Re: [PATCH v5 03/10] DMA reservations: use the new mmap locking API

[Laurent Dufour <ldufour@linux.ibm.com>]

Le 22/04/2020 à 02:14, Michel Lespinasse a écrit :
> This use is converted manually ahead of the next patch in the series,
> as it requires including a new header which the automated conversion
> would miss.
> 
> Signed-off-by: Michel Lespinasse <walken@google.com>
> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>

Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>

> ---
>   drivers/dma-buf/dma-resv.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
> index 4264e64788c4..b45f8514dc82 100644
> --- a/drivers/dma-buf/dma-resv.c
> +++ b/drivers/dma-buf/dma-resv.c
> @@ -34,6 +34,7 @@
>   
>   #include <linux/dma-resv.h>
>   #include <linux/export.h>
> +#include <linux/mm.h>
>   #include <linux/sched/mm.h>
>   
>   /**
> @@ -109,7 +110,7 @@ static int __init dma_resv_lockdep(void)
>   
>   	dma_resv_init(&obj);
>   
> -	down_read(&mm->mmap_sem);
> +	mmap_read_lock(mm);
>   	ww_acquire_init(&ctx, &reservation_ww_class);
>   	ret = dma_resv_lock(&obj, &ctx);
>   	if (ret == -EDEADLK)
> @@ -118,7 +119,7 @@ static int __init dma_resv_lockdep(void)
>   	fs_reclaim_release(GFP_KERNEL);
>   	ww_mutex_unlock(&obj.lock);
>   	ww_acquire_fini(&ctx);
> -	up_read(&mm->mmap_sem);
> +	mmap_read_unlock(mm);
>   	
>   	mmput(mm);
>   
>