IB/ehca: Use proper GFP_ flags for get_zeroed_page()

Here is a patch for ehca to use proper flag, ie. GFP_ATOMIC
resp. GFP_KERNEL, when calling get_zeroed_page() to prevent "Bug:
scheduling while atomic...". This error does not cause a kernel panic
but makes ipoib un-usable afterwards.  It is reproducible on
2.6.20-rc4 if one does ifconfig down during a flood ping test.  I have
not observed this error in earlier releases incl. 2.6.20-rc1.

This error occurs when a qp event/irq is received and ehca event
handler allocates a control block/page to obtain HCA error data block.
Use of GFP_ATOMIC when in interrupt context prevents this issue.

Signed-off-by Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c
index 0a5e2214cc5f..cfb362a1029c 100644
--- a/drivers/infiniband/hw/ehca/ehca_mrmw.c
+++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c
@@ -1013,7 +1013,7 @@ int ehca_reg_mr_rpages(struct ehca_shca *shca,
         u32 i;
         u64 *kpage;
 
-        kpage = ehca_alloc_fw_ctrlblock();
+        kpage = ehca_alloc_fw_ctrlblock(GFP_KERNEL);
         if (!kpage) {
                 ehca_err(&shca->ib_device, "kpage alloc failed");
                 ret = -ENOMEM;
@@ -1124,7 +1124,7 @@ inline int ehca_rereg_mr_rereg1(struct ehca_shca *shca,
         ehca_mrmw_map_acl(acl, &hipz_acl);
         ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);
 
-        kpage = ehca_alloc_fw_ctrlblock();
+        kpage = ehca_alloc_fw_ctrlblock(GFP_KERNEL);
         if (!kpage) {
                 ehca_err(&shca->ib_device, "kpage alloc failed");
                 ret = -ENOMEM;