sfc: Clear I2C adapter structure in falcon_remove_nic()

i2c_del_adapter() leaves dangling pointers in the structure.  If we
retry the NIC probe and pass the structure to i2c_add_adapter() again
it will lead to an oops unless we clear it first.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index 9e2f0f0d47a871a1dbf2833f127c74b5fe7b2d4a..efd121c42a21c43ab0f8c90c04bb41fc442525e9 100644 (file)
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -3114,8 +3114,10 @@ void falcon_remove_nic(struct efx_nic *efx)
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;
 
+       /* Remove I2C adapter and clear it in preparation for a retry */
        rc = i2c_del_adapter(&efx->i2c_adap);
        BUG_ON(rc);
+       memset(&efx->i2c_adap, 0, sizeof(efx->i2c_adap));
 
        falcon_remove_spi_devices(efx);
        falcon_free_buffer(efx, &efx->irq_status);