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PCI: pciehp: Make various functions void since they can't fail

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These functions:

  pcie_enable_notification()
  pciehp_power_off_slot()
  pciehp_get_power_status()
  pciehp_get_attention_status()
  pciehp_set_attention_status()
  pciehp_get_latch_status()
  pciehp_get_adapter_status()
  pcie_write_cmd()

now always return success, so this patch makes them void and drops the
error-checking code in their callers.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2013-12-14 13:06:16 -07:00
parent 1a84b99ccb
commit 6dae62020f
5 changed files with 54 additions and 89 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/pci/hotplug/pciehp.h
View File

@ -140,15 +140,15 @@ struct controller *pcie_init(struct pcie_device *dev);
int pcie_init_notification(struct controller *ctrl);
int pciehp_enable_slot(struct slot *p_slot);
int pciehp_disable_slot(struct slot *p_slot);
int pcie_enable_notification(struct controller *ctrl);
void pcie_enable_notification(struct controller *ctrl);
int pciehp_power_on_slot(struct slot *slot);
int pciehp_power_off_slot(struct slot *slot);
int pciehp_get_power_status(struct slot *slot, u8 *status);
int pciehp_get_attention_status(struct slot *slot, u8 *status);
void pciehp_power_off_slot(struct slot *slot);
void pciehp_get_power_status(struct slot *slot, u8 *status);
void pciehp_get_attention_status(struct slot *slot, u8 *status);
int pciehp_set_attention_status(struct slot *slot, u8 status);
int pciehp_get_latch_status(struct slot *slot, u8 *status);
int pciehp_get_adapter_status(struct slot *slot, u8 *status);
void pciehp_set_attention_status(struct slot *slot, u8 status);
void pciehp_get_latch_status(struct slot *slot, u8 *status);
void pciehp_get_adapter_status(struct slot *slot, u8 *status);
int pciehp_query_power_fault(struct slot *slot);
void pciehp_green_led_on(struct slot *slot);
void pciehp_green_led_off(struct slot *slot);

15
drivers/pci/hotplug/pciehp_core.c
View File

@ -160,7 +160,8 @@ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
__func__, slot_name(slot));
return pciehp_set_attention_status(slot, status);
pciehp_set_attention_status(slot, status);
return 0;
}
@ -192,7 +193,8 @@ static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
__func__, slot_name(slot));
return pciehp_get_power_status(slot, value);
pciehp_get_power_status(slot, value);
return 0;
}
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
@ -202,7 +204,8 @@ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
__func__, slot_name(slot));
return pciehp_get_attention_status(slot, value);
pciehp_get_attention_status(slot, value);
return 0;
}
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
@ -212,7 +215,8 @@ static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
__func__, slot_name(slot));
return pciehp_get_latch_status(slot, value);
pciehp_get_latch_status(slot, value);
return 0;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
@ -222,7 +226,8 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
__func__, slot_name(slot));
return pciehp_get_adapter_status(slot, value);
pciehp_get_adapter_status(slot, value);
return 0;
}
static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)

