On Friday 06 November 2009, Jean Delvare wrote:I'm not sure why we need to hold the mutex here? My understanding is
that watchdog_data_mutex protects watchdog_data_list and each
watchdog's kref. And the above code doesn't touch either.
What I am more worried about is why ident is declared static. This
looks like a bug to me. Instead of abusing watchdog_data_mutex to
workaround this, I'd rather remove the "static". I guess that the
current code happens to work because neither data->revision nor
nowayout can change over time, but this looks needlessly fragile.
Hans, any comment?
The data copied into the watchdog_info data structure is completely
static. To make that clearer, I'd suggest moving it outside of
the ioctl function, and initializing it from fschmd_init.
Then it becomes obvious that the mutex is not needed to protect it.