linux-kernel - [PATCH] drm/bochs: Fix some error handling paths in bochs_pci

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Message-Id: <0e676e4d56ab5b10fcf22860081414445611dfa7.1655565953.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 18 Jun 2022 17:26:08 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Gerd Hoffmann <kraxel@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        virtualization@...ts.linux-foundation.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/bochs: Fix some error handling paths in bochs_pci_probe()

The remove() function calls bochs_hw_fini() but this function is not called
in the error handling of the probe.

This call releases the resources allocated by bochs_hw_init() used in
bochs_load().

Update the probe and bochs_load() to call bochs_hw_fini() if an error
occurs after a successful bochs_hw_init() call.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
I've not been able to find a Fixes: tag because of code re-arrangement
done in 796c3e35ac16.
---
 drivers/gpu/drm/tiny/bochs.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index 4f8bf86633df..d7a34ed4be3e 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -581,13 +581,17 @@ static int bochs_load(struct drm_device *dev)
 
 	ret = drmm_vram_helper_init(dev, bochs->fb_base, bochs->fb_size);
 	if (ret)
-		return ret;
+		goto err_hw_fini;
 
 	ret = bochs_kms_init(bochs);
 	if (ret)
-		return ret;
+		goto err_hw_fini;
 
 	return 0;
+
+err_hw_fini:
+	bochs_hw_fini(dev);
+	return ret;
 }
 
 DEFINE_DRM_GEM_FOPS(bochs_fops);
@@ -662,11 +666,13 @@ static int bochs_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent
 
 	ret = drm_dev_register(dev, 0);
 	if (ret)
-		goto err_free_dev;
+		goto err_hw_fini;
 
 	drm_fbdev_generic_setup(dev, 32);
 	return ret;
 
+err_hw_fini:
+	bochs_hw_fini(dev);
 err_free_dev:
 	drm_dev_put(dev);
 	return ret;
-- 
2.34.1