On 2/11/2019 7:09 AM, Christoph Hellwig wrote:
> We need to ensure rbu_data.lock is always held on return.
>
> Fixes: 289790a3ea94 ("platform/x86: dell_rbu: stop abusing the DMA API")
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> drivers/platform/x86/dell_rbu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/dell_rbu.c b/drivers/platform/x86/dell_rbu.c
> index 8104ca0c44ca..031c68903583 100644
> --- a/drivers/platform/x86/dell_rbu.c
> +++ b/drivers/platform/x86/dell_rbu.c
> @@ -436,6 +436,7 @@ static int img_update_realloc(unsigned long size)
> ordernum = get_order(size);
> image_update_buffer =
> (unsigned char *)__get_free_pages(GFP_DMA32, ordernum);
> + spin_lock(&rbu_data.lock);
> if (!image_update_buffer) {
> pr_debug("Not enough memory for image update:"
> "size = %ld\n", size);
> @@ -446,7 +447,6 @@ static int img_update_realloc(unsigned long size)
> if (WARN_ON_ONCE(img_buf_phys_addr > BIOS_SCAN_LIMIT))
> return -EINVAL; /* can't happen per definition */
>
> - spin_lock(&rbu_data.lock);
> rbu_data.image_update_buffer = image_update_buffer;
> rbu_data.image_update_buffer_size = size;
> rbu_data.bios_image_size = rbu_data.image_update_buffer_size;
>
Acked-by: Stuart Hayes <stuart.w.hayes@xxxxxxxxx>
