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Subject[PATCH v2] driver core: Fix sleeping in invalid context during device link deletion
From
Marek and Guenter reported that commit 287905e68dd2 ("driver core:
Expose device link details in sysfs") caused sleeping/scheduling while
atomic warnings.

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 12, name: kworker/0:1
2 locks held by kworker/0:1/12:
#0: ee8074a8 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x174/0x7dc
#1: ee921f20 ((work_completion)(&sdp->work)){+.+.}-{0:0}, at: process_one_work+0x174/0x7dc
Preemption disabled at:
[<c01b10f0>] srcu_invoke_callbacks+0xc0/0x154
----- 8< ----- SNIP
[<c064590c>] (device_del) from [<c0645c9c>] (device_unregister+0x24/0x64)
[<c0645c9c>] (device_unregister) from [<c01b10fc>] (srcu_invoke_callbacks+0xcc/0x154)
[<c01b10fc>] (srcu_invoke_callbacks) from [<c01493c4>] (process_one_work+0x234/0x7dc)
[<c01493c4>] (process_one_work) from [<c01499b0>] (worker_thread+0x44/0x51c)
[<c01499b0>] (worker_thread) from [<c0150bf4>] (kthread+0x158/0x1a0)
[<c0150bf4>] (kthread) from [<c0100114>] (ret_from_fork+0x14/0x20)
Exception stack(0xee921fb0 to 0xee921ff8)

This was caused by the device link device being released in the context
of srcu_invoke_callbacks(). There is no need to wait till the RCU
callback to release the device link device. So release the device
earlier and move the call_srcu() into the device release code. That way,
the memory will get freed only after the device is released AND the RCU
callback is called.

Fixes: 287905e68dd2 ("driver core: Expose device link details in sysfs")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Saravana Kannan <saravanak@google.com>
---

v1->v2:
- Better fix
- Changed subject
- v1 is this patch https://lore.kernel.org/lkml/20200716050846.2047110-1-saravanak@google.com/

Marek and Guenter,

I reproduced the original issue and tested this fix. Seems to work for
me. Can you confirm?

Thanks,
Saravana

drivers/base/core.c | 45 +++++++++++++++++++++++++++------------------
1 file changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 5373ddd029f6..ec16b97d45ed 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -306,10 +306,34 @@ static struct attribute *devlink_attrs[] = {
};
ATTRIBUTE_GROUPS(devlink);

+static void device_link_free(struct device_link *link)
+{
+ while (refcount_dec_not_one(&link->rpm_active))
+ pm_runtime_put(link->supplier);
+
+ put_device(link->consumer);
+ put_device(link->supplier);
+ kfree(link);
+}
+
+#ifdef CONFIG_SRCU
+static void __device_link_free_srcu(struct rcu_head *rhead)
+{
+ device_link_free(container_of(rhead, struct device_link, rcu_head));
+}
+
static void devlink_dev_release(struct device *dev)
{
- kfree(to_devlink(dev));
+ struct device_link *link = to_devlink(dev);
+
+ call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu);
}
+#else
+static void devlink_dev_release(struct device *dev)
+{
+ device_link_free(to_devlink(dev));
+}
+#endif

static struct class devlink_class = {
.name = "devlink",
@@ -730,22 +754,7 @@ static void device_link_add_missing_supplier_links(void)
mutex_unlock(&wfs_lock);
}

-static void device_link_free(struct device_link *link)
-{
- while (refcount_dec_not_one(&link->rpm_active))
- pm_runtime_put(link->supplier);
-
- put_device(link->consumer);
- put_device(link->supplier);
- device_unregister(&link->link_dev);
-}
-
#ifdef CONFIG_SRCU
-static void __device_link_free_srcu(struct rcu_head *rhead)
-{
- device_link_free(container_of(rhead, struct device_link, rcu_head));
-}
-
static void __device_link_del(struct kref *kref)
{
struct device_link *link = container_of(kref, struct device_link, kref);
@@ -758,7 +767,7 @@ static void __device_link_del(struct kref *kref)

list_del_rcu(&link->s_node);
list_del_rcu(&link->c_node);
- call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu);
+ device_unregister(&link->link_dev);
}
#else /* !CONFIG_SRCU */
static void __device_link_del(struct kref *kref)
@@ -773,7 +782,7 @@ static void __device_link_del(struct kref *kref)

list_del(&link->s_node);
list_del(&link->c_node);
- device_link_free(link);
+ device_unregister(&link->link_dev);
}
#endif /* !CONFIG_SRCU */

--
2.28.0.rc0.105.gf9edc3c819-goog
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