On Fri, Feb 10, 2017 at 1:55 PM, Brian Norris <briannorris@xxxxxxxxxxxx> wrote:
> If we don't have an out-of-band wakeup IRQ configured through DT (as
> most platforms don't), then we fall out of this function with
> 'irq_wakeup == 0'. Other code (e.g., mwifiex_disable_wake() and
> mwifiex_enable_wake()) treats 'irq_wakeup >= 0' as a valid IRQ, and so
> we end up calling {enable,disable}_irq() on IRQ 0.
>
> That seems bad, so let's not do that.
>
> Same problem as fixed in this patch:
>
> https://patchwork.kernel.org/patch/9531693/
> [PATCH v2 2/3] btmrvl: set irq_bt to -1 when failed to parse it
>
> with the difference that:
> (a) this one is actually a regression and
> (b) this affects both device tree and non-device-tree systems
>
> While fixing the regression, also drop the verbosity on the parse
> failure, so we don't see this when a DT node is present but doesn't have
> an interrupt property (this is perfectly legal):
>
> [ 21.999000] mwifiex_pcie 0000:01:00.0: fail to parse irq_wakeup from device tree
>
> Fixes: 853402a00823 ("mwifiex: Enable WoWLAN for both sdio and pcie")
> Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Acked-by: Rajat Jain <rajatja@xxxxxxxxxx>
> ---
> This is a 4.10 regression. Not sure if it's critical to push quickly, or if it
> should just be tagged -stable and pushed in 4.11.
>
> drivers/net/wireless/marvell/mwifiex/main.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c
> index e5c3a8aa3929..c246d8efb6fc 100644
> --- a/drivers/net/wireless/marvell/mwifiex/main.c
> +++ b/drivers/net/wireless/marvell/mwifiex/main.c
> @@ -1569,13 +1569,13 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter)
> struct device *dev = adapter->dev;
>
> if (!dev->of_node)
> - return;
> + goto err_exit;
>
> adapter->dt_node = dev->of_node;
> adapter->irq_wakeup = irq_of_parse_and_map(adapter->dt_node, 0);
> if (!adapter->irq_wakeup) {
> - dev_info(dev, "fail to parse irq_wakeup from device tree\n");
> - return;
> + dev_dbg(dev, "fail to parse irq_wakeup from device tree\n");
> + goto err_exit;
> }
>
> ret = devm_request_irq(dev, adapter->irq_wakeup,
> @@ -1595,7 +1595,7 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter)
> return;
>
> err_exit:
> - adapter->irq_wakeup = 0;
> + adapter->irq_wakeup = -1;
> }
>
> /*
> --
> 2.11.0.483.g087da7b7c-goog
>
