NFC: nxp-nci: Don't issue a zero length i2c_master_read()
authorMichael Walle <michael@walle.cc>
Mon, 27 Jun 2022 17:06:42 +0000 (19:06 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 7 Jul 2022 15:53:28 +0000 (17:53 +0200)
commiteaf7e6fe4b07f979845484f112493a4203ed55e4
treedd1abe9a0373851b124fa89aee5376b37ef5646e
parentd13a5b86e284d8abadaa01618f7411439556feb7
NFC: nxp-nci: Don't issue a zero length i2c_master_read()

commit eddd95b9423946aaacb55cac6a9b2cea8ab944fc upstream.

There are packets which doesn't have a payload. In that case, the second
i2c_master_read() will have a zero length. But because the NFC
controller doesn't have any data left, it will NACK the I2C read and
-ENXIO will be returned. In case there is no payload, just skip the
second i2c master read.

Fixes: 6be88670fc59 ("NFC: nxp-nci_i2c: Add I2C support to NXP NCI driver")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/nfc/nxp-nci/i2c.c