From 59df9bb25cf8a13443b8335a7a9013817c050b88 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Wed, 4 Nov 2015 08:13:00 -0200 Subject: [PATCH] nxp-nci: i2c: Do not check specifically for -EREMOTEIO error Function nxp_nci_i2c_write currently assumes in case of I2C bus NACK that the NFC device is in stand-by mode and will retry the I2C transaction after a pause. This assumes that the first failed I2C transaction will wake-up the device. This is done by checking on EREMOTEIO, which is wrong. According to Documentation/i2c/fault-codes ENXIO shall be used. Unfortunately the NOACK return code is currently inconsistent across various I2C host controller drivers. So only check for the generic error case instead. This is a temporary fix. As soon as all I2C bus master drivers are fixed to consistently return 'ENXIO', then we can do the specific error check again. Signed-off-by: Fabio Estevam Signed-off-by: Samuel Ortiz --- drivers/nfc/nxp-nci/i2c.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c index df4333c7ee0f..ec359fc10b48 100644 --- a/drivers/nfc/nxp-nci/i2c.c +++ b/drivers/nfc/nxp-nci/i2c.c @@ -85,7 +85,7 @@ static int nxp_nci_i2c_write(void *phy_id, struct sk_buff *skb) return phy->hard_fault; r = i2c_master_send(client, skb->data, skb->len); - if (r == -EREMOTEIO) { + if (r < 0) { /* Retry, chip was in standby */ usleep_range(110000, 120000); r = i2c_master_send(client, skb->data, skb->len); -- 2.20.1