framebuffer compat_ioctl deadlock
Fix deadlock in fb_compat_ioctl. fb_compat_ioctl acquires a mutex and calls fb_ioctl that tries to acquire that mutex too. A regression added during BKL removal. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1262,8 +1262,8 @@ fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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case FBIOPUT_CON2FBMAP:
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arg = (unsigned long) compat_ptr(arg);
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case FBIOBLANK:
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ret = fb_ioctl(file, cmd, arg);
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break;
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mutex_unlock(&info->lock);
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return fb_ioctl(file, cmd, arg);
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case FBIOGET_FSCREENINFO:
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ret = fb_get_fscreeninfo(inode, file, cmd, arg);
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