From bbedefccc6b0da43cfaf785dac89c88bc59cb6ed Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 3 Oct 2006 12:24:23 -0500 Subject: [PATCH] [PATCH] ibmveth: Harden driver initilisation This patch has been floating around for a while now, Santi originally sent it in March: http://www.spinics.net/lists/netdev/msg00471.html After a kexec the ibmveth driver will fail when trying to register with the Hypervisor because the previous kernel has not unregistered. So if the registration fails, we unregister and then try again. We don't unconditionally unregister, because we don't want to disturb the regular code path for 99% of users. Signed-off-by: Michael Ellerman Acked-by: Anton Blanchard Signed-off-by: Santiago Leon Signed-off-by: Jeff Garzik --- drivers/net/ibmveth.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index 767203d35bc2..df3a59efa7a8 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -437,6 +437,31 @@ static void ibmveth_cleanup(struct ibmveth_adapter *adapter) &adapter->rx_buff_pool[i]); } +static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter, + union ibmveth_buf_desc rxq_desc, u64 mac_address) +{ + int rc, try_again = 1; + + /* After a kexec the adapter will still be open, so our attempt to + * open it will fail. So if we get a failure we free the adapter and + * try again, but only once. */ +retry: + rc = h_register_logical_lan(adapter->vdev->unit_address, + adapter->buffer_list_dma, rxq_desc.desc, + adapter->filter_list_dma, mac_address); + + if (rc != H_SUCCESS && try_again) { + do { + rc = h_free_logical_lan(adapter->vdev->unit_address); + } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY)); + + try_again = 0; + goto retry; + } + + return rc; +} + static int ibmveth_open(struct net_device *netdev) { struct ibmveth_adapter *adapter = netdev->priv; @@ -502,12 +527,7 @@ static int ibmveth_open(struct net_device *netdev) ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr); ibmveth_debug_printk("receive q @ 0x%p\n", adapter->rx_queue.queue_addr); - - lpar_rc = h_register_logical_lan(adapter->vdev->unit_address, - adapter->buffer_list_dma, - rxq_desc.desc, - adapter->filter_list_dma, - mac_address); + lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address); if(lpar_rc != H_SUCCESS) { ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc); -- 2.39.2