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authorMing Lei <ming.lei@canonical.com>2013-03-15 12:08:57 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-25 10:55:46 -0700
commit81b50be036f91c8502e960c33dca04ac19f96baf (patch)
tree5033aecd7e806aaff5964ccd326a4588eebd2aab /drivers/net/usb/qmi_wwan.c
parent9a44312a79786c2fefac8e298a99826e9dc21f17 (diff)
downloadlinaro-lsk-81b50be036f91c8502e960c33dca04ac19f96baf.tar.gz
usbnet: qmi_wwan: comments on suspend failure
If suspend callback fails in system sleep context, usb core will ignore the failure and let system sleep go ahead further, so this patch comments on the case and requires that both usbnet_suspend() and subdriver->suspend() MUST return 0 in system sleep context. Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/usb/qmi_wwan.c')
-rw-r--r--drivers/net/usb/qmi_wwan.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 968d5d50751..bdceb7411de 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -271,6 +271,11 @@ static int qmi_wwan_suspend(struct usb_interface *intf, pm_message_t message)
struct qmi_wwan_state *info = (void *)&dev->data;
int ret;
+ /*
+ * Both usbnet_suspend() and subdriver->suspend() MUST return 0
+ * in system sleep context, otherwise, the resume callback has
+ * to recover device from previous suspend failure.
+ */
ret = usbnet_suspend(intf, message);
if (ret < 0)
goto err;