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USB: for usb_autopm_get_interface_async -EINPROGRESS is not an error

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commit c5a48592d8 upstream.

A return value of -EINPROGRESS from pm_runtime_get indicates that
the device is already resuming due to a previous call.  Internally,
usb_autopm_get_interface_async doesn't treat this as an error and
increments the usage count, but passes the error status along
to the caller.  The logical assumption of the caller is that
any negative return value reflects the device not resuming
and the pm_usage_cnt not being incremented.  Since the usage count
is being incremented and the device is resuming, return success (0)
instead.

Signed-off-by: James Wylder <james.wylder@motorola.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jim Wylder
2011-09-06 21:07:20 -05:00
committed by Greg Kroah-Hartman
parent 368f255e47
commit d8d92c4fdb
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/core/driver.c
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@@ -1583,7 +1583,7 @@ int usb_autopm_get_interface_async(struct usb_interface *intf)
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
__func__, atomic_read(&intf->dev.power.usage_count),
status);
if (status > 0)
if (status > 0 || status == -EINPROGRESS)
status = 0;
return status;
}