From: Mark A. Greer Date: Tue, 23 Sep 2014 23:38:12 +0000 (-0700) Subject: NFC: digital: Add NFC-DEP Target-side NACK Support X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~28^2~16^2~39 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49dbb14e30c3249f98fe243c3e21b91d10c5c59b;p=pandora-kernel.git NFC: digital: Add NFC-DEP Target-side NACK Support When an NFC-DEP Target receives a NACK PDU with a PNI equal to 1 less than the current PNI, it is supposed to re-send the last PDU. This is implied in section 14.12.5.4 of the NFC Digital Protocol Spec. The digital layer's NFC-DEP code doesn't implement Target-side NACK handing so add it. The last PDU that was sent is saved in the 'nfc_digital_dev' structure's 'saved_skb' member. The skb will have an additional reference taken to ensure that the skb isn't freed when the driver performs a kfree_skb() on the skb. The length of the skb/PDU is also saved so the length can be restored when re-sending the PDU in the skb (the driver will perform an skb_pull() so an skb_push() needs to be done to restore the skb's data pointer/length). Reviewed-by: Thierry Escande Tested-by: Thierry Escande Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- Reading git-diff-tree failed