52
drivers/pci/hotplug/pciehp_ctrl.c
View File

@ -158,11 +158,8 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
{
/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
if (POWER_CTRL(ctrl)) {
if (pciehp_power_off_slot(pslot)) {
ctrl_err(ctrl,
"Issue of Slot Power Off command failed\n");
return;
}
pciehp_power_off_slot(pslot);
/*
* After turning power off, we must wait for at least 1 second
* before taking any action that relies on power having been
@ -174,13 +171,8 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
if (PWR_LED(ctrl))
pciehp_green_led_off(pslot);
if (ATTN_LED(ctrl)) {
if (pciehp_set_attention_status(pslot, 1)) {
ctrl_err(ctrl,
"Issue of Set Attention Led command failed\n");
return;
}
}
if (ATTN_LED(ctrl))
pciehp_set_attention_status(pslot, 1);
}
/**
@ -243,7 +235,7 @@ err_exit:
*/
static int remove_board(struct slot *p_slot)
{
int retval = 0;
int retval;
struct controller *ctrl = p_slot->ctrl;
retval = pciehp_unconfigure_device(p_slot);
@ -251,13 +243,8 @@ static int remove_board(struct slot *p_slot)
return retval;
if (POWER_CTRL(ctrl)) {
/* power off slot */
retval = pciehp_power_off_slot(p_slot);
if (retval) {
ctrl_err(ctrl,
"Issue of Slot Disable command failed\n");
return retval;
}
pciehp_power_off_slot(p_slot);
/*
* After turning power off, we must wait for at least 1 second
* before taking any action that relies on power having been
@ -482,14 +469,14 @@ int pciehp_enable_slot(struct slot *p_slot)
int rc;
struct controller *ctrl = p_slot->ctrl;
rc = pciehp_get_adapter_status(p_slot, &getstatus);
if (rc || !getstatus) {
pciehp_get_adapter_status(p_slot, &getstatus);
if (!getstatus) {
ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
return -ENODEV;
}
if (MRL_SENS(p_slot->ctrl)) {
rc = pciehp_get_latch_status(p_slot, &getstatus);
if (rc || getstatus) {
pciehp_get_latch_status(p_slot, &getstatus);
if (getstatus) {
ctrl_info(ctrl, "Latch open on slot(%s)\n",
slot_name(p_slot));
return -ENODEV;
@ -497,8 +484,8 @@ int pciehp_enable_slot(struct slot *p_slot)
}
if (POWER_CTRL(p_slot->ctrl)) {
rc = pciehp_get_power_status(p_slot, &getstatus);
if (rc || getstatus) {
pciehp_get_power_status(p_slot, &getstatus);
if (getstatus) {
ctrl_info(ctrl, "Already enabled on slot(%s)\n",
slot_name(p_slot));
return -EINVAL;
@ -518,15 +505,14 @@ int pciehp_enable_slot(struct slot *p_slot)
int pciehp_disable_slot(struct slot *p_slot)
{
u8 getstatus = 0;
int ret = 0;
struct controller *ctrl = p_slot->ctrl;
if (!p_slot->ctrl)
return 1;
if (!HP_SUPR_RM(p_slot->ctrl)) {
ret = pciehp_get_adapter_status(p_slot, &getstatus);
if (ret || !getstatus) {
pciehp_get_adapter_status(p_slot, &getstatus);
if (!getstatus) {
ctrl_info(ctrl, "No adapter on slot(%s)\n",
slot_name(p_slot));
return -ENODEV;
@ -534,8 +520,8 @@ int pciehp_disable_slot(struct slot *p_slot)
}
if (MRL_SENS(p_slot->ctrl)) {
ret = pciehp_get_latch_status(p_slot, &getstatus);
if (ret || getstatus) {
pciehp_get_latch_status(p_slot, &getstatus);
if (getstatus) {
ctrl_info(ctrl, "Latch open on slot(%s)\n",
slot_name(p_slot));
return -ENODEV;
@ -543,8 +529,8 @@ int pciehp_disable_slot(struct slot *p_slot)
}
if (POWER_CTRL(p_slot->ctrl)) {
ret = pciehp_get_power_status(p_slot, &getstatus);
if (ret || !getstatus) {
pciehp_get_power_status(p_slot, &getstatus);
if (!getstatus) {
ctrl_info(ctrl, "Already disabled on slot(%s)\n",
slot_name(p_slot));
return -EINVAL;

