[PATCH] brcmfmac: Fix 'did not remove int handler' warning

[PATCH] brcmfmac: Fix 'did not remove int handler' warning

[Christian Daudt]

brcmf_sdiod_intr_unregister call that removes both func1 and
func2 interrupt handlers only called when brcmf_ops_sdio_remove
is called for func 1 (which is the 2nd call) but sdio is expecting
it to be removed at the end of each sdio_remove call.
This is causing 'rmmod bcmrfmac' on a 4356-sdio chip to complain
with:
WARNING: driver brcmfmac did not remove its interrupt handler!

The modification makes calling brcmf_sdiod_intr_unregister multiple
times harmless by clearing the variables that track if interrupt
handlers have been installed, and then calls it on every
brcmf_ops_sdio_remove call instead of just remove for func 1.

Note: this needs to be applied on top of
"[PATCH] Fix kernel oops in failed chip_attach"

Signed-off-by: Christian Daudt <csd@broadcom.com>
---
 .../net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c   | 17 +++++++++++------
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h |  2 +-
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
index 09635a9..590cd41 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -172,7 +172,7 @@ int brcmf_sdiod_intr_register(struct brcmf_sdio_dev *sdiodev)
 	return 0;
 }
 
-int brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev)
+void brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev)
 {
 
 	brcmf_dbg(SDIO, "Entering oob=%d sd=%d\n",
@@ -195,6 +195,7 @@ int brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev)
 		}
 		free_irq(pdata->oob_irq_nr, &sdiodev->func[1]->dev);
 		sdiodev->irq_en = false;
+		sdiodev->oob_irq_requested = false;
 	}
 
 	if (sdiodev->sd_irq_requested) {
@@ -202,9 +203,8 @@ int brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev)
 		sdio_release_irq(sdiodev->func[2]);
 		sdio_release_irq(sdiodev->func[1]);
 		sdio_release_host(sdiodev->func[1]);
+		sdiodev->sd_irq_requested = false;
 	}
-
-	return 0;
 }
 
 void brcmf_sdiod_change_state(struct brcmf_sdio_dev *sdiodev,
@@ -1200,12 +1200,17 @@ static void brcmf_ops_sdio_remove(struct sdio_func *func)
 	brcmf_dbg(SDIO, "sdio device ID: 0x%04x\n", func->device);
 	brcmf_dbg(SDIO, "Function: %d\n", func->num);
 
-	if (func->num != 1)
-		return;
-
 	bus_if = dev_get_drvdata(&func->dev);
 	if (bus_if) {
 		sdiodev = bus_if->bus_priv.sdio;
+
+		/* start by unregistering irqs */
+		brcmf_sdiod_intr_unregister(sdiodev);
+
+		if (func->num != 1)
+			return;
+
+		/* only proceed with rest of cleanup if func 1 */
 		brcmf_sdiod_remove(sdiodev);
 
 		dev_set_drvdata(&sdiodev->func[1]->dev, NULL);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
index c07ad25..f3da32f 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
@@ -294,7 +294,7 @@ struct sdpcmd_regs {
 
 /* Register/deregister interrupt handler. */
 int brcmf_sdiod_intr_register(struct brcmf_sdio_dev *sdiodev);
-int brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev);
+void brcmf_sdiod_intr_unregister(struct brcmf_sdio_dev *sdiodev);
 
 /* sdio device register access interface */
 u8 brcmf_sdiod_regrb(struct brcmf_sdio_dev *sdiodev, u32 addr, int *ret);
-- 
1.9.1

Re: [PATCH] brcmfmac: Fix 'did not remove int handler' warning

[Kalle Valo]

Christian Daudt <csd@broadcom.com> writes:

> brcmf_sdiod_intr_unregister call that removes both func1 and
> func2 interrupt handlers only called when brcmf_ops_sdio_remove
> is called for func 1 (which is the 2nd call) but sdio is expecting
> it to be removed at the end of each sdio_remove call.
> This is causing 'rmmod bcmrfmac' on a 4356-sdio chip to complain
> with:
> WARNING: driver brcmfmac did not remove its interrupt handler!
>
> The modification makes calling brcmf_sdiod_intr_unregister multiple
> times harmless by clearing the variables that track if interrupt
> handlers have been installed, and then calls it on every
> brcmf_ops_sdio_remove call instead of just remove for func 1.
>
> Note: this needs to be applied on top of
> "[PATCH] Fix kernel oops in failed chip_attach"

If you submit two patches at the same time, and where one patch depends
on another, it's best to submit them in the same series ([PATCH 1/2] and
[PATCH 2/2]). So please submit v2 as a series, I'm dropping this.

-- 
Kalle Valo