linux-kernel - [PATCH v4 2/17] video: fbdev: gbefb: add missing mtrr

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Message-Id: <1432859434-17821-2-git-send-email-mcgrof@do-not-panic.com>
Date:	Thu, 28 May 2015 17:30:33 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	tomi.valkeinen@...com
Cc:	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Masanari Iida <standby24x7@...il.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andy Lutomirski <luto@...capital.net>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Subject: [PATCH v4 2/17] video: fbdev: gbefb: add missing mtrr_del() calls

From: "Luis R. Rodriguez" <mcgrof@...e.com>

This driver never removed the MTRRs. Fix that.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Juergen Gross <jgross@...e.com>
Cc: Jingoo Han <jg1.han@...sung.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Masanari Iida <standby24x7@...il.com>
Cc: Suresh Siddha <sbsiddha@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Antonino Daplas <adaplas@...il.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: linux-fbdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
---
 drivers/video/fbdev/gbefb.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index 6d9ef39..4e54faa06 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -38,6 +38,7 @@ static struct sgi_gbe *gbe;
 struct gbefb_par {
 	struct fb_var_screeninfo var;
 	struct gbe_timing_info timing;
+	int wc_cookie;
 	int valid;
 };
 
@@ -1198,8 +1199,10 @@ static int gbefb_probe(struct platform_device *p_dev)
 		gbe_mem_phys = (unsigned long) gbe_dma_addr;
 	}
 
+	par = info->par;
 #ifdef CONFIG_X86
-	mtrr_add(gbe_mem_phys, gbe_mem_size, MTRR_TYPE_WRCOMB, 1);
+	par->wc_cookie = mtrr_add(gbe_mem_phys, gbe_mem_size,
+				   MTRR_TYPE_WRCOMB, 1);
 #endif
 
 	/* map framebuffer memory into tiles table */
@@ -1215,7 +1218,6 @@ static int gbefb_probe(struct platform_device *p_dev)
 	/* reset GBE */
 	gbe_reset();
 
-	par = info->par;
 	/* turn on default video mode */
 	if (fb_find_mode(&par->var, info, mode_option, NULL, 0,
 			 default_mode, 8) == 0)
@@ -1240,6 +1242,10 @@ static int gbefb_probe(struct platform_device *p_dev)
 	return 0;
 
 out_gbe_unmap:
+#ifdef CONFIG_MTRR
+	if (par->wc_cookie >= 0)
+		mtrr_del(par->wc_cookie, 0, 0);
+#endif
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 out_tiles_free:
@@ -1256,9 +1262,14 @@ out_release_framebuffer:
 static int gbefb_remove(struct platform_device* p_dev)
 {
 	struct fb_info *info = platform_get_drvdata(p_dev);
+	struct gbefb_par *par = info->par;
 
 	unregister_framebuffer(info);
 	gbe_turn_off();
+#ifdef CONFIG_MTRR
+	if (par->wc_cookie >= 0)
+		mtrr_del(par->wc_cookie, 0, 0);
+#endif
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 	dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-- 
2.3.2.209.gd67f9d5.dirty

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