On Fri, Sep 23, 2011 at 06:38:02PM +0200, Julian Andres Klode wrote:
> Introduce two new functions nvec_msg_alloc() and nvec_msg_free()
> that allocate and free message buffers from the internal pool
> of messages.
>
> Signed-off-by: Julian Andres Klode <[email protected]>
> ---
> drivers/staging/nvec/nvec.c | 21 +++++++++++++++++++++
> drivers/staging/nvec/nvec.h | 6 ++++++
> 2 files changed, 27 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index 43a83a9..8a97241 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 +92,26 @@ static int nvec_status_notifier(struct notifier_block *nb,
> return NOTIFY_OK;
> }
>
> +static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec)
> +{
> + size_t i;
This should be "int i;" not "size_t i;" It's a number between 0 and
64. Also it would let you avoid the cast below.
Add a blank line between declarations and code.
> + for (i = 0; i < NVEC_POOL_SIZE; i++)
Put a '{' for multi-line blocks for style reasons even if it's not
needed for semantic reasons.
> + if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) {
> + dev_vdbg(nvec->dev, "INFO: Alloc %u\n", (uint) 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 %i\n", (int) (msg - nvec->msg_pool));
I don't have a cross compile environment set up so I can't compile
this, but surely (msg - nvec->msg_pool) generates some kind of
compile warning. I'd think you'd have to cast the struct pointers to
unsigned long or something. I'm not sure also what the printk tells
us.
> + atomic_set(&msg->used, 0);
> +}
regards,
dan carpenter
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