diff options
Diffstat (limited to 'drivers/staging/nvec/nvec.c')
| -rw-r--r-- | drivers/staging/nvec/nvec.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c index 43a83a953d4..fb0f51a2b0b 100644 --- a/drivers/staging/nvec/nvec.c +++ b/drivers/staging/nvec/nvec.c @@ -17,6 +17,7 @@ #include <asm/irq.h> +#include <linux/atomic.h> #include <linux/completion.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -91,6 +92,28 @@ static int nvec_status_notifier(struct notifier_block *nb, return NOTIFY_OK; } +static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec) +{ + int i; + + for (i = 0; i < NVEC_POOL_SIZE; i++) { + if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { + dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); + return &nvec->msg_pool[i]; + } + } + + dev_err(nvec->dev, "could not allocate buffer\n"); + + return NULL; +} + +static void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) +{ + dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); + atomic_set(&msg->used, 0); +} + void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, short size) { |