diff options
| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2016-09-26 22:58:49 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-10-07 23:54:39 +0300 |
| commit | 681cc3608355737c1effebc8145f95c8c3344bc3 (patch) | |
| tree | 440c6dc95990989c80eaeac571a01c88efce3d7a /drivers | |
| parent | 52bb8c626e0e5526c72b6ad17f1381f0bad283cc (diff) | |
| download | linux-681cc3608355737c1effebc8145f95c8c3344bc3.tar.xz | |
IB/srp: Fix infinite loop when FMR sg[0].offset != 0
Avoid that mapping an sg-list in which the first element has a
non-zero offset triggers an infinite loop when using FMR. This
patch makes the FMR mapping code similar to that of ib_sg_to_pages().
Note: older Mellanox HCAs do not support non-zero offsets for FMR.
See also commit 8c4037b501ac ("IB/srp: always avoid non-zero offsets
into an FMR").
Reported-by: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 60031b9159d9..d980fb458ad4 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1402,7 +1402,9 @@ static int srp_map_sg_entry(struct srp_map_state *state, while (dma_len) { unsigned offset = dma_addr & ~dev->mr_page_mask; - if (state->npages == dev->max_pages_per_mr || offset != 0) { + + if (state->npages == dev->max_pages_per_mr || + (state->npages > 0 && offset != 0)) { ret = srp_map_finish_fmr(state, ch); if (ret) return ret; @@ -1419,12 +1421,12 @@ static int srp_map_sg_entry(struct srp_map_state *state, } /* - * If the last entry of the MR wasn't a full page, then we need to + * If the end of the MR is not on a page boundary then we need to * close it out and start a new one -- we can only merge at page * boundaries. */ ret = 0; - if (len != dev->mr_page_size) + if ((dma_addr & ~dev->mr_page_mask) != 0) ret = srp_map_finish_fmr(state, ch); return ret; } |