[PATCH for-rc] RDMA/irdma: Cap MSIX used to online CPUs + 1

[Sindhu Devale <sindhu.devale@intel.com>]

From: Mustafa Ismail <mustafa.ismail@intel.com>

The irdma driver can use a maximum number of msix
vectors equal to num_online_cpus() + 1 and the Kernel
warning stack below is shown if that number is exceeded.
The kernel throws a warning as the driver tries to update
the affinity hint with a CPU mask greater than the max CPU IDs.
Fix this by capping the MSIX vectors to num_online_cpus() + 1.

kernel: WARNING: CPU: 7 PID: 23655 at include/linux/cpumask.h:106 irdma_cfg_ceq_vector+0x34c/0x3f0 [irdma]
kernel: RIP: 0010:irdma_cfg_ceq_vector+0x34c/0x3f0 [irdma]
kernel: Call Trace:
kernel: irdma_rt_init_hw+0xa62/0x1290 [irdma]

Fixes: 44d9e52977a1 ("RDMA/irdma: Implement device initialization definitions")
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Sindhu Devale <sindhu.devale@intel.com>
---
 drivers/infiniband/hw/irdma/hw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/irdma/hw.c b/drivers/infiniband/hw/irdma/hw.c
index ab246447520b..2e1e2bad0401 100644
--- a/drivers/infiniband/hw/irdma/hw.c
+++ b/drivers/infiniband/hw/irdma/hw.c
@@ -483,6 +483,8 @@ static int irdma_save_msix_info(struct irdma_pci_f *rf)
 	iw_qvlist->num_vectors = rf->msix_count;
 	if (rf->msix_count <= num_online_cpus())
 		rf->msix_shared = true;
+	else if (rf->msix_count > num_online_cpus() + 1)
+		rf->msix_count = num_online_cpus() + 1;
 
 	pmsix = rf->msix_entries;
 	for (i = 0, ceq_idx = 0; i < rf->msix_count; i++, iw_qvinfo++) {
-- 
2.27.0