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net: sfp: report error on failure to read sfp soft status

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Report a rate-limited error if we fail to read the SFP soft status,
and preserve the current status in that case. This avoids I2C bus
errors from triggering a link flap.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2019-12-17 13:50:29 +00:00 committed by David S. Miller
parent d8e419da04
commit 0dea4d039a
1 changed files with 9 additions and 2 deletions
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11
drivers/net/phy/sfp.c
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@ -442,13 +442,20 @@ static unsigned int sfp_soft_get_state(struct sfp *sfp)
{
unsigned int state = 0;
u8 status;
int ret;
if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
sizeof(status)) {
ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
if (ret == sizeof(status)) {
if (status & SFP_STATUS_RX_LOS)
state |= SFP_F_LOS;
if (status & SFP_STATUS_TX_FAULT)
state |= SFP_F_TX_FAULT;
} else {
dev_err_ratelimited(sfp->dev,
"failed to read SFP soft status: %d\n",
ret);
/* Preserve the current state */
state = sfp->state;
}
return state & sfp->state_soft_mask;