On Wed, Oct 17, 2007 at 11:30:44AM -0700, Roland Dreier wrote:
> static unsigned long flag;
>
> static int cw_open(struct inode *inode, struct file *filp)
> {
> return 0;
> }
>
> static int cw_close(struct inode *inode, struct file *filp)
> {
> clear_bit(1, &flag);
>
> msleep(1);
>
> if (test_and_set_bit(1, &flag))
> printk(KERN_ERR "Write raced with close?\n");
Of _course_ you can trigger that - just open two files and have write
on one of them while another gets closed.
That is certainly possible, but it has nothing whatsoever with the
race you've described - you have two different objects and method
call on one of them might happen when destructor is called on another.
You have protection against ->release() for a struct file called
while you are in ->write() for _same_ struct file.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]