[PATCH 4.11 37/58] brcmfmac: unbind all devices upon failure in firmware callback

Greg Kroah-Hartman
2017-06-27T14:16:37Z

From: Arend Van Spriel <arend.vanspriel@broadcom.com>

commit 7a51461fc2da82a6c565a3ee65c41c197f28225d upstream.

When request firmware fails, brcmf_ops_sdio_remove is being called and
brcmf_bus freed. In such circumstancies if you do a suspend/resume cycle
the kernel hangs on resume due a NULL pointer dereference in resume
function. So in brcmf_sdio_firmware_callback() we need to unbind the
driver from both sdio_func devices when firmware load failure is indicated.

Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -3986,14 +3986,14 @@ static void brcmf_sdio_firmware_callback
u8 saveclk;

brcmf_dbg(TRACE, "Enter: dev=%s, err=%d\n", dev_name(dev), err);
+ bus_if = dev_get_drvdata(dev);
+ sdiodev = bus_if->bus_priv.sdio;
if (err)
goto fail;

- bus_if = dev_get_drvdata(dev);
if (!bus_if->drvr)
return;

- sdiodev = bus_if->bus_priv.sdio;
bus = sdiodev->bus;

/* try to download image and nvram to the dongle */
@@ -4082,6 +4082,7 @@ release:
fail:
brcmf_dbg(TRACE, "failed: dev=%s, err=%d\n", dev_name(dev), err);
device_release_driver(dev);
+ device_release_driver(&sdiodev->func[2]->dev);
}

struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)