On 2/13/07, Arjan van de Ven <[EMAIL PROTECTED]> wrote:
Hi,while working on the last pieces of the file_ops constantification, DVB is the small village in France that is holding the Romans at bay... but I think I found the final flaw in it now: *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); if (!dvbdev) { mutex_unlock(&dvbdev_register_lock); return -ENOMEM; } memcpy(dvbdev, template, sizeof(struct dvb_device)); dvbdev->type = type; dvbdev->id = id; dvbdev->adapter = adap; dvbdev->priv = priv; dvbdev->fops->owner = adap->module; this is the place in DVB that is writing to a struct file_operations. But as with almost all such cases in the kernel, this one is buggy: While the code nicely copies a template dvbdev, that template only has a pointer to a *shared* fops struct, the copy doesn't help that. So this code is overwriting the fops owner field for ALL active devices, not just the ones the copy of the template is for....
While working on a new device node, i stumbled across a similar issue where attaching the frontend failed due to some sort of memory corruption. This was seen as all the callbacks suddenly just vanished, eventhough it existed in the driver At that point, i figured it could be something due to an error at my side , since the device that i was working was a bit complex and had API changes as well. Thanks for pointing it out. It looks like the issue sounds similar. regards, Manu - 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/
