linux-kernel - [PATCH -next] drm/vmwgfx: Fix return value check in vmw_setup_pci

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Date:   Fri, 14 May 2021 16:28:12 +0800
From:   Qiheng Lin <linqiheng@...wei.com>
To:     <linqiheng@...wei.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next] drm/vmwgfx: Fix return value check in vmw_setup_pci_resources()

In case of error, the function devm_ioremap() returns NULL pointer not ERR_PTR().
The IS_ERR() test in the return value check should be replaced with NULL test.
After that, the error code -ENOMEM should be returned.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qiheng Lin <linqiheng@...wei.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 5cf3a5bf539f..6f5ea00973e0 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -719,10 +719,10 @@ static int vmw_setup_pci_resources(struct vmw_private *dev,
 		dev->rmmio = devm_ioremap(dev->drm.dev,
 					  rmmio_start,
 					  rmmio_size);
-		if (IS_ERR(dev->rmmio)) {
+		if (!dev->rmmio) {
 			DRM_ERROR("Failed mapping registers mmio memory.\n");
 			pci_release_regions(pdev);
-			return PTR_ERR(dev->rmmio);
+			return -ENOMEM;
 		}
 	} else if (pci_id == VMWGFX_PCI_ID_SVGA2) {
 		dev->io_start = pci_resource_start(pdev, 0);