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misc: open-dice: Fix spurious lockdep warning 

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>
This commit is contained in:
Will Deacon 2024-01-26 15:24:10 +00:00 committed by Greg Kroah-Hartman
parent a4e61de63e
commit ac9762a74c
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/open-dice.c
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@ -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++);