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| author | David Herrmann <dh.herrmann@gmail.com> | 2013-10-02 16:58:38 +0200 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2013-10-30 12:49:01 +0200 |
| commit | 498f6d3660e8c3343b26a5f8e2707b642bcf3fc8 (patch) | |
| tree | 6b2951e6972aa146d6ca8c99e60724ccb8a84ef6 | |
| parent | cc9fd77c08940c869cdfa38442f32458c5be900c (diff) | |
| download | linux-498f6d3660e8c3343b26a5f8e2707b642bcf3fc8.tar.gz linux-498f6d3660e8c3343b26a5f8e2707b642bcf3fc8.tar.bz2 linux-498f6d3660e8c3343b26a5f8e2707b642bcf3fc8.zip | |
simplefb: fix unmapping fb during destruction
Unfortunately, fbdev does not create its own "struct device" for
framebuffers. Instead, it attaches to the device of the parent layer. This
has the side-effect that devm_* managed resources are not cleaned up on
framebuffer-destruction but rather during destruction of the
parent-device. In case of fbdev this might be too late, though.
remove_conflicting_framebuffer() may remove fbdev devices but keep the
parent device as it is.
Therefore, we now use plain ioremap() and unmap the framebuffer in the
fb_destroy() callback. Note that we must not free the device here as this
might race with the parent-device removal. Instead, we rely on
unregister_framebuffer() as barrier and we're safe.
Reported-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
| -rw-r--r-- | drivers/video/simplefb.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c index 08c764cfeff3..129ab19732c7 100644 --- a/drivers/video/simplefb.c +++ b/drivers/video/simplefb.c @@ -66,8 +66,15 @@ static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, return 0; } +static void simplefb_destroy(struct fb_info *info) +{ + if (info->screen_base) + iounmap(info->screen_base); +} + static struct fb_ops simplefb_ops = { .owner = THIS_MODULE, + .fb_destroy = simplefb_destroy, .fb_setcolreg = simplefb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, @@ -212,8 +219,8 @@ static int simplefb_probe(struct platform_device *pdev) info->fbops = &simplefb_ops; info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE; - info->screen_base = devm_ioremap(&pdev->dev, info->fix.smem_start, - info->fix.smem_len); + info->screen_base = ioremap(info->fix.smem_start, + info->fix.smem_len); if (!info->screen_base) { framebuffer_release(info); return -ENODEV; @@ -231,6 +238,7 @@ static int simplefb_probe(struct platform_device *pdev) ret = register_framebuffer(info); if (ret < 0) { dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret); + iounmap(info->screen_base); framebuffer_release(info); return ret; } |