>
> misc_mtx was used to mutex misc_list.
> But file->f_op->open may be blocked by downloading
> firmware in some devices' open.
> So move file->f_op->open out of mutex (misc_mtx)
> in misc_open to avoid this block.
> It also make code more efficiency.
>
> Signed-off-by: Zhang Dongxing <dongxing.zh...@intel.com>
> Signed-off-by: xiaoming wang <xiaoming.w...@intel.com>
> ---
> drivers/char/misc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/misc.c b/drivers/char/misc.c
> index ffa97d2..289c59e 100644
> --- a/drivers/char/misc.c
> +++ b/drivers/char/misc.c
> @@ -144,7 +144,8 @@ static int misc_open(struct inode * inode, struct file *
> file)
> replace_fops(file, new_fops);
> if (file->f_op->open) {
> file->private_data = c;
> - err = file->f_op->open(inode,file);
> + mutex_unlock(&misc_mtx);
> + return file->f_op->open(inode,file);
> }
What if unregister breaks in while opening?
> fail:
> mutex_unlock(&misc_mtx);
> --
> 1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
