[PATCH] mailbox: fix return value check in zynqmp_ipi_mbox_probe

[Ding Xiang]

If devm_ioremap() failed, it will return NULL pointer not
ERR_PTR(). So, use NULL test instead of IS_ERR() test.

Signed-off-by: Ding Xiang <dingxi...@cmss.chinamobile.com>
---
 drivers/mailbox/zynqmp-ipi-mailbox.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c 
b/drivers/mailbox/zynqmp-ipi-mailbox.c
index 86887c9..660a8d2 100644
--- a/drivers/mailbox/zynqmp-ipi-mailbox.c
+++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
@@ -504,9 +504,9 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox 
*ipi_mbox,
                mchan->req_buf_size = resource_size(&res);
                mchan->req_buf = devm_ioremap(mdev, res.start,
                                              mchan->req_buf_size);
-               if (IS_ERR(mchan->req_buf)) {
+               if (!mchan->req_buf) {
                        dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
-                       ret = PTR_ERR(mchan->req_buf);
+                       ret = -ENOMEM;
                        return ret;
                }
        } else if (ret != -ENODEV) {
@@ -520,9 +520,9 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox 
*ipi_mbox,
                mchan->resp_buf_size = resource_size(&res);
                mchan->resp_buf = devm_ioremap(mdev, res.start,
                                               mchan->resp_buf_size);
-               if (IS_ERR(mchan->resp_buf)) {
+               if (!mchan->resp_buf) {
                        dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
-                       ret = PTR_ERR(mchan->resp_buf);
+                       ret = -ENOMEM;
                        return ret;
                }
        } else if (ret != -ENODEV) {
@@ -543,9 +543,9 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox 
*ipi_mbox,
                mchan->req_buf_size = resource_size(&res);
                mchan->req_buf = devm_ioremap(mdev, res.start,
                                              mchan->req_buf_size);
-               if (IS_ERR(mchan->req_buf)) {
+               if (!mchan->req_buf) {
                        dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
-                       ret = PTR_ERR(mchan->req_buf);
+                       ret = -ENOMEM;
                        return ret;
                }
        } else if (ret != -ENODEV) {
@@ -559,9 +559,9 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox 
*ipi_mbox,
                mchan->resp_buf_size = resource_size(&res);
                mchan->resp_buf = devm_ioremap(mdev, res.start,
                                               mchan->resp_buf_size);
-               if (IS_ERR(mchan->resp_buf)) {
+               if (!mchan->resp_buf) {
                        dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
-                       ret = PTR_ERR(mchan->resp_buf);
+                       ret = -ENOMEM;
                        return ret;
                }
        } else if (ret != -ENODEV) {
-- 
1.9.1