fb: convert lock/unlock_kernel() into local fb mutex
Change lock_kernel()/unlock_kernel() to local fb mutex. Each frame buffer instance has its own mutex. The one line try_to_load() function is unrolled to request_module() in two places for readability. [righi.andrea@gmail.com: fb: fix NULL pointer BUG dereference in fb_open()] Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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e53677113e
Коммит
3e680aae4e
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@ -1018,12 +1018,12 @@ fb_ioctl(struct file *file, unsigned int cmd,
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void __user *argp = (void __user *)arg;
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long ret = 0;
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lock_kernel();
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info = registered_fb[fbidx];
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mutex_lock(&info->lock);
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fb = info->fbops;
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if (!fb) {
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unlock_kernel();
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mutex_unlock(&info->lock);
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return -ENODEV;
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}
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switch (cmd) {
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@ -1126,7 +1126,7 @@ fb_ioctl(struct file *file, unsigned int cmd,
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else
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ret = fb->fb_ioctl(info, cmd, arg);
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}
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unlock_kernel();
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mutex_unlock(&info->lock);
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return ret;
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}
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@ -1253,7 +1253,7 @@ fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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struct fb_ops *fb = info->fbops;
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long ret = -ENOIOCTLCMD;
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lock_kernel();
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mutex_lock(&info->lock);
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switch(cmd) {
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case FBIOGET_VSCREENINFO:
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case FBIOPUT_VSCREENINFO:
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@ -1279,7 +1279,7 @@ fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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ret = fb->fb_compat_ioctl(info, cmd, arg);
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break;
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}
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unlock_kernel();
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mutex_unlock(&info->lock);
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return ret;
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}
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#endif
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@ -1301,13 +1301,13 @@ fb_mmap(struct file *file, struct vm_area_struct * vma)
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return -ENODEV;
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if (fb->fb_mmap) {
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int res;
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lock_kernel();
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mutex_lock(&info->lock);
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res = fb->fb_mmap(info, vma);
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unlock_kernel();
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mutex_unlock(&info->lock);
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return res;
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}
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lock_kernel();
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mutex_lock(&info->lock);
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/* frame buffer memory */
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start = info->fix.smem_start;
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@ -1316,13 +1316,13 @@ fb_mmap(struct file *file, struct vm_area_struct * vma)
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/* memory mapped io */
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off -= len;
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if (info->var.accel_flags) {
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unlock_kernel();
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mutex_unlock(&info->lock);
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return -EINVAL;
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}
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start = info->fix.mmio_start;
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len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
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}
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unlock_kernel();
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mutex_unlock(&info->lock);
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start &= PAGE_MASK;
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if ((vma->vm_end - vma->vm_start + off) > len)
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return -EINVAL;
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@ -1346,13 +1346,13 @@ fb_open(struct inode *inode, struct file *file)
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if (fbidx >= FB_MAX)
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return -ENODEV;
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lock_kernel();
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if (!(info = registered_fb[fbidx]))
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info = registered_fb[fbidx];
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if (!info)
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request_module("fb%d", fbidx);
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if (!(info = registered_fb[fbidx])) {
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res = -ENODEV;
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goto out;
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}
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info = registered_fb[fbidx];
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if (!info)
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return -ENODEV;
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mutex_lock(&info->lock);
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if (!try_module_get(info->fbops->owner)) {
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res = -ENODEV;
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goto out;
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@ -1368,7 +1368,7 @@ fb_open(struct inode *inode, struct file *file)
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fb_deferred_io_open(info, inode, file);
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#endif
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out:
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unlock_kernel();
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mutex_unlock(&info->lock);
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return res;
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}
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@ -1377,11 +1377,11 @@ fb_release(struct inode *inode, struct file *file)
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{
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struct fb_info * const info = file->private_data;
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lock_kernel();
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mutex_lock(&info->lock);
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if (info->fbops->fb_release)
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info->fbops->fb_release(info,1);
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module_put(info->fbops->owner);
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unlock_kernel();
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mutex_unlock(&info->lock);
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return 0;
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}
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@ -1460,6 +1460,7 @@ register_framebuffer(struct fb_info *fb_info)
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if (!registered_fb[i])
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break;
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fb_info->node = i;
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mutex_init(&fb_info->lock);
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fb_info->dev = device_create(fb_class, fb_info->device,
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MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
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@ -808,6 +808,7 @@ struct fb_tile_ops {
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struct fb_info {
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int node;
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int flags;
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struct mutex lock; /* Lock for open/release/ioctl funcs */
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struct fb_var_screeninfo var; /* Current var */
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struct fb_fix_screeninfo fix; /* Current fix */
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struct fb_monspecs monspecs; /* Current Monitor specs */
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