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The bt8xx driver only uses the big kernel lock in its dst_ca_ioctl function and never to serialize against other code, so we can trivially replace it with a private mutex. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: linux-media@vger.kernel.org Cc: Mauro Carvalho Chehab <mchehab@infradead.org>