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IB/srp: Fix infinite loop when FMR sg[0].offset != 0

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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 8c4037b501 ("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>
This commit is contained in:
Bart Van Assche 2016-09-26 12:58:49 -07:00 committed by Doug Ledford
parent 52bb8c626e
commit 681cc36083
1 changed files with 5 additions and 3 deletions
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8
drivers/infiniband/ulp/srp/ib_srp.c
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@ -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;
}