Hi Benjamin,
On Thu, 28 Jul 2016 11:50:43 +0200, Benjamin Tissoires wrote:
> i2c_handle_smbus_host_notify() returns 1 on success, something else on
> errors.
I did not notice before, but that doesn't make much sense IMHO. Your
function follows the "negative number on error" return model, so
returning the boolean value from schedule_work() doesn't look good.
Either you don't care about that value, and you should ignore it and
return 0 on success. Or you care and you should handle it in the
function. Right now value false/0 is in a gray zone, you don't consider
it as success according to the above comment, but you don't treat it as
an error in the code below either. I suppose it can't actually happen?
If so, I advise you don't check the value returned by schedule_work().
> There is a chance we get called while Host Notify is not available (yet),
> so we need to clear the Host Notify bit in those rare case.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-i801.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
> index a9b9bb4..f02b248 100644
> --- a/drivers/i2c/busses/i2c-i801.c
> +++ b/drivers/i2c/busses/i2c-i801.c
> @@ -578,12 +578,20 @@ static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
> {
> unsigned short addr;
> unsigned int data;
> + int ret;
> +
> + if (unlikely(!priv->host_notify))
> + goto out;
This covers the case where you get an interrupt before the handler is
installed. Good catch, I never considered it.
>
> addr = inb_p(SMBNTFDADD(priv)) >> 1;
> data = inw_p(SMBNTFDDAT(priv));
>
> - i2c_handle_smbus_host_notify(priv->host_notify, addr, data);
> + ret = i2c_handle_smbus_host_notify(priv->host_notify, addr, data);
> + if (ret < 0)
> + dev_warn(&priv->pci_dev->dev,
> + "Host Notify handling failed: %d\n", ret);
>
> +out:
> /* clear Host Notify bit and return */
> outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
> return IRQ_HANDLED;
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
--
Jean Delvare
SUSE L3 Support
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