[PATCH net-next v2 01/13] net: phy: sfp: make the i2c-bus property really optional
From: Antoine Tenart
Date: Fri May 04 2018 - 10:05:07 EST
The SFF,SFP documentation is clear about making all the DT properties,
with the exception of the compatible, optional. In practice this is not
the case and without an i2c-bus property provided the SFP code will
throw NULL pointer exceptions.
This patch is an attempt to fix this.
Signed-off-by: Antoine Tenart <antoine.tenart@xxxxxxxxxxx>
---
drivers/net/phy/sfp.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 4ab6e9a50bbe..4686c443fc22 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -298,11 +298,17 @@ static void sfp_set_state(struct sfp *sfp, unsigned int state)
static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
{
+ if (!sfp->read)
+ return -EOPNOTSUPP;
+
return sfp->read(sfp, a2, addr, buf, len);
}
static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
{
+ if (!sfp->write)
+ return -EOPNOTSUPP;
+
return sfp->write(sfp, a2, addr, buf, len);
}
@@ -533,6 +539,8 @@ static int sfp_sm_mod_hpower(struct sfp *sfp)
return 0;
err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
+ if (err == -EOPNOTSUPP)
+ goto err;
if (err != sizeof(val)) {
dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
err = -EAGAIN;
@@ -542,6 +550,8 @@ static int sfp_sm_mod_hpower(struct sfp *sfp)
val |= BIT(0);
err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
+ if (err == -EOPNOTSUPP)
+ goto err;
if (err != sizeof(val)) {
dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
err = -EAGAIN;
@@ -565,6 +575,8 @@ static int sfp_sm_mod_probe(struct sfp *sfp)
int ret;
ret = sfp_read(sfp, false, 0, &id, sizeof(id));
+ if (ret == -EOPNOTSUPP)
+ return ret;
if (ret < 0) {
dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
return -EAGAIN;
--
2.17.0