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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>
This commit is contained in:
Daniel Drake 2012-09-03 15:49:09 -04:00 committed by John W. Linville
parent efd5d6b03b
commit f10723841e
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/libertas/if_sdio.c
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@ -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);