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RDMA/mlx5: Don't assume that medium blueFlame register exists

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User can leave system without medium BlueFlames registers,
however the code assumed that at least one such register exists.

This patch fixes that assumption.

Fixes: c1be5232d2 ("IB/mlx5: Fix micro UAR allocator")
Reported-by: Rohit Zambre <rzambre@uci.edu>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Yishai Hadas 2018-05-07 10:20:01 +03:00 committed by Doug Ledford
parent f9e76ca377
commit 18b0362e87
1 changed files with 11 additions and 7 deletions
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18
drivers/infiniband/hw/mlx5/qp.c
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@ -484,11 +484,6 @@ static int qp_has_rq(struct ib_qp_init_attr *attr)
return 1;
}
static int first_med_bfreg(void)
{
return 1;
}
enum {
/* this is the first blue flame register in the array of bfregs assigned
* to a processes. Since we do not use it for blue flame but rather
@ -514,6 +509,12 @@ static int num_med_bfreg(struct mlx5_ib_dev *dev,
return n >= 0 ? n : 0;
}
static int first_med_bfreg(struct mlx5_ib_dev *dev,
struct mlx5_bfreg_info *bfregi)
{
return num_med_bfreg(dev, bfregi) ? 1 : -ENOMEM;
}
static int first_hi_bfreg(struct mlx5_ib_dev *dev,
struct mlx5_bfreg_info *bfregi)
{
@ -541,10 +542,13 @@ static int alloc_high_class_bfreg(struct mlx5_ib_dev *dev,
static int alloc_med_class_bfreg(struct mlx5_ib_dev *dev,
struct mlx5_bfreg_info *bfregi)
{
int minidx = first_med_bfreg();
int minidx = first_med_bfreg(dev, bfregi);
int i;
for (i = first_med_bfreg(); i < first_hi_bfreg(dev, bfregi); i++) {
if (minidx < 0)
return minidx;
for (i = minidx; i < first_hi_bfreg(dev, bfregi); i++) {
if (bfregi->count[i] < bfregi->count[minidx])
minidx = i;
if (!bfregi->count[minidx])