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usb: gadget: functionfs: Fix inverted DMA fence direction

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A "read" fence was installed when the DMABUF was to be written to,
and a "write" fence was installed when the DMABUF was to be read from.

Besides, dma_resv_usage_rw() should only be used when waiting for
fences.

Fixes: 7b07a2a7ca02 ("usb: gadget: functionfs: Add DMABUF import interface")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20240402110951.16376-2-paul@crapouillou.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Cercueil 2024-04-02 13:09:50 +02:00 committed by Greg Kroah-Hartman
parent ce4c8d2105
commit 1500a7b279
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/gadget/function/f_fs.c
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@ -1578,6 +1578,7 @@ static int ffs_dmabuf_transfer(struct file *file,
struct ffs_dmabuf_priv *priv;
struct ffs_dma_fence *fence;
struct usb_request *usb_req;
enum dma_resv_usage resv_dir;
struct dma_buf *dmabuf;
struct ffs_ep *ep;
bool cookie;
@ -1665,8 +1666,9 @@ static int ffs_dmabuf_transfer(struct file *file,
dma_fence_init(&fence->base, &ffs_dmabuf_fence_ops,
&priv->lock, priv->context, seqno);
dma_resv_add_fence(dmabuf->resv, &fence->base,
dma_resv_usage_rw(epfile->in));
resv_dir = epfile->in ? DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ;
dma_resv_add_fence(dmabuf->resv, &fence->base, resv_dir);
dma_resv_unlock(dmabuf->resv);
/* Now that the dma_fence is in place, queue the transfer. */