Re: [PATCH] wireless: brcmfmac: initialize oob irq data before request_irq()

[Arend van Spriel <arend.vanspriel@broadcom.com>]

On 13-06-17 18:02, Michał Mirosław wrote:
> This fixes spin-forever in irq handler when IRQ is already asserted
> at request_irq() time.

With all the patchwork misery flying by I almost forgot to respond to
this. We suspect you are covering up a hardware issue here. At the time
of the request_irq() the device configuration for OOB is not yet done
and as such it is an input which makes the OOB line floating.

Can you tell me what platform you are seeing the spin-forever issue.
Could it be that is does not have a proper pull-up/down on the OOB irq line.

Could you try whether moving the request_irq() and enable_irq_wake()
calls further down after device configuration (see below) solve your
issue. Still it would be better to fix the hardware.

Regards,
Arend

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
b/drivers
index 9b970dc..e57a211 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -114,26 +114,11 @@ int brcmf_sdiod_intr_register(struct
brcmf_sdio_dev *sdiod
        if (pdata->oob_irq_supported) {
                brcmf_dbg(SDIO, "Enter, register OOB IRQ %d\n",
                          pdata->oob_irq_nr);
-               ret = request_irq(pdata->oob_irq_nr,
brcmf_sdiod_oob_irqhandler,
-                                 pdata->oob_irq_flags, "brcmf_oob_intr",
-                                 &sdiodev->func[1]->dev);
-               if (ret != 0) {
-                       brcmf_err("request_irq failed %d\n", ret);
-                       return ret;
-               }
-               sdiodev->oob_irq_requested = true;
                spin_lock_init(&sdiodev->irq_en_lock);
                spin_lock_irqsave(&sdiodev->irq_en_lock, flags);
                sdiodev->irq_en = true;
                spin_unlock_irqrestore(&sdiodev->irq_en_lock, flags);

-               ret = enable_irq_wake(pdata->oob_irq_nr);
-               if (ret != 0) {
-                       brcmf_err("enable_irq_wake failed %d\n", ret);
-                       return ret;
-               }
-               sdiodev->irq_wake = true;
-
                sdio_claim_host(sdiodev->func[1]);

                if (sdiodev->bus_if->chip == BRCM_CC_43362_CHIP_ID) {
@@ -161,6 +146,22 @@ int brcmf_sdiod_intr_register(struct brcmf_sdio_dev
*sdiode
                brcmf_sdiod_regwb(sdiodev, SDIO_CCCR_BRCM_SEPINT, data,
&ret);

                sdio_release_host(sdiodev->func[1]);
+
+               ret = request_irq(pdata->oob_irq_nr,
brcmf_sdiod_oob_irqhandler,
+                                 pdata->oob_irq_flags, "brcmf_oob_intr",
+                                 &sdiodev->func[1]->dev);
+               if (ret != 0) {
+                       brcmf_err("request_irq failed %d\n", ret);
+                       return ret;
+               }
+               sdiodev->oob_irq_requested = true;
+
+               ret = enable_irq_wake(pdata->oob_irq_nr);
+               if (ret != 0) {
+                       brcmf_err("enable_irq_wake failed %d\n", ret);
+                       return ret;
+               }
+               sdiodev->irq_wake = true;
        } else {
                brcmf_dbg(SDIO, "Entering\n");
                sdio_claim_host(sdiodev->func[1]);