[F][PATCH 9/11] pci/hotplug/pnv-php: Relax check when disabling slot

[frank.heimes at canonical.com]

From: Frederic Barrat <fbarrat at linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1862121

The driver only allows to disable a slot in the POPULATED
state. However, if an error occurs while enabling the slot, say
because the link couldn't be trained, then the POPULATED state may not
be reached, yet the power state of the slot is on. So allow to disable
a slot in the REGISTERED state. Removing the devices will do nothing
since it's not populated, and we'll set the power state of the slot
back to off.

Reviewed-by: Alastair D'Silva <alastair at d-silva.org>
Reviewed-by: Andrew Donnellan <ajd at linux.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat at linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
Link: https://lore.kernel.org/r/20191121134918.7155-10-fbarrat@linux.ibm.com
(cherry picked from commit be1611e043de63948c21cc7dd27ea6798ffd6fa4)
Signed-off-by: Frank Heimes <frank.heimes at canonical.com>
---
 drivers/pci/hotplug/pnv_php.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index 0cb6a4897905..f2de76390aff 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -566,7 +566,13 @@ static int pnv_php_disable_slot(struct hotplug_slot *slot)
 	struct pnv_php_slot *php_slot = to_pnv_php_slot(slot);
 	int ret;
 
-	if (php_slot->state != PNV_PHP_STATE_POPULATED)
+	/*
+	 * Allow to disable a slot already in the registered state to
+	 * cover cases where the slot couldn't be enabled and never
+	 * reached the populated state
+	 */
+	if (php_slot->state != PNV_PHP_STATE_POPULATED &&
+	    php_slot->state != PNV_PHP_STATE_REGISTERED)
 		return 0;
 
 	/* Remove all devices behind the slot */
-- 
2.25.0