Hey Bernard, is the code below called directly from the driver’s post_send function? If so it must use atomic...I think.
Stevo
> On Sep 6, 2019, at 6:18 AM, Bernard Metzler <bmt@xxxxxxxxxxxxxx> wrote:
>
> Since the transmit path is never executed in an atomic
> context, we do not need kmap_atomic() and can always
> use less demanding kmap().
>
> Signed-off-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
> ---
> drivers/infiniband/sw/siw/siw_qp_tx.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
> index 8e72f955921d..5d97bba0ce6d 100644
> --- a/drivers/infiniband/sw/siw/siw_qp_tx.c
> +++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
> @@ -76,16 +76,15 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
> if (unlikely(!p))
> return -EFAULT;
>
> - buffer = kmap_atomic(p);
> + buffer = kmap(p);
>
> if (likely(PAGE_SIZE - off >= bytes)) {
> memcpy(paddr, buffer + off, bytes);
> - kunmap_atomic(buffer);
> } else {
> unsigned long part = bytes - (PAGE_SIZE - off);
>
> memcpy(paddr, buffer + off, part);
> - kunmap_atomic(buffer);
> + kunmap(p);
>
> if (!mem->is_pbl)
> p = siw_get_upage(mem->umem,
> @@ -97,11 +96,10 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
> if (unlikely(!p))
> return -EFAULT;
>
> - buffer = kmap_atomic(p);
> - memcpy(paddr + part, buffer,
> - bytes - part);
> - kunmap_atomic(buffer);
> + buffer = kmap(p);
> + memcpy(paddr + part, buffer, bytes - part);
> }
> + kunmap(p);
> }
> }
> return (int)bytes;
> --
> 2.17.2
>
