> On Mar 4, 2014, at 8:00 PM, "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx> wrote:
>
>> On Tue, Mar 04, 2014 at 12:30:54PM -0600, Joel Fernandes wrote:
>> HIGHMEM pages may not be mapped so we must kmap them before accessing.
>> This resolves a random OOPs error that was showing up during OpenSSL SHA tests.
>>
>> Signed-off-by: Joel Fernandes <joelf@xxxxxx>
>> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
>> ---
>> v2 changes:
>> - don't check for HIGHMEM, kmap/kunmap do them anyway (Thanks Herbert).
>>
>> drivers/crypto/omap-sham.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
>> index e45aaaf..207eac1 100644
>> --- a/drivers/crypto/omap-sham.c
>> +++ b/drivers/crypto/omap-sham.c
>> @@ -636,11 +636,17 @@ static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
>> static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
>> {
>> size_t count;
>> + const u8 *vaddr;
>>
>> while (ctx->sg) {
>> + vaddr = kmap(sg_page(ctx->sg));
>
> Are you sure you can safely use kmap here as opposed to kmap_atomic?
Yes I made sure it is not called in interrupt context and also tested the patch.
Regards,
-Joel
>
> Thanks,
> --
> Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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