[PATCH] libertas sdio: fix suspend when interface is down

Daniel Drake dsd at laptop.org
Mon Sep 3 15:49:09 EDT 2012

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 at laptop.org>
 drivers/net/wireless/libertas/if_sdio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index e970897..4cb2343 100644
--- 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);

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