[PATCH V8 7/8] usb: return error when fail to get usb device descriptor in the usb_get_configuration()

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

Change since v6: Add judgement basis "result != -EPIPE" of return error.

Since usb port may power off, usb device descriptor can't be get
at that time and usb_get_configuration() should return error.

Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 drivers/usb/core/config.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index f4bdd0c..7199adc 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -702,6 +702,8 @@ int usb_get_configuration(struct usb_device *dev)
 		if (result < 0) {
 			dev_err(ddev, "unable to read config index %d "
 			    "descriptor/%s: %d\n", cfgno, "start", result);
+			if (result != -EPIPE)
+				goto err;
 			dev_err(ddev, "chopping to %d config(s)\n", cfgno);
 			dev->descriptor.bNumConfigurations = cfgno;
 			break;
-- 
1.7.6.rc2.8.g28eb

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