6.6-stable review patch. If anyone has any objections, please let me know.
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From: Will Deacon will@kernel.org
[ Upstream commit ac9762a74c7ca7cbfcb4c65f5871373653a046ac ]
When probing the open-dice driver with PROVE_LOCKING=y, lockdep complains that the mutex in 'drvdata->lock' has a non-static key:
| INFO: trying to register non-static key. | The code is fine but needs lockdep annotation, or maybe | you didn't initialize this object before use? | turning off the locking correctness validator.
Fix the problem by initialising the mutex memory with mutex_init() instead of __MUTEX_INITIALIZER().
Cc: Arnd Bergmann arnd@arndb.de Cc: David Brazdil dbrazdil@google.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20240126152410.10148-1-will@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/misc/open-dice.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/open-dice.c b/drivers/misc/open-dice.c index 8aea2d070a40c..d279a4f195e2a 100644 --- a/drivers/misc/open-dice.c +++ b/drivers/misc/open-dice.c @@ -140,7 +140,6 @@ static int __init open_dice_probe(struct platform_device *pdev) return -ENOMEM;
*drvdata = (struct open_dice_drvdata){ - .lock = __MUTEX_INITIALIZER(drvdata->lock), .rmem = rmem, .misc = (struct miscdevice){ .parent = dev, @@ -150,6 +149,7 @@ static int __init open_dice_probe(struct platform_device *pdev) .mode = 0600, }, }; + mutex_init(&drvdata->lock);
/* Index overflow check not needed, misc_register() will fail. */ snprintf(drvdata->name, sizeof(drvdata->name), DRIVER_NAME"%u", dev_idx++);