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authorDavid S. Miller <davem@davemloft.net>2010-01-04 15:31:10 -0800
committerDavid S. Miller <davem@davemloft.net>2010-01-04 15:31:10 -0800
commitc7c17c2779075e675cb3c7fe2ecde67e226771fb (patch)
tree680ab98f6f9b2275b7140f73a3c3a842062a7e93 /drivers/sbus
parent7466bd3caab6bd1d0095de957affbacd02ca58a7 (diff)
downloadvexpress-lsk-c7c17c2779075e675cb3c7fe2ecde67e226771fb.tar.gz
bbc_envctrl: Clean up properly if kthread_run() fails.
In bbc_envctrl_init() we have to unlink the fan and temp instances from the lists because our caller is going to free up the 'bp' object if we return an error. We can't rely upon bbc_envctrl_cleanup() to do this work for us in this case. Reported-by: Patrick Finnegan <pat@computer-refuge.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/sbus')
-rw-r--r--drivers/sbus/char/bbc_envctrl.c64
1 files changed, 38 insertions, 26 deletions
diff --git a/drivers/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c
index 7c815d3327f..28d86f9df83 100644
--- a/drivers/sbus/char/bbc_envctrl.c
+++ b/drivers/sbus/char/bbc_envctrl.c
@@ -522,6 +522,40 @@ static void attach_one_fan(struct bbc_i2c_bus *bp, struct of_device *op,
set_fan_speeds(fp);
}
+static void destroy_one_temp(struct bbc_cpu_temperature *tp)
+{
+ bbc_i2c_detach(tp->client);
+ kfree(tp);
+}
+
+static void destroy_all_temps(struct bbc_i2c_bus *bp)
+{
+ struct bbc_cpu_temperature *tp, *tpos;
+
+ list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
+ list_del(&tp->bp_list);
+ list_del(&tp->glob_list);
+ destroy_one_temp(tp);
+ }
+}
+
+static void destroy_one_fan(struct bbc_fan_control *fp)
+{
+ bbc_i2c_detach(fp->client);
+ kfree(fp);
+}
+
+static void destroy_all_fans(struct bbc_i2c_bus *bp)
+{
+ struct bbc_fan_control *fp, *fpos;
+
+ list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
+ list_del(&fp->bp_list);
+ list_del(&fp->glob_list);
+ destroy_one_fan(fp);
+ }
+}
+
int bbc_envctrl_init(struct bbc_i2c_bus *bp)
{
struct of_device *op;
@@ -541,6 +575,8 @@ int bbc_envctrl_init(struct bbc_i2c_bus *bp)
int err = PTR_ERR(kenvctrld_task);
kenvctrld_task = NULL;
+ destroy_all_temps(bp);
+ destroy_all_fans(bp);
return err;
}
}
@@ -548,35 +584,11 @@ int bbc_envctrl_init(struct bbc_i2c_bus *bp)
return 0;
}
-static void destroy_one_temp(struct bbc_cpu_temperature *tp)
-{
- bbc_i2c_detach(tp->client);
- kfree(tp);
-}
-
-static void destroy_one_fan(struct bbc_fan_control *fp)
-{
- bbc_i2c_detach(fp->client);
- kfree(fp);
-}
-
void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp)
{
- struct bbc_cpu_temperature *tp, *tpos;
- struct bbc_fan_control *fp, *fpos;
-
if (kenvctrld_task)
kthread_stop(kenvctrld_task);
- list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
- list_del(&tp->bp_list);
- list_del(&tp->glob_list);
- destroy_one_temp(tp);
- }
-
- list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
- list_del(&fp->bp_list);
- list_del(&fp->glob_list);
- destroy_one_fan(fp);
- }
+ destroy_all_temps(bp);
+ destroy_all_fans(bp);
}