diff options
Diffstat (limited to 'drivers/video/fbdev/core/fb_sys_fops.c')
-rw-r--r-- | drivers/video/fbdev/core/fb_sys_fops.c | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/drivers/video/fbdev/core/fb_sys_fops.c b/drivers/video/fbdev/core/fb_sys_fops.c index ff275d7f3eaf..0cb0989abda6 100644 --- a/drivers/video/fbdev/core/fb_sys_fops.c +++ b/drivers/video/fbdev/core/fb_sys_fops.c @@ -19,10 +19,11 @@ ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count, unsigned long p = *ppos; void *src; int err = 0; - unsigned long total_size; + unsigned long total_size, c; + ssize_t ret; - if (info->state != FBINFO_STATE_RUNNING) - return -EPERM; + if (!info->screen_buffer) + return -ENODEV; total_size = info->screen_size; @@ -38,18 +39,19 @@ ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count, if (count + p > total_size) count = total_size - p; - src = (void __force *)(info->screen_base + p); + src = info->screen_buffer + p; if (info->fbops->fb_sync) info->fbops->fb_sync(info); - if (copy_to_user(buf, src, count)) + c = copy_to_user(buf, src, count); + if (c) err = -EFAULT; + ret = count - c; - if (!err) - *ppos += count; + *ppos += ret; - return (err) ? err : count; + return ret ? ret : err; } EXPORT_SYMBOL_GPL(fb_sys_read); @@ -59,10 +61,11 @@ ssize_t fb_sys_write(struct fb_info *info, const char __user *buf, unsigned long p = *ppos; void *dst; int err = 0; - unsigned long total_size; + unsigned long total_size, c; + size_t ret; - if (info->state != FBINFO_STATE_RUNNING) - return -EPERM; + if (!info->screen_buffer) + return -ENODEV; total_size = info->screen_size; @@ -84,18 +87,19 @@ ssize_t fb_sys_write(struct fb_info *info, const char __user *buf, count = total_size - p; } - dst = (void __force *) (info->screen_base + p); + dst = info->screen_buffer + p; if (info->fbops->fb_sync) info->fbops->fb_sync(info); - if (copy_from_user(dst, buf, count)) + c = copy_from_user(dst, buf, count); + if (c) err = -EFAULT; + ret = count - c; - if (!err) - *ppos += count; + *ppos += ret; - return (err) ? err : count; + return ret ? ret : err; } EXPORT_SYMBOL_GPL(fb_sys_write); |