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SubjectRe: [PATCH] driver: firmware: stratix10-svc: schedule thread out when there is no data reveived
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On 11/9/21 1:46 AM, Meng Li wrote:
> From: Meng Li <meng.li@windriver.com>
>
> In thread svc_normal_to_secure_thread(), function kfifo_out_spinlocked()
> always return, so this thread can't release cpu even if there is no data
> received, and cause cpu is under heave load status. System performance

do you mean "heavy"?

> is poor.
>
> This issue is introduced by commit 7ca5ce896524("firmware: add Intel
> Stratix10 service layer driver")
>
> Therefore, schedule this thread out when there is no data reveived, and

s/reveived/received

> wake it up after sending data to it.
>
> Fixes: 7ca5ce896524 ("firmware: add Intel Stratix10 service layer driver")
> Cc: stable@vger.kernel.org
> Signed-off-by: Meng Li <Meng.Li@windriver.com>
> ---
> drivers/firmware/stratix10-svc.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
> index 2a7687911c09..ddb86d441726 100644
> --- a/drivers/firmware/stratix10-svc.c
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -365,8 +365,10 @@ static int svc_normal_to_secure_thread(void *data)
> pdata, sizeof(*pdata),
> &ctrl->svc_fifo_lock);
>
> - if (!ret_fifo)
> + if (!ret_fifo) {
> + schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
> continue;
> + }
>
> pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n",
> (unsigned int)pdata->paddr, pdata->command,
> @@ -861,6 +863,7 @@ int stratix10_svc_send(struct stratix10_svc_chan *chan, void *msg)
> ret = kfifo_in_spinlocked(&chan->ctrl->svc_fifo, p_data,
> sizeof(*p_data),
> &chan->ctrl->svc_fifo_lock);
> + wake_up_process(chan->ctrl->task);
>
> kfree(p_data);
>
>

I've made above spelling fixes and have applied it.

Thanks,
Dinh

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