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The proc read of each client should protect against the concurrent data changes to keep the data consistent; although they are supposed to be safe and won't crash things, it doesn't guarantee the consistency between the read values. Take client->ioctl_mutex for protecting against the concurrent changes. Link: https://patch.msgid.link/20250307084246.29271-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>