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thunderbolt: Use spinlock in ring serialization

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This makes it possible to enqueue frames also from atomic context which
is needed for example, when networking packets are sent over a
Thunderbolt cable.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mika Westerberg 2017-10-02 13:38:39 +03:00 committed by David S. Miller
parent 2a91ec63f8
commit 22b7de1000
2 changed files with 15 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/thunderbolt/nhi.c
View File

@ -212,8 +212,10 @@ static void ring_work(struct work_struct *work)
struct tb_ring *ring = container_of(work, typeof(*ring), work);
struct ring_frame *frame;
bool canceled = false;
unsigned long flags;
LIST_HEAD(done);
mutex_lock(&ring->lock);
spin_lock_irqsave(&ring->lock, flags);
if (!ring->running) {
/* Move all frames to done and mark them as canceled. */
@ -241,7 +243,8 @@ static void ring_work(struct work_struct *work)
ring_write_descriptors(ring);
invoke_callback:
mutex_unlock(&ring->lock); /* allow callbacks to schedule new work */
/* allow callbacks to schedule new work */
spin_unlock_irqrestore(&ring->lock, flags);
while (!list_empty(&done)) {
frame = list_first_entry(&done, typeof(*frame), list);
/*
@ -255,15 +258,17 @@ static void ring_work(struct work_struct *work)
int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
{
unsigned long flags;
int ret = 0;
mutex_lock(&ring->lock);
spin_lock_irqsave(&ring->lock, flags);
if (ring->running) {
list_add_tail(&frame->list, &ring->queue);
ring_write_descriptors(ring);
} else {
ret = -ESHUTDOWN;
}
mutex_unlock(&ring->lock);
spin_unlock_irqrestore(&ring->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(__tb_ring_enqueue);
@ -338,7 +343,7 @@ static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
if (!ring)
goto err;
mutex_init(&ring->lock);
spin_lock_init(&ring->lock);
INIT_LIST_HEAD(&ring->queue);
INIT_LIST_HEAD(&ring->in_flight);
INIT_WORK(&ring->work, ring_work);
@ -371,8 +376,6 @@ static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
return ring;
err:
if (ring)
mutex_destroy(&ring->lock);
kfree(ring);
mutex_unlock(&nhi->lock);
return NULL;
@ -419,7 +422,7 @@ void tb_ring_start(struct tb_ring *ring)
u32 flags;
mutex_lock(&ring->nhi->lock);
mutex_lock(&ring->lock);
spin_lock_irq(&ring->lock);
if (ring->nhi->going_away)
goto err;
if (ring->running) {
@ -466,7 +469,7 @@ void tb_ring_start(struct tb_ring *ring)
ring_interrupt_active(ring, true);
ring->running = true;
err:
mutex_unlock(&ring->lock);
spin_unlock_irq(&ring->lock);
mutex_unlock(&ring->nhi->lock);
}
EXPORT_SYMBOL_GPL(tb_ring_start);
@ -487,7 +490,7 @@ EXPORT_SYMBOL_GPL(tb_ring_start);
void tb_ring_stop(struct tb_ring *ring)
{
mutex_lock(&ring->nhi->lock);
mutex_lock(&ring->lock);
spin_lock_irq(&ring->lock);
dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n",
RING_TYPE(ring), ring->hop);
if (ring->nhi->going_away)
@ -508,7 +511,7 @@ void tb_ring_stop(struct tb_ring *ring)
ring->running = false;
err:
mutex_unlock(&ring->lock);
spin_unlock_irq(&ring->lock);
mutex_unlock(&ring->nhi->lock);
/*
@ -568,7 +571,6 @@ void tb_ring_free(struct tb_ring *ring)
* to finish before freeing the ring.
*/
flush_work(&ring->work);
mutex_destroy(&ring->lock);
kfree(ring);
}
EXPORT_SYMBOL_GPL(tb_ring_free);

2
include/linux/thunderbolt.h
View File

@ -448,7 +448,7 @@ struct tb_nhi {
* @eof_mask: Bit mask used to detect end of frame PDF
*/
struct tb_ring {
struct mutex lock;
spinlock_t lock;
struct tb_nhi *nhi;
int size;
int hop;