diff options
| author | Glauber de Oliveira Costa | 2008-01-07 11:05:26 -0200 |
|---|---|---|
| committer | Rusty Russell | 2008-01-30 22:50:07 +1100 |
| commit | 7ea07a1500f05e06ebf0136763c781244f77a2a1 (patch) | |
| tree | 3b0e4f64c87c4d668a49d6f979ed4d5ac0137a4f /drivers/lguest/lguest_user.c | |
| parent | d0953d42c3445a120299fac9ad70e672d77898e9 (diff) | |
lguest: make write() operation smp aware
This patch makes the write() file operation smp aware. Which means, receiving
the vcpu_id value through the offset parameter, and being well aware to which
vcpu we're talking to.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lguest_user.c')
| -rw-r--r-- | drivers/lguest/lguest_user.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index 9f0a44329947..2562082a3ea3 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -227,14 +227,21 @@ static ssize_t write(struct file *file, const char __user *in, struct lguest *lg = file->private_data; const unsigned long __user *input = (const unsigned long __user *)in; unsigned long req; + struct lg_cpu *cpu; + unsigned int cpu_id = *off; if (get_user(req, input) != 0) return -EFAULT; input++; /* If you haven't initialized, you must do that first. */ - if (req != LHREQ_INITIALIZE && !lg) - return -EINVAL; + if (req != LHREQ_INITIALIZE) { + if (!lg || (cpu_id >= lg->nr_cpus)) + return -EINVAL; + cpu = &lg->cpus[cpu_id]; + if (!cpu) + return -EINVAL; + } /* Once the Guest is dead, all you can do is read() why it died. */ if (lg && lg->dead) |