linux-kernel - [PATCH 2/2] drm/mgag200: Fix driver

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Message-Id: <1442487655-9690-2-git-send-email-architt@codeaurora.org>
Date:	Thu, 17 Sep 2015 16:30:55 +0530
From:	Archit Taneja <architt@...eaurora.org>
To:	dri-devel@...ts.freedesktop.org, mingo@...nel.org
Cc:	linux-kernel@...r.kernel.org,
	Archit Taneja <architt@...eaurora.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 2/2] drm/mgag200: Fix driver_load error handling

mgag200_driver_load's error path just calls the drm driver's
driver_unload op. It isn't safe to call this because it doesn't handle
things well if driver_load fails somewhere mid way.

Replace the call to mgag200_driver_unload with a more finegrained
error handling path.

Link: http://lkml.kernel.org/r/55F6E68D.8070800@codeaurora.org
Reported-by: Ingo Molnar <mingo@...nel.org>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Dave Airlie <airlied@...il.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dri-devel <dri-devel@...ts.freedesktop.org>
Signed-off-by: Archit Taneja <architt@...eaurora.org>
---
 drivers/gpu/drm/mgag200/mgag200_main.c | 36 +++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index de06388..b1a0f56 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -220,7 +220,7 @@ int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 	}
 	r = mgag200_mm_init(mdev);
 	if (r)
-		goto out;
+		goto err_mm;
 
 	drm_mode_config_init(dev);
 	dev->mode_config.funcs = (void *)&mga_mode_funcs;
@@ -233,7 +233,7 @@ int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 	r = mgag200_modeset_init(mdev);
 	if (r) {
 		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
-		goto out;
+		goto err_modeset;
 	}
 
 	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
@@ -241,20 +241,24 @@ int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 					  &mdev->cursor.pixels_1);
 	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 					  &mdev->cursor.pixels_2);
-	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1)
-		goto cursor_nospace;
-	mdev->cursor.pixels_current = mdev->cursor.pixels_1;
-	mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
-	goto cursor_done;
- cursor_nospace:
-	mdev->cursor.pixels_1 = NULL;
-	mdev->cursor.pixels_2 = NULL;
-	dev_warn(&dev->pdev->dev, "Could not allocate space for cursors. Not doing hardware cursors.\n");
- cursor_done:
-
-out:
-	if (r)
-		mgag200_driver_unload(dev);
+	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1) {
+		mdev->cursor.pixels_1 = NULL;
+		mdev->cursor.pixels_2 = NULL;
+		dev_warn(&dev->pdev->dev,
+			"Could not allocate space for cursors. Not doing hardware cursors.\n");
+	} else {
+		mdev->cursor.pixels_current = mdev->cursor.pixels_1;
+		mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
+	}
+
+	return 0;
+
+err_modeset:
+	drm_mode_config_cleanup(dev);
+	mgag200_mm_fini(mdev);
+err_mm:
+	dev->dev_private = NULL;
+
 	return r;
 }
 
-- 
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