Le mercredi 19 juin 2024 à 13:43 +0200, Markus Elfring a écrit : > … > > +++ b/drivers/iio/industrialio-buffer.c > … > > +static void iio_buffer_dmabuf_release(struct kref *ref) > > +{ > … > > + dma_resv_lock(dmabuf->resv, NULL); > > + dma_buf_unmap_attachment(attach, priv->sgt, priv->dir); > > + dma_resv_unlock(dmabuf->resv); > … > > Under which circumstances will another lock guard become applicable? > https://elixir.bootlin.com/linux/v6.10-rc4/source/include/linux/cleanup.h#L179 As soon as "struct dma_resv" gets a DEFINE_GUARD(). -Paul