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Commit 24d8bf1b authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

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: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 8be9df6d

drivers/xen/xen-pciback/pci_stub.c

+4 −0
Original line number Diff line number Diff line
@@ -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 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) 
	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;