On Thu, Jan 10, 2008 at 11:44:20AM +0530, Nikanth Karthikesan wrote:
> -static int pt_ioctl(struct inode *inode, struct file *file,
> - unsigned int cmd, unsigned long arg)
> +static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long
> arg)
this looks line-wrapper by your mailer.
> - if (copy_from_user(&mtop, p, sizeof(struct mtop)))
> + if (copy_from_user(&mtop, p, sizeof(struct mtop))) {
> + unlock_kernel();
> return -EFAULT;
> + }
>
> switch (mtop.mt_op) {
>
> case MTREW:
> pt_rewind(tape);
> + unlock_kernel();
It's generally considered good style to only have as few as possible
return values. And this is especially important when returning from
a section that's under a lock. So in this case it would be much better
if you changes this function to have a local 'int error' variable
and then just do
error = -EFOO;
goto out_unlock;
wherever you have an early return with the end of the function looking
like
out_unlock:
unlock_kernel();
return error;
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