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| author | Tilman Schmidt <tilman@imap.cc> | 2008-03-07 19:47:08 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-03-07 11:06:08 -0800 |
| commit | 5d49c101a126808a38f2a1f4eedc1fd28233e37f (patch) | |
| tree | b227dbfadf35428ea0db7cb071f5e33e22702682 /drivers/isdn | |
| parent | 1d6789c3bc2b70bed1eb71aa616b1d94f9c23a63 (diff) | |
| download | lwn-5d49c101a126808a38f2a1f4eedc1fd28233e37f.tar.gz lwn-5d49c101a126808a38f2a1f4eedc1fd28233e37f.zip | |
gigaset: fix Oops on module unload regression
The card state mutex was only initialized when a device was connected,
but used during unload unconditionally, leading to an Oops if a driver
was loaded and unloaded again without ever connecting a device.
Fix this by initializing the mutex as soon as the structure is allocated.
Also add a missing mutex unlock revealed in the same execution path.
This fixes a possible Oops in 2.6.25-rc that was introduced by commit
e468c04894f36045cf93d1384183a461014b6840 ("Gigaset: permit module
unload").
Thanks to Roland Kletzing for reporting this problem.
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Tested-by: Roland Kletzing <devzero@web.de>
Cc: Hansjoerg Lipp <hjlipp@web.de>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/isdn')
| -rw-r--r-- | drivers/isdn/gigaset/common.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c index aacedec4986f..827c32c16795 100644 --- a/drivers/isdn/gigaset/common.c +++ b/drivers/isdn/gigaset/common.c @@ -637,7 +637,6 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, err("maximum number of devices exceeded"); return NULL; } - mutex_init(&cs->mutex); gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1); cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL); @@ -898,8 +897,10 @@ int gigaset_shutdown(struct cardstate *cs) { mutex_lock(&cs->mutex); - if (!(cs->flags & VALID_MINOR)) + if (!(cs->flags & VALID_MINOR)) { + mutex_unlock(&cs->mutex); return -1; + } cs->waiting = 1; @@ -1086,6 +1087,7 @@ struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors, drv->cs[i].driver = drv; drv->cs[i].ops = drv->ops; drv->cs[i].minor_index = i; + mutex_init(&drv->cs[i].mutex); } gigaset_if_initdriver(drv, procname, devname); |