From 4542e8345af6076c87d036c7bd3f9dfa30768b1e Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 2 Sep 2014 15:12:19 -0700 Subject: [PATCH] NFC: trf7970a: Ignore Overflow bit in FIFO Status Register The Overflow bit in the 'FIFO Status Register' has proven to be untrustworthy so ignore it. Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- drivers/nfc/trf7970a.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index badd2c7ffa92..ac3db9d9eeca 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -561,12 +561,7 @@ static void trf7970a_fill_fifo(struct trf7970a *trf) dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); - if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) { - dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__, - fifo_bytes); - trf7970a_send_err_upstream(trf, -EIO); - return; - } + fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; /* Calculate how much more data can be written to the fifo */ len = TRF7970A_FIFO_SIZE - fifo_bytes; @@ -596,16 +591,11 @@ static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); + fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; + if (!fifo_bytes) goto no_rx_data; - if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) { - dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__, - fifo_bytes); - trf7970a_send_err_upstream(trf, -EIO); - return; - } - if (fifo_bytes > skb_tailroom(skb)) { skb = skb_copy_expand(skb, skb_headroom(skb), max_t(int, fifo_bytes, -- 2.20.1