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Date: Thu, 22 May 2008 22:50:24 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: linux-kernel@...r.kernel.org,
linux-fbdev-devel@...ts.sourceforge.net, adaplas@...il.com
Subject: [PATCH] fb: Push down the BKL in the ioctl handler
Framebuffer is heavily BKL dependant at the moment so just wrap the ioctl
handler in the driver as we push down.
Signed-off-by: Alan Cox <alan@...hat.com>
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 776f7fc..17719a3 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1011,103 +1011,134 @@ fb_blank(struct fb_info *info, int blank)
return ret;
}
-static int
-fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+static long
+fb_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
+ struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
- struct fb_info *info = registered_fb[fbidx];
- struct fb_ops *fb = info->fbops;
+ struct fb_info *info;
+ struct fb_ops *fb;
struct fb_var_screeninfo var;
struct fb_fix_screeninfo fix;
struct fb_con2fbmap con2fb;
struct fb_cmap_user cmap;
struct fb_event event;
void __user *argp = (void __user *)arg;
- int i;
-
- if (!fb)
+ long ret = 0;
+
+ lock_kernel();
+ info = registered_fb[fbidx];
+ fb = info->fbops;
+
+ if (!fb) {
+ unlock_kernel();
return -ENODEV;
+ }
switch (cmd) {
case FBIOGET_VSCREENINFO:
- return copy_to_user(argp, &info->var,
+ ret = copy_to_user(argp, &info->var,
sizeof(var)) ? -EFAULT : 0;
+ break;
case FBIOPUT_VSCREENINFO:
- if (copy_from_user(&var, argp, sizeof(var)))
- return -EFAULT;
+ if (copy_from_user(&var, argp, sizeof(var))) {
+ ret = -EFAULT;
+ break;
+ }
acquire_console_sem();
info->flags |= FBINFO_MISC_USEREVENT;
- i = fb_set_var(info, &var);
+ ret = fb_set_var(info, &var);
info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
- if (i) return i;
- if (copy_to_user(argp, &var, sizeof(var)))
- return -EFAULT;
- return 0;
+ if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
+ ret = -EFAULT;
+ break;
case FBIOGET_FSCREENINFO:
- return copy_to_user(argp, &info->fix,
+ ret = copy_to_user(argp, &info->fix,
sizeof(fix)) ? -EFAULT : 0;
+ break;
case FBIOPUTCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
- return -EFAULT;
- return (fb_set_user_cmap(&cmap, info));
+ ret = -EFAULT;
+ else
+ ret = fb_set_user_cmap(&cmap, info);
+ break;
case FBIOGETCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
- return -EFAULT;
- return fb_cmap_to_user(&info->cmap, &cmap);
+ ret = -EFAULT;
+ else
+ ret = fb_cmap_to_user(&info->cmap, &cmap);
+ break;
case FBIOPAN_DISPLAY:
- if (copy_from_user(&var, argp, sizeof(var)))
- return -EFAULT;
+ if (copy_from_user(&var, argp, sizeof(var))) {
+ ret = -EFAULT;
+ break;
+ }
acquire_console_sem();
- i = fb_pan_display(info, &var);
+ ret = fb_pan_display(info, &var);
release_console_sem();
- if (i)
- return i;
- if (copy_to_user(argp, &var, sizeof(var)))
- return -EFAULT;
- return 0;
+ if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
+ ret = -EFAULT;
+ break;
case FBIO_CURSOR:
- return -EINVAL;
+ ret = -EINVAL;
+ break;
case FBIOGET_CON2FBMAP:
if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
- return -EFAULT;
- if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
- return -EINVAL;
- con2fb.framebuffer = -1;
- event.info = info;
- event.data = &con2fb;
- fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
- return copy_to_user(argp, &con2fb,
+ ret = -EFAULT;
+ else if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
+ ret = -EINVAL;
+ else {
+ con2fb.framebuffer = -1;
+ event.info = info;
+ event.data = &con2fb;
+ fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP,
+ &event);
+ ret = copy_to_user(argp, &con2fb,
sizeof(con2fb)) ? -EFAULT : 0;
+ }
+ break;
case FBIOPUT_CON2FBMAP:
- if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
- return - EFAULT;
- if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
- return -EINVAL;
- if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
- return -EINVAL;
+ if (copy_from_user(&con2fb, argp, sizeof(con2fb))) {
+ ret = - EFAULT;
+ break;
+ }
+ if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) {
+ ret = -EINVAL;
+ break;
+ }
+ if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) {
+ ret = -EINVAL;
+ break;
+ }
#ifdef CONFIG_KMOD
if (!registered_fb[con2fb.framebuffer])
- try_to_load(con2fb.framebuffer);
+ try_to_load(con2fb.framebuffer);
#endif /* CONFIG_KMOD */
- if (!registered_fb[con2fb.framebuffer])
- return -EINVAL;
+ if (!registered_fb[con2fb.framebuffer]) {
+ ret = -EINVAL;
+ break;
+ }
event.info = info;
event.data = &con2fb;
- return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
+ ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
&event);
+ break;
case FBIOBLANK:
acquire_console_sem();
info->flags |= FBINFO_MISC_USEREVENT;
- i = fb_blank(info, arg);
+ ret = fb_blank(info, arg);
info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
- return i;
+ break;;
default:
if (fb->fb_ioctl == NULL)
- return -EINVAL;
- return fb->fb_ioctl(info, cmd, arg);
+ ret = -ENOTTY;
+ else
+ ret = fb->fb_ioctl(info, cmd, arg);
}
+ unlock_kernel();
+ return ret;
}
#ifdef CONFIG_COMPAT
@@ -1161,7 +1192,7 @@ static int fb_getput_cmap(struct inode *inode, struct file *file,
put_user(compat_ptr(data), &cmap->transp))
return -EFAULT;
- err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
+ err = fb_ioctl(file, cmd, (unsigned long) cmap);
if (!err) {
if (copy_in_user(&cmap32->start,
@@ -1215,7 +1246,7 @@ static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
old_fs = get_fs();
set_fs(KERNEL_DS);
- err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
+ err = fb_ioctl(file, cmd, (unsigned long) &fix);
set_fs(old_fs);
if (!err)
@@ -1242,7 +1273,7 @@ fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FBIOPUT_CON2FBMAP:
arg = (unsigned long) compat_ptr(arg);
case FBIOBLANK:
- ret = fb_ioctl(inode, file, cmd, arg);
+ ret = fb_ioctl(file, cmd, arg);
break;
case FBIOGET_FSCREENINFO:
@@ -1360,7 +1391,7 @@ static const struct file_operations fb_fops = {
.owner = THIS_MODULE,
.read = fb_read,
.write = fb_write,
- .ioctl = fb_ioctl,
+ .unlocked_ioctl = fb_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = fb_compat_ioctl,
#endif
--
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