p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

NFC: st21nfcb: Fix logic when running into i2c read retry 

When retrying to read the NCI header, the CLF might not be
available the first time. However it may not be successful
the second time and this may cause an error in the function.
Enforce the retrieve data length is as expected.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Christophe Ricard 2014-09-03 23:30:26 +02:00 committed by Samuel Ortiz
parent 56f1ffcccd
commit ac633ba6ac
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/nfc/st21nfcb/i2c.c
View File

@ -168,7 +168,9 @@ static int st21nfcb_nci_i2c_read(struct st21nfcb_i2c_phy *phy,
if (r == -EREMOTEIO) { /* Retry, chip was in standby */
usleep_range(1000, 4000);
r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE);
} else if (r != ST21NFCB_NCI_I2C_MIN_SIZE) {
}
if (r != ST21NFCB_NCI_I2C_MIN_SIZE) {
nfc_err(&client->dev, "cannot read ndlc & nci header\n");
return -EREMOTEIO;
}