From d4a41d10b2cb5890aeda6b2912973b2a754b05b1 Mon Sep 17 00:00:00 2001 From: Christophe Ricard Date: Tue, 31 Mar 2015 08:02:15 +0200 Subject: [PATCH] NFC: st21nfcb: Retry i2c_master_send if it returns a negative value i2c_master_send may return many negative values different than -EREMOTEIO. In case an i2c transaction is NACK'ed, on raspberry pi B+ kernel 3.18, -EIO is generated instead. Cc: stable@vger.kernel.org Signed-off-by: Christophe Ricard Signed-off-by: Samuel Ortiz --- drivers/nfc/st21nfcb/i2c.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/nfc/st21nfcb/i2c.c b/drivers/nfc/st21nfcb/i2c.c index eb886932d972..7b53a5c84041 100644 --- a/drivers/nfc/st21nfcb/i2c.c +++ b/drivers/nfc/st21nfcb/i2c.c @@ -109,7 +109,7 @@ static int st21nfcb_nci_i2c_write(void *phy_id, struct sk_buff *skb) return phy->ndlc->hard_fault; r = i2c_master_send(client, skb->data, skb->len); - if (r == -EREMOTEIO) { /* Retry, chip was in standby */ + if (r < 0) { /* Retry, chip was in standby */ usleep_range(1000, 4000); r = i2c_master_send(client, skb->data, skb->len); } @@ -148,7 +148,7 @@ static int st21nfcb_nci_i2c_read(struct st21nfcb_i2c_phy *phy, struct i2c_client *client = phy->i2c_dev; r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE); - if (r == -EREMOTEIO) { /* Retry, chip was in standby */ + if (r < 0) { /* Retry, chip was in standby */ usleep_range(1000, 4000); r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE); } -- 2.20.1