From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Ellerman Subject: [PATCH 8/18] iseries_veth: Make init_connection() & destroy_connection() symmetrical Date: Thu, 1 Sep 2005 11:29:08 +1000 (EST) Message-ID: <20050901012908.E24DF68212@ozlabs.org> References: <1125538127.859382.875909607846.qpush@concordia> Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc64-dev@ozlabs.org Return-path: To: In-Reply-To: <1125538127.859382.875909607846.qpush@concordia> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc64-dev-bounces@ozlabs.org Errors-To: linuxppc64-dev-bounces@ozlabs.org List-Id: netdev.vger.kernel.org This patch makes veth_init_connection() and veth_destroy_connection() symmetrical in that they allocate/deallocate the same data. Currently if there's an error while initialising connections (ie. ENOMEM) we call veth_module_cleanup(), however this will oops because we call driver_unregister() before we've called driver_register(). I've never seen this actually happen though. So instead we explicitly call veth_destroy_connection() for each connection, any that have been set up will be deallocated. We also fix a potential leak if vio_register_driver() fails. Signed-off-by: Michael Ellerman --- drivers/net/iseries_veth.c | 35 ++++++++++++++++++++++------------- 1 files changed, 22 insertions(+), 13 deletions(-) Index: veth-dev2/drivers/net/iseries_veth.c =================================================================== --- veth-dev2.orig/drivers/net/iseries_veth.c +++ veth-dev2/drivers/net/iseries_veth.c @@ -683,6 +683,14 @@ static void veth_stop_connection(u8 rlp) /* Wait for the state machine to run. */ flush_scheduled_work(); +} + +static void veth_destroy_connection(u8 rlp) +{ + struct veth_lpar_connection *cnx = veth_cnx[rlp]; + + if (! cnx) + return; if (cnx->num_events > 0) mf_deallocate_lp_events(cnx->remote_lp, @@ -694,14 +702,6 @@ static void veth_stop_connection(u8 rlp) HvLpEvent_Type_VirtualLan, cnx->num_ack_events, NULL, NULL); -} - -static void veth_destroy_connection(u8 rlp) -{ - struct veth_lpar_connection *cnx = veth_cnx[rlp]; - - if (! cnx) - return; kfree(cnx->msgs); kfree(cnx); @@ -1441,15 +1441,24 @@ int __init veth_module_init(void) for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { rc = veth_init_connection(i); - if (rc != 0) { - veth_module_cleanup(); - return rc; - } + if (rc != 0) + goto error; } HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan, &veth_handle_event); - return vio_register_driver(&veth_driver); + rc = vio_register_driver(&veth_driver); + if (rc != 0) + goto error; + + return 0; + +error: + for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { + veth_destroy_connection(i); + } + + return rc; } module_init(veth_module_init);