Kernel: Switch process file descriptor table from spinlock to mutex

There's no reason for this to use a spinlock. Instead, let's allow
threads to block if someone else is using the descriptor table.

1 files changed, 1 insertions, 1 deletions

diff --git a/Kernel/Syscalls/poll.cpp b/Kernel/Syscalls/poll.cpp
index 42cf36e005..a783b72f4d 100644
--- a/Kernel/Syscalls/poll.cpp
+++ b/Kernel/Syscalls/poll.cpp
@@ -49,7 +49,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<const Syscall::SC_poll_params*> use
 
     for (size_t i = 0; i < params.nfds; i++) {
         auto& pfd = fds_copy[i];
-        auto description = TRY(m_fds.with([&](auto& fds) { return fds.open_file_description(pfd.fd); }));
+        auto description = TRY(m_fds.with_shared([&](auto& fds) { return fds.open_file_description(pfd.fd); }));
         BlockFlags block_flags = BlockFlags::Exception; // always want POLLERR, POLLHUP, POLLNVAL
         if (pfd.events & POLLIN)
             block_flags |= BlockFlags::Read;