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xen/pciback: Document when the 'unbind' and 'bind' functions are called. 

And also mention that you cannot do any pci_reset_function,
pci_reset_slot, or such calls. This is because they take the same
lock as SysFS does - and we would end up with a dead-lock if
we call those functions.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2014-04-21 15:43:08 -04:00
parent 8be9df6d4b
commit 24d8bf1b0a
1 changed files with 4 additions and 0 deletions
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4
drivers/xen/xen-pciback/pci_stub.c
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@ -493,6 +493,8 @@ static int pcistub_seize(struct pci_dev *dev)
return err;
}
/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
* other functions that take the sysfs lock. */
static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err = 0;
@ -520,6 +522,8 @@ out:
return err;
}
/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
* other functions that take the sysfs lock. */
static void pcistub_remove(struct pci_dev *dev)
{
struct pcistub_device *psdev, *found_psdev = NULL;