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ring-buffer: Unlock resize on mmap error

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Memory mapping the tracing ring buffer will disable resizing the buffer.
But if there's an error in the memory mapping like an invalid parameter,
the function exits out without re-enabling the resizing of the ring
buffer, preventing the ring buffer from being resized after that.

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/20250213131957.530ec3c5@gandalf.local.home
Fixes: 117c39200d ("ring-buffer: Introducing ring-buffer mapping functions")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-02-13 13:19:57 -05:00 • committed by Steven Rostedt (Google)
parent a64dcfb451
commit 9ba0e1755a
1 changed files with 1 additions and 0 deletions
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kernel/trace/ring_buffer.c
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@ -7126,6 +7126,7 @@ int ring_buffer_map(struct trace_buffer *buffer, int cpu,
kfree(cpu_buffer->subbuf_ids);
cpu_buffer->subbuf_ids = NULL;
rb_free_meta_page(cpu_buffer);
atomic_dec(&cpu_buffer->resize_disabled);
}
unlock: