File Upload gives Bad Request in Django using modelform

I am trying to upload a file using a model form but form.save() is giving me bad request. This is my model:

class cv(models.Model):
    name = models.CharField('Name', max_length=64, null=True)
    path_to_cv = models.FileField('CV', upload_to='/', null=True)

Here is the form:

class Step2(forms.ModelForm):
    class Meta:
    model = cv

Here is the view:

def phdStep2(request):
    if request.method == 'POST':
        form = PhdStep2(request.POST, request.FILES)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect('/step/3/')
    else:
        form = PhdStep2()
    return render(request, 'step2.html', {'form': form})

Here is the template for form:

<form action="/step/2" method="post" class="well form" role="form" enctype="multipart/form-data">
{% csrf_token %}
{% bootstrap_form form %}
{% buttons %}
    <button type="submit" class="btn btn-primary">
        Submit
    </button>
{% endbuttons %}
</form>

Here is the media_root in settings.py:

MEDIA_ROOT = '/home/supertux/PyCharm/myproject/admissions/media'
MEDIA_URL = '/media/'

I have read like 10s of such threads and find that most times problem was enctype in form which i already incorporated. Now as i understand, this should upload the file since its a model form, but i always get a 400 Bad Request. I want to store the name and path to the file in database. What am i doing wrong?