On Thu, Nov 19, 2020 at 1:06 AM Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote:
>
> On Wed, Nov 4, 2020 at 7:32 AM Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote:
> >
> > Inside alloc_user_pages() based on flag value either pin_user_pages()
> > or get_user_pages_fast() will be called. However, these API might fail.
> >
> > But free_user_pages() called in error handling path doesn't bother
> > about return value and will try to unpin bo->pgnr pages, which is
> > incorrect.
> >
> > Fix this by passing the page_nr to free_user_pages(). If page_nr > 0
> > pages will be unpinned based on bo->mem_type. This will also take care
> > of non error handling path.
> >
> > Fixes: 14a638ab96c5 ("media: atomisp: use pin_user_pages() for memory
> > allocation")
> > Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> > Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> > Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
> > Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > ---
> > v2:
> > Added review tag.
>
> Any further comment ? If no, can we get this patch in queue for 5.11 ?
Can we get this patch in the queue for 5.11 ?
> >
> > drivers/staging/media/atomisp/pci/hmm/hmm_bo.c | 13 ++++++++-----
> > 1 file changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c b/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
> > index f13af23..0168f98 100644
> > --- a/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
> > +++ b/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
> > @@ -857,16 +857,17 @@ static void free_private_pages(struct hmm_buffer_object *bo,
> > kfree(bo->page_obj);
> > }
> >
> > -static void free_user_pages(struct hmm_buffer_object *bo)
> > +static void free_user_pages(struct hmm_buffer_object *bo,
> > + unsigned int page_nr)
> > {
> > int i;
> >
> > hmm_mem_stat.usr_size -= bo->pgnr;
> >
> > if (bo->mem_type == HMM_BO_MEM_TYPE_PFN) {
> > - unpin_user_pages(bo->pages, bo->pgnr);
> > + unpin_user_pages(bo->pages, page_nr);
> > } else {
> > - for (i = 0; i < bo->pgnr; i++)
> > + for (i = 0; i < page_nr; i++)
> > put_page(bo->pages[i]);
> > }
> > kfree(bo->pages);
> > @@ -942,6 +943,8 @@ static int alloc_user_pages(struct hmm_buffer_object *bo,
> > dev_err(atomisp_dev,
> > "get_user_pages err: bo->pgnr = %d, pgnr actually pinned = %d.\n",
> > bo->pgnr, page_nr);
> > + if (page_nr < 0)
> > + page_nr = 0;
> > goto out_of_mem;
> > }
> >
> > @@ -954,7 +957,7 @@ static int alloc_user_pages(struct hmm_buffer_object *bo,
> >
> > out_of_mem:
> >
> > - free_user_pages(bo);
> > + free_user_pages(bo, page_nr);
> >
> > return -ENOMEM;
> > }
> > @@ -1037,7 +1040,7 @@ void hmm_bo_free_pages(struct hmm_buffer_object *bo)
> > if (bo->type == HMM_BO_PRIVATE)
> > free_private_pages(bo, &dynamic_pool, &reserved_pool);
> > else if (bo->type == HMM_BO_USER)
> > - free_user_pages(bo);
> > + free_user_pages(bo, bo->pgnr);
> > else
> > dev_err(atomisp_dev, "invalid buffer type.\n");
> > mutex_unlock(&bo->mutex);
> > --
> > 1.9.1
> >
