool->lock, flags);
mutex_unlock(&bm_pool->buf_lock);
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);
mutex_unlock(&bm_pool->buf_lock);
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);
mutex_unlock(&bm_pool->buf_lock);
return 0;
}
for (i = 0; i < buf_num; i++) {
err = hwbm_pool_refill(bm_pool, gfp);
err = hwbm_pool_refill(bm_pool, GFP_KERNEL);
if (err < 0)
break;
}
@ -79,7 +78,7 @@ int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
bm_pool->buf_num += i;
pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num);
spin_unlock_irqrestore(&bm_pool->lock, flags);
mutex_unlock(&bm_pool->buf_lock);
return i;
}