In cb_free(), we remove some sysfs files -- other sysfs files might
grab ops_mutex, so we cannot hold it while removing sysfs files. This
fixes http://lkml.org/lkml/2010/1/17/88 .
Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net>
---
drivers/pcmcia/cs.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index ca6975a..8f1a6f6 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -400,10 +400,19 @@ static void socket_shutdown(struct pcmcia_socket *s)
s->lock_count = 0;
kfree(s->fake_cis);
s->fake_cis = NULL;
+ s->functions = 0;
+
+ /* From here on we can be sure that only we (that is, the
+ * pccardd thread) accesses this socket, and all (16-bit)
+ * PCMCIA interactions are gone. Therefore, release
+ * ops_mutex so that we don't get a sysfs-related lockdep
+ * warning.
+ */
+ mutex_unlock(&s->ops_mutex);
+
#ifdef CONFIG_CARDBUS
cb_free(s);
#endif
- s->functions = 0;
/* give socket some time to power down */
msleep(100);
@@ -415,7 +424,6 @@ static void socket_shutdown(struct pcmcia_socket *s)
}
s->state &= ~SOCKET_INUSE;
- mutex_unlock(&s->ops_mutex);
}
static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
--
1.6.3.3
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