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SubjectRe: [PATCH] firmware: stratix10-rsu: prevent io block when sending RSU messages
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On 7/4/23 21:18, kah.jing.lee@intel.com wrote:
> From: Kah Jing Lee <kah.jing.lee@intel.com>
>
> Fix the issue for preventing recursive rsu mutex lock
> issue in RSU update command.

This message is a bit confusing. What "issue" is preventing a lock issue?

>
> Signed-off-by: Kah Jing Lee <kah.jing.lee@intel.com>
> ---
> drivers/firmware/stratix10-rsu.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/stratix10-rsu.c b/drivers/firmware/stratix10-rsu.c
> index e51c95f8d445..0a7542e9bb6f 100644
> --- a/drivers/firmware/stratix10-rsu.c
> +++ b/drivers/firmware/stratix10-rsu.c
> @@ -280,7 +280,9 @@ static int rsu_send_msg(struct stratix10_rsu_priv *priv,
> struct stratix10_svc_client_msg msg;
> int ret;
>
> - mutex_lock(&priv->lock);
> + if (!mutex_trylock(&priv->lock))
> + return -EAGAIN;
> +
> reinit_completion(&priv->completion);
> priv->client.receive_cb = callback;
>
> @@ -525,7 +527,9 @@ static ssize_t reboot_image_store(struct device *dev,
>
> ret = rsu_send_msg(priv, COMMAND_RSU_UPDATE,
> address, rsu_command_callback);
> - if (ret) {
> + if (ret == -EAGAIN)
> + return 0;
> + else if (ret) {
> dev_err(dev, "Error, RSU update returned %i\n", ret);
> return ret;
> }

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