firmware: arm_sdei: fix possible double-lock on hibernate error path

We call sdei_reregister_event() with sdei_list_lock held, if the register
fails we call sdei_event_destroy() which also acquires sdei_list_lock
thus creating A-A deadlock.

Add '_llocked' to sdei_reregister_event(), to indicate the list lock
is held, and add a _llocked variant of sdei_event_destroy().

Fixes: da351827240e ("firmware: arm_sdei: Add support for CPU and system power states")
Signed-off-by: Liguang Zhang <zhangliguang@linux.alibaba.com>
[expanded subject, added wrappers instead of duplicating contents]
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c
index 77eaa9a2fd15627cc0e09b52fda7922bba0f0ad8..f15f459e9df05c4a95a8c3491ab2b14978642b1d 100644 (file)
--- a/drivers/firmware/arm_sdei.c
+++ b/drivers/firmware/arm_sdei.c
@@ -280,13 +280,12 @@ static struct sdei_event *sdei_event_create(u32 event_num,
        return event;
 }
 
-static void sdei_event_destroy(struct sdei_event *event)
+static void sdei_event_destroy_llocked(struct sdei_event *event)
 {
        lockdep_assert_held(&sdei_events_lock);
+       lockdep_assert_held(&sdei_list_lock);
 
-       spin_lock(&sdei_list_lock);
        list_del(&event->list);
-       spin_unlock(&sdei_list_lock);
 
        if (event->type == SDEI_EVENT_TYPE_SHARED)
                kfree(event->registered);
@@ -296,6 +295,13 @@ static void sdei_event_destroy(struct sdei_event *event)
        kfree(event);
 }
 
+static void sdei_event_destroy(struct sdei_event *event)
+{
+       spin_lock(&sdei_list_lock);
+       sdei_event_destroy_llocked(event);
+       spin_unlock(&sdei_list_lock);
+}
+
 static int sdei_api_get_version(u64 *version)
 {
        return invoke_sdei_fn(SDEI_1_0_FN_SDEI_VERSION, 0, 0, 0, 0, 0, version);
@@ -643,16 +649,17 @@ int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg)
 }
 EXPORT_SYMBOL(sdei_event_register);
 
-static int sdei_reregister_event(struct sdei_event *event)
+static int sdei_reregister_event_llocked(struct sdei_event *event)
 {
        int err;
 
        lockdep_assert_held(&sdei_events_lock);
+       lockdep_assert_held(&sdei_list_lock);
 
        err = _sdei_event_register(event);
        if (err) {
                pr_err("Failed to re-register event %u\n", event->event_num);
-               sdei_event_destroy(event);
+               sdei_event_destroy_llocked(event);
                return err;
        }
 
@@ -681,7 +688,7 @@ static int sdei_reregister_shared(void)
                        continue;
 
                if (event->reregister) {
-                       err = sdei_reregister_event(event);
+                       err = sdei_reregister_event_llocked(event);
                        if (err)
                                break;
                }