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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-04-21 23:43:08 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-05-23 20:33:50 +0400
commit24d8bf1b0a12a92171c6f08a665c6ff3f0788c91 (patch)
treeb33b506798dd763e0c9e14b84c6e90ff2a98f8f7 /drivers/xen
parent8be9df6d4b6b53112abb078cb58827767471d797 (diff)
downloadlinux-24d8bf1b0a12a92171c6f08a665c6ff3f0788c91.tar.xz
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xen-pciback/pci_stub.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index b84426a7f88d..1539becad139 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -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;