56
drivers/pci/hotplug/pciehp_hpc.c
View File

@ -153,7 +153,7 @@ static void pcie_wait_cmd(struct controller *ctrl, int poll)
* @cmd: command value written to slot control register
* @mask: bitmask of slot control register to be modified
*/
static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
{
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_status;
@ -208,7 +208,6 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
pcie_wait_cmd(ctrl, poll);
}
mutex_unlock(&ctrl->ctrl_lock);
return 0;
}
static bool check_link_active(struct controller *ctrl)
@ -342,7 +341,7 @@ static int pciehp_link_disable(struct controller *ctrl)
return __pciehp_link_set(ctrl, false);
}
int pciehp_get_attention_status(struct slot *slot, u8 *status)
void pciehp_get_attention_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
struct pci_dev *pdev = ctrl_dev(ctrl);
@ -372,11 +371,9 @@ int pciehp_get_attention_status(struct slot *slot, u8 *status)
*status = 0xFF;
break;
}
return 0;
}
int pciehp_get_power_status(struct slot *slot, u8 *status)
void pciehp_get_power_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
struct pci_dev *pdev = ctrl_dev(ctrl);
@ -400,28 +397,24 @@ int pciehp_get_power_status(struct slot *slot, u8 *status)
*status = 0xFF;
break;
}
return 0;
}
int pciehp_get_latch_status(struct slot *slot, u8 *status)
void pciehp_get_latch_status(struct slot *slot, u8 *status)
{
struct pci_dev *pdev = ctrl_dev(slot->ctrl);
u16 slot_status;
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
*status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
return 0;
}
int pciehp_get_adapter_status(struct slot *slot, u8 *status)
void pciehp_get_adapter_status(struct slot *slot, u8 *status)
{
struct pci_dev *pdev = ctrl_dev(slot->ctrl);
u16 slot_status;
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
*status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
return 0;
}
int pciehp_query_power_fault(struct slot *slot)
@ -433,7 +426,7 @@ int pciehp_query_power_fault(struct slot *slot)
return !!(slot_status & PCI_EXP_SLTSTA_PFD);
}
int pciehp_set_attention_status(struct slot *slot, u8 value)
void pciehp_set_attention_status(struct slot *slot, u8 value)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
@ -451,11 +444,11 @@ int pciehp_set_attention_status(struct slot *slot, u8 value)
slot_cmd = 0x0080;
break;
default:
return -EINVAL;
return;
}
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
return pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
}
void pciehp_green_led_on(struct slot *slot)
@ -515,11 +508,7 @@ int pciehp_power_on_slot(struct slot * slot)
slot_cmd = POWER_ON;
cmd_mask = PCI_EXP_SLTCTL_PCC;
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
return retval;
}
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
@ -530,12 +519,11 @@ int pciehp_power_on_slot(struct slot * slot)
return retval;
}
int pciehp_power_off_slot(struct slot * slot)
void pciehp_power_off_slot(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
int retval;
/* Disable the link at first */
pciehp_link_disable(ctrl);
@ -547,14 +535,9 @@ int pciehp_power_off_slot(struct slot * slot)
slot_cmd = POWER_OFF;
cmd_mask = PCI_EXP_SLTCTL_PCC;
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
ctrl_err(ctrl, "Write command failed!\n");
return retval;
}
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
return 0;
}
static irqreturn_t pcie_isr(int irq, void *dev_id)
@ -617,7 +600,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
int pcie_enable_notification(struct controller *ctrl)
void pcie_enable_notification(struct controller *ctrl)
{
u16 cmd, mask;
@ -643,22 +626,18 @@ int pcie_enable_notification(struct controller *ctrl)
PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
if (pcie_write_cmd(ctrl, cmd, mask)) {
ctrl_err(ctrl, "Cannot enable software notification\n");
return -1;
}
return 0;
pcie_write_cmd(ctrl, cmd, mask);
}
static void pcie_disable_notification(struct controller *ctrl)
{
u16 mask;
mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
PCI_EXP_SLTCTL_DLLSCE);
if (pcie_write_cmd(ctrl, 0, mask))
ctrl_warn(ctrl, "Cannot disable software notification\n");
pcie_write_cmd(ctrl, 0, mask);
}
/*
@ -698,10 +677,7 @@ int pcie_init_notification(struct controller *ctrl)
{
if (pciehp_request_irq(ctrl))
return -1;
if (pcie_enable_notification(ctrl)) {
pciehp_free_irq(ctrl);
return -1;
}
pcie_enable_notification(ctrl);
ctrl->notification_enabled = 1;
return 0;
}

6
drivers/pci/hotplug/pciehp_pci.c
View File

@ -78,7 +78,7 @@ int pciehp_configure_device(struct slot *p_slot)
int pciehp_unconfigure_device(struct slot *p_slot)
{
int ret, rc = 0;
int rc = 0;
u8 bctl = 0;
u8 presence = 0;
struct pci_dev *dev, *temp;
@ -88,9 +88,7 @@ int pciehp_unconfigure_device(struct slot *p_slot)
ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
__func__, pci_domain_nr(parent), parent->number);
ret = pciehp_get_adapter_status(p_slot, &presence);
if (ret)
presence = 0;
pciehp_get_adapter_status(p_slot, &presence);
/*
* Stopping an SR-IOV PF device removes all the associated VFs,