linux-kernel - [PATCH 4.1 044/267] NFC: st21nfcb: Do not remove header once the payload is sent

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Message-Id: <20150731194003.307593314@linuxfoundation.org>
Date:	Fri, 31 Jul 2015 12:38:15 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Christophe Ricard <christophe-h.ricard@...com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 4.1 044/267] NFC: st21nfcb: Do not remove header once the payload is sent

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Ricard <christophe.ricard@...il.com>

commit 09f39a950523b1bb830c30a8670b77e0067da092 upstream.

Once the data is sent, we need to preserve the full frame for
the ndlc state machine. If the NDLC ACK is not received in time,
the ndlc layer will resend the same frame.
Having the header byte pulled will corrupt the frame.

Signed-off-by: Christophe Ricard <christophe-h.ricard@...com>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/nfc/st21nfcb/i2c.c |    7 -------
 1 file changed, 7 deletions(-)

--- a/drivers/nfc/st21nfcb/i2c.c
+++ b/drivers/nfc/st21nfcb/i2c.c
@@ -87,11 +87,6 @@ static void st21nfcb_nci_i2c_disable(voi
 	gpio_set_value(phy->gpio_reset, 1);
 }
 
-static void st21nfcb_nci_remove_header(struct sk_buff *skb)
-{
-	skb_pull(skb, ST21NFCB_FRAME_HEADROOM);
-}
-
 /*
  * Writing a frame must not return the number of written bytes.
  * It must return either zero for success, or <0 for error.
@@ -121,8 +116,6 @@ static int st21nfcb_nci_i2c_write(void *
 			r = 0;
 	}
 
-	st21nfcb_nci_remove_header(skb);
-
 	return r;
 }
 


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