lkml.org 
[lkml]   [2005]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 8/18] iseries_veth: Make init_connection() & destroy_connection() symmetrical
Date
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 <michael@ellerman.id.au>
---

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);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2005-09-01 03:36    [W:0.097 / U:0.020 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site