misc/pvpanic: Convert regular spinlock into trylock on panic path

[ Upstream commit e918c10265ef2bc82ce8a6fed6d8123d09ec1db3 ]

The pvpanic driver relies on panic notifiers to execute a callback
on panic event. Such function is executed in atomic context - the
panic function disables local IRQs, preemption and all other CPUs
that aren't running the panic code.

With that said, it's dangerous to use regular spinlocks in such path,
as introduced by commit b3c0f8774668 ("misc/pvpanic: probe multiple instances").
This patch fixes that by replacing regular spinlocks with the trylock
safer approach.

It also fixes an old comment (about a long gone framebuffer code) and
the notifier priority - we should execute hypervisor notifiers early,
deferring this way the panic action to the hypervisor, as expected by
the users that are setting up pvpanic.

Fixes: b3c0f8774668 ("misc/pvpanic: probe multiple instances")
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Mihai Carabas <mihai.carabas@oracle.com>
Cc: Shile Zhang <shile.zhang@linux.alibaba.com>
Cc: Wang ShaoBo <bobo.shaobowang@huawei.com>
Cc: zhenwei pi <pizhenwei@bytedance.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Link: https://lore.kernel.org/r/20220427224924.592546-6-gpiccoli@igalia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
index 700d7d0..b9e6400 100644 (file)
--- a/drivers/misc/pvpanic/pvpanic.c
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -34,7 +34,9 @@ pvpanic_send_event(unsigned int event)
 {
        struct pvpanic_instance *pi_cur;
 
-       spin_lock(&pvpanic_lock);
+       if (!spin_trylock(&pvpanic_lock))
+               return;
+
        list_for_each_entry(pi_cur, &pvpanic_list, list) {
                if (event & pi_cur->capability & pi_cur->events)
                        iowrite8(event, pi_cur->base);
@@ -56,9 +58,13 @@ pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
        return NOTIFY_DONE;
 }
 
+/*
+ * Call our notifier very early on panic, deferring the
+ * action taken to the hypervisor.
+ */
 static struct notifier_block pvpanic_panic_nb = {
        .notifier_call = pvpanic_panic_notify,
-       .priority = 1, /* let this called before broken drm_fb_helper() */
+       .priority = INT_MAX,
 };
 
 static void pvpanic_remove(void *param)