fbdev: add mutex for fb_mmap locking

[pandora-kernel.git] / drivers / video / matrox / matroxfb_base.c

diff --git a/drivers/video/matrox/matroxfb_base.c b/drivers/video/matrox/matroxfb_base.c
index 8e7a275..59c3a2e 100644 (file)
--- a/drivers/video/matrox/matroxfb_base.c
+++ b/drivers/video/matrox/matroxfb_base.c
@@ -724,8 +724,10 @@ static void matroxfb_update_fix(WPMINFO2)
        struct fb_fix_screeninfo *fix = &ACCESS_FBINFO(fbcon).fix;
        DBG(__func__)
 
+       mutex_lock(&ACCESS_FBINFO(fbcon).mm_lock);
        fix->smem_start = ACCESS_FBINFO(video.base) + ACCESS_FBINFO(curr.ydstorg.bytes);
        fix->smem_len = ACCESS_FBINFO(video.len_usable) - ACCESS_FBINFO(curr.ydstorg.bytes);
+       mutex_unlock(&ACCESS_FBINFO(fbcon).mm_lock);
 }
 
 static int matroxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
@@ -2081,6 +2083,7 @@ static int matroxfb_probe(struct pci_dev* pdev, const struct pci_device_id* dumm
        spin_lock_init(&ACCESS_FBINFO(lock.accel));
        init_rwsem(&ACCESS_FBINFO(crtc2.lock));
        init_rwsem(&ACCESS_FBINFO(altout.lock));
+       mutex_init(&ACCESS_FBINFO(fbcon).mm_lock);
        ACCESS_FBINFO(irq_flags) = 0;
        init_waitqueue_head(&ACCESS_FBINFO(crtc1.vsync.wait));
        init_waitqueue_head(&ACCESS_FBINFO(crtc2.vsync.wait));