linux-kernel - [PATCH 5.4 01/16] drm: remove drm_fb_helper

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Date:   Thu, 30 Jun 2022 15:46:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>,
        Christoph Hellwig <hch@....de>, Jessica Yu <jeyu@...nel.org>
Subject: [PATCH 5.4 01/16] drm: remove drm_fb_helper_modinit

From: Christoph Hellwig <hch@....de>

commit bf22c9ec39da90ce866d5f625d616f28bc733dc1 upstream.

drm_fb_helper_modinit has a lot of boilerplate for what is not very
simple functionality.  Just open code it in the only caller using
IS_ENABLED and IS_MODULE, and skip the find_module check as a
request_module is harmless if the module is already loaded (and not
other caller has this find_module check either).

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jessica Yu <jeyu@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/drm_crtc_helper_internal.h |   10 ----------
 drivers/gpu/drm/drm_fb_helper.c            |   21 ---------------------
 drivers/gpu/drm/drm_kms_helper_common.c    |   23 +++++++++++------------
 3 files changed, 11 insertions(+), 43 deletions(-)

--- a/drivers/gpu/drm/drm_crtc_helper_internal.h
+++ b/drivers/gpu/drm/drm_crtc_helper_internal.h
@@ -32,16 +32,6 @@
 #include <drm/drm_encoder.h>
 #include <drm/drm_modes.h>
 
-/* drm_fb_helper.c */
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-int drm_fb_helper_modinit(void);
-#else
-static inline int drm_fb_helper_modinit(void)
-{
-	return 0;
-}
-#endif
-
 /* drm_dp_aux_dev.c */
 #ifdef CONFIG_DRM_DP_AUX_CHARDEV
 int drm_dp_aux_dev_init(void);
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2415,24 +2415,3 @@ int drm_fbdev_generic_setup(struct drm_d
 	return 0;
 }
 EXPORT_SYMBOL(drm_fbdev_generic_setup);
-
-/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
- * but the module doesn't depend on any fb console symbols.  At least
- * attempt to load fbcon to avoid leaving the system without a usable console.
- */
-int __init drm_fb_helper_modinit(void)
-{
-#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
-	const char name[] = "fbcon";
-	struct module *fbcon;
-
-	mutex_lock(&module_mutex);
-	fbcon = find_module(name);
-	mutex_unlock(&module_mutex);
-
-	if (!fbcon)
-		request_module_nowait(name);
-#endif
-	return 0;
-}
-EXPORT_SYMBOL(drm_fb_helper_modinit);
--- a/drivers/gpu/drm/drm_kms_helper_common.c
+++ b/drivers/gpu/drm/drm_kms_helper_common.c
@@ -64,19 +64,18 @@ MODULE_PARM_DESC(edid_firmware,
 
 static int __init drm_kms_helper_init(void)
 {
-	int ret;
+	/*
+	 * The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
+	 * but the module doesn't depend on any fb console symbols.  At least
+	 * attempt to load fbcon to avoid leaving the system without a usable
+	 * console.
+	 */
+	if (IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION) &&
+	    IS_MODULE(CONFIG_FRAMEBUFFER_CONSOLE) &&
+	    !IS_ENABLED(CONFIG_EXPERT))
+		request_module_nowait("fbcon");
 
-	/* Call init functions from specific kms helpers here */
-	ret = drm_fb_helper_modinit();
-	if (ret < 0)
-		goto out;
-
-	ret = drm_dp_aux_dev_init();
-	if (ret < 0)
-		goto out;
-
-out:
-	return ret;
+	return drm_dp_aux_dev_init();
 }
 
 static void __exit drm_kms_helper_exit(void)