[PATCH V4] IB/qib: fix test of unsigned variable

[Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Commit d4988623cc60 ("IB/qib: use arch_phys_wc_add()")
adjusted mtrr inititialization to use the new interface.

Unfortunately, the new interface returns a signed
value and the patch tested the unsigned wc_cookie.

Fix the issue by changing the type of wc_cookie to int.  For
the success case the ret left at zero to avoid
a warning from the caller.  For failure wc_cookie
is used as the ret.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 drivers/infiniband/hw/qib/qib.h           |    2 +-
 drivers/infiniband/hw/qib/qib_wc_x86_64.c |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index ba5173e2..7df16f7 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -903,7 +903,7 @@ struct qib_devdata {
 	/* PCI Device ID (here for NodeInfo) */
 	u16 deviceid;
 	/* for write combining settings */
-	unsigned long wc_cookie;
+	int wc_cookie;
 	unsigned long wc_base;
 	unsigned long wc_len;
 
diff --git a/drivers/infiniband/hw/qib/qib_wc_x86_64.c b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
index 6d61ef9..edd0ddb 100644
--- a/drivers/infiniband/hw/qib/qib_wc_x86_64.c
+++ b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
@@ -118,7 +118,8 @@ int qib_enable_wc(struct qib_devdata *dd)
 	if (!ret) {
 		dd->wc_cookie = arch_phys_wc_add(pioaddr, piolen);
 		if (dd->wc_cookie < 0)
-			ret = -EINVAL;
+			/* use error from routine */
+			ret = dd->wc_cookie;
 	}
 
 	return ret;

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