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[PATCH 1/2] PCI: pciehp: Queue power work requests in dedicated function

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  [PATCH 1/2] PCI: pciehp: Queue power work requests in dedicated function Guenter Roeck <linux@roeck-us.net> - 2015-10-12 21:20 +0200
    [RFC PATCH] PCI: pciehp: pciehp_queue_power_work() can be static kbuild test robot <lkp@intel.com> - 2015-10-12 23:30 +0200
    Re: [PATCH 1/2] PCI: pciehp: Queue power work requests in dedicated  function kbuild test robot <lkp@intel.com> - 2015-10-12 23:30 +0200

#1245053 — [PATCH 1/2] PCI: pciehp: Queue power work requests in dedicated function

Up to now, work items to be queued to be handled by pciehp_power_thread()
are allocated using kmalloc() in three different locations. If not needed,
kfree() is called to free the allocated data.

Introduce a separate function to allocate the work item and queue it,
and call it only if needed. This reduces code ducplication and avoids
having to free memory if the work item does not need to get executed.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/pci/hotplug/pciehp_ctrl.c | 66 +++++++++++----------------------------
 1 file changed, 19 insertions(+), 47 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index f3796124ad7c..ef96a1d51fac 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -204,11 +204,12 @@ static void pciehp_power_thread(struct work_struct *work)
 	kfree(info);
 }
 
-void pciehp_queue_pushbutton_work(struct work_struct *work)
+void pciehp_queue_power_work(struct slot *p_slot, int req)
 {
-	struct slot *p_slot = container_of(work, struct slot, work.work);
 	struct power_work_info *info;
 
+	p_slot->state = req == ENABLE_REQ ? POWERON_STATE : POWEROFF_STATE;
+
 	info = kmalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
@@ -217,23 +218,25 @@ void pciehp_queue_pushbutton_work(struct work_struct *work)
 	}
 	info->p_slot = p_slot;
 	INIT_WORK(&info->work, pciehp_power_thread);
+	info->req = req;
+	queue_work(p_slot->wq, &info->work);
+}
+
+void pciehp_queue_pushbutton_work(struct work_struct *work)
+{
+	struct slot *p_slot = container_of(work, struct slot, work.work);
 
 	mutex_lock(&p_slot->lock);
 	switch (p_slot->state) {
 	case BLINKINGOFF_STATE:
-		p_slot->state = POWEROFF_STATE;
-		info->req = DISABLE_REQ;
+		pciehp_queue_power_work(p_slot, DISABLE_REQ);
 		break;
 	case BLINKINGON_STATE:
-		p_slot->state = POWERON_STATE;
-		info->req = ENABLE_REQ;
+		pciehp_queue_power_work(p_slot, ENABLE_REQ);
 		break;
 	default:
-		kfree(info);
-		goto out;
+		break;
 	}
-	queue_work(p_slot->wq, &info->work);
- out:
 	mutex_unlock(&p_slot->lock);
 }
 
@@ -301,27 +304,13 @@ static void handle_button_press_event(struct slot *p_slot)
 static void handle_surprise_event(struct slot *p_slot)
 {
 	u8 getstatus;
-	struct power_work_info *info;
-
-	info = kmalloc(sizeof(*info), GFP_KERNEL);
-	if (!info) {
-		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
-			 __func__);
-		return;
-	}
-	info->p_slot = p_slot;
-	INIT_WORK(&info->work, pciehp_power_thread);
 
 	pciehp_get_adapter_status(p_slot, &getstatus);
 	if (!getstatus) {
-		p_slot->state = POWEROFF_STATE;
-		info->req = DISABLE_REQ;
+		pciehp_queue_power_work(p_slot, DISABLE_REQ);
 	} else {
-		p_slot->state = POWERON_STATE;
-		info->req = ENABLE_REQ;
+		pciehp_queue_power_work(p_slot, ENABLE_REQ);
 	}
-
-	queue_work(p_slot->wq, &info->work);
 }
 
 /*
@@ -330,17 +319,6 @@ static void handle_surprise_event(struct slot *p_slot)
 static void handle_link_event(struct slot *p_slot, u32 event)
 {
 	struct controller *ctrl = p_slot->ctrl;
-	struct power_work_info *info;
-
-	info = kmalloc(sizeof(*info), GFP_KERNEL);
-	if (!info) {
-		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
-			 __func__);
-		return;
-	}
-	info->p_slot = p_slot;
-	info->req = event == INT_LINK_UP ? ENABLE_REQ : DISABLE_REQ;
-	INIT_WORK(&info->work, pciehp_power_thread);
 
 	switch (p_slot->state) {
 	case BLINKINGON_STATE:
@@ -348,22 +326,19 @@ static void handle_link_event(struct slot *p_slot, u32 event)
 		cancel_delayed_work(&p_slot->work);
 		/* Fall through */
 	case STATIC_STATE:
-		p_slot->state = event == INT_LINK_UP ?
-		    POWERON_STATE : POWEROFF_STATE;
-		queue_work(p_slot->wq, &info->work);
+		pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
+					ENABLE_REQ : DISABLE_REQ);
 		break;
 	case POWERON_STATE:
 		if (event == INT_LINK_UP) {
 			ctrl_info(ctrl,
 				  "Link Up event ignored on slot(%s): already powering on\n",
 				  slot_name(p_slot));
-			kfree(info);
 		} else {
 			ctrl_info(ctrl,
 				  "Link Down event queued on slot(%s): currently getting powered on\n",
 				  slot_name(p_slot));
-			p_slot->state = POWEROFF_STATE;
-			queue_work(p_slot->wq, &info->work);
+			pciehp_queue_power_work(p_slot, DISABLE_REQ);
 		}
 		break;
 	case POWEROFF_STATE:
@@ -371,19 +346,16 @@ static void handle_link_event(struct slot *p_slot, u32 event)
 			ctrl_info(ctrl,
 				  "Link Up event queued on slot(%s): currently getting powered off\n",
 				  slot_name(p_slot));
-			p_slot->state = POWERON_STATE;
-			queue_work(p_slot->wq, &info->work);
+			pciehp_queue_power_work(p_slot, ENABLE_REQ);
 		} else {
 			ctrl_info(ctrl,
 				  "Link Down event ignored on slot(%s): already powering off\n",
 				  slot_name(p_slot));
-			kfree(info);
 		}
 		break;
 	default:
 		ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
 			 p_slot->state, slot_name(p_slot));
-		kfree(info);
 		break;
 	}
 }
-- 
2.1.4

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#1245149 — [RFC PATCH] PCI: pciehp: pciehp_queue_power_work() can be static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 pciehp_ctrl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index ef96a1d..e27a9e2 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -204,7 +204,7 @@ static void pciehp_power_thread(struct work_struct *work)
 	kfree(info);
 }
 
-void pciehp_queue_power_work(struct slot *p_slot, int req)
+static void pciehp_queue_power_work(struct slot *p_slot, int req)
 {
 	struct power_work_info *info;
 
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#1245159 — Re: [PATCH 1/2] PCI: pciehp: Queue power work requests in dedicated function

Hi Guenter,

[auto build test WARNING on pci/next -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Guenter-Roeck/PCI-pciehp-Queue-power-work-requests-in-dedicated-function/20151013-031144
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/pci/hotplug/pciehp_ctrl.c:207:6: sparse: symbol 'pciehp_queue_power_work' was not declared. Should it be static?

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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