On 9/16/2016 12:06 PM, Catalin Vasile wrote:
> Ensure scatterlists have a virtual memory mapping before dumping.
>
> Signed-off-by: Catalin Vasile <cata.vasile@xxxxxxx>
> ---
> drivers/crypto/caam/caamalg.c | 65 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 50 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
> index 6dc5971..49f1ea7 100644
> --- a/drivers/crypto/caam/caamalg.c
> +++ b/drivers/crypto/caam/caamalg.c
> @@ -111,6 +111,41 @@
> #else
> #define debug(format, arg...)
> #endif
> +
> +#ifdef DEBUG
> +#include <linux/highmem.h>
> +
> +static void dbg_dump_sg(const char *level, const char *prefix_str,
> + int prefix_type, int rowsize, int groupsize,
> + struct scatterlist *sg, size_t tlen, bool ascii)
> +{
> + struct scatterlist *it;
> + size_t len;
> + void *buf;
> +
> + for (it = sg; it != NULL && tlen > 0 ; it = sg_next(sg)) {
> + /*
> + * make sure the scatterlist's page
> + * has a valid virtual memory mapping
> + */
> + buf = kmap(sg_page(it));
Even though driver has been updated recently to use threaded irq instead
of tasklet, there are still cases when you are not allowed to sleep here.
You should check this and use kmap_atomic when needed.
Horia
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