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authorWaldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>2012-12-10 13:42:56 (GMT)
committerSamuel Ortiz <sameo@linux.intel.com>2013-01-09 23:51:43 (GMT)
commit5b5a4437ae078cbe35020e74eb0b66ebedc2a2c0 (patch)
treee32ba699b50d7e34f284f7c38fa3ebede221ba86 /drivers/nfc
parentfcfafc7690164d08dfd8133a860f25db8019ca2e (diff)
downloadlinux-5b5a4437ae078cbe35020e74eb0b66ebedc2a2c0.tar.xz
NFC: pn533: Don't use out_frame in pn533_send_ack
dev->out_frame buffer is much bigger for ACK frame needs. Use local buffer instead. Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc')
-rw-r--r--drivers/nfc/pn533.c31
1 files changed, 6 insertions, 25 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 5fb5b8f..5bc0c7c 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -94,7 +94,8 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
PN533_FRAME_TAIL_LEN)
-#define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1)
+#define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
+ Postamble (1) */
#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
#define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
@@ -402,26 +403,6 @@ static u8 pn533_data_checksum(u8 *data, int datalen)
return pn533_checksum(sum);
}
-/**
- * pn533_tx_frame_ack - create a ack frame
- * @frame: The frame to be set as ack
- *
- * Ack is different type of standard frame. As a standard frame, it has
- * preamble and start_frame. However the checksum of this frame must fail,
- * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test
- * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack.
- * After datalen_checksum field, the postamble is placed.
- */
-static void pn533_tx_frame_ack(struct pn533_frame *frame)
-{
- frame->preamble = 0;
- frame->start_frame = cpu_to_be16(PN533_SOF);
- frame->datalen = 0;
- frame->datalen_checksum = 0xFF;
- /* data[0] is used as postamble */
- frame->data[0] = 0;
-}
-
static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
{
frame->preamble = 0;
@@ -612,14 +593,14 @@ static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
{
+ u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
+ /* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
- pn533_tx_frame_ack(dev->out_frame);
-
- dev->out_urb->transfer_buffer = dev->out_frame;
- dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
+ dev->out_urb->transfer_buffer = ack;
+ dev->out_urb->transfer_buffer_length = sizeof(ack);
rc = usb_submit_urb(dev->out_urb, flags);
return rc;