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Subject[PATCH 06/18] staging: gasket: fix deadlock in pci driver unregister path
Date
From: Todd Poynor <toddpoynor@google.com>

g_mutex held across pci_unregister_driver() call, also held in
gasket_pci_remove(), which deadlocks.

Reported-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Zhongze Hu <frankhu@chromium.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
---
drivers/staging/gasket/gasket_core.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 3bdf7d36b397..6d240dc59557 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -668,13 +668,10 @@ static void gasket_pci_remove(struct pci_dev *pci_dev)
struct gasket_dev *gasket_dev = NULL;
const struct gasket_driver_desc *driver_desc;
/* Find the device desc. */
- mutex_lock(&g_mutex);
+ __must_hold(&g_mutex);
internal_desc = lookup_internal_desc(pci_dev);
- if (!internal_desc) {
- mutex_unlock(&g_mutex);
+ if (!internal_desc)
return;
- }
- mutex_unlock(&g_mutex);

driver_desc = internal_desc->driver_desc;

--
2.18.0.203.gfac676dfb9-goog
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