Patchwork [v3,5/7] usbnet: qmi_wwan: comments on suspend failure

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Submitter Ming Lei
Date March 15, 2013, 4:08 a.m.
Message ID <1363320539-23012-6-git-send-email-ming.lei@canonical.com>
Download mbox | patch
Permalink /patch/227849/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Ming Lei - March 15, 2013, 4:08 a.m.
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>
---
 drivers/net/usb/qmi_wwan.c |    5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 968d5d5..bdceb74 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;