libertas sdio: fix suspend when interface is down

When the interface is down, the hardware is powered off.
However, the suspend handler currently tries to send host sleep commands
(when wakeup params are set) in this configuration, causing a system hang
when going into suspend (the commands will never complete).

Avoid this by detecting this situation and simply returning from
the suspend handler without doing anything special.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index e970897f6ab52370a632a64a62cc10bb3c39a3c6..4cb234349fbfacc305b1565ed5f1a30ba16aa108 100644 (file)
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -1326,6 +1326,11 @@ static int if_sdio_suspend(struct device *dev)
 
        mmc_pm_flag_t flags = sdio_get_host_pm_caps(func);
 
+       /* If we're powered off anyway, just let the mmc layer remove the
+        * card. */
+       if (!lbs_iface_active(card->priv))
+               return -ENOSYS;
+
        dev_info(dev, "%s: suspend: PM flags = 0x%x\n",
                 sdio_func_id(func), flags);