On Fri, 13 Nov 2020 16:30:31 -0500 Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote: > We will be using the mutex_trylock() function in our sysfs > assignment > interfaces which make the call to the AP bus to check permissions (which > also > locks ap_perms). If the mutex_trylock() fails, we return from the assignment > function with -EBUSY. This should resolve that potential deadlock issue. It resolves the deadlock issue only if in_use() is also doing mutex_trylock(), but the if in_use doesn't take the lock it needs to back off (and so does it's client code) i.e. a boolean as return value won't do. Regards, Halil
