[PATCH] libata: ata_host_suspend() always returns 0
Sergey Shtylyov
s.shtylyov at omp.ru
Mon Jan 31 11:57:31 PST 2022
ata_host_suspend() always returns 0, so the result checks in the drivers
are pointless. However I chose not to change ata_host_suspend() to *void*
not to have to change
return ata_host_suspend(...);
to
ata_host_suspend(...);
return 0;
Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov at omp.ru>
---
This patch is against the 'for-next' branch of Damien Le Moal's 'libata.git'
repo.
drivers/ata/ata_piix.c | 5 +----
drivers/ata/libata-core.c | 7 +++----
drivers/ata/pata_cs5520.c | 5 +----
drivers/ata/pata_imx.c | 15 ++++++---------
drivers/ata/pata_macio.c | 6 +-----
drivers/ata/pata_triflex.c | 5 +----
drivers/ata/sata_mv.c | 6 +++---
drivers/ata/sata_rcar.c | 18 ++++++++----------
8 files changed, 24 insertions(+), 43 deletions(-)
Index: libata/drivers/ata/ata_piix.c
===================================================================
--- libata.orig/drivers/ata/ata_piix.c
+++ libata/drivers/ata/ata_piix.c
@@ -993,11 +993,8 @@ static int piix_pci_device_suspend(struc
{
struct ata_host *host = pci_get_drvdata(pdev);
unsigned long flags;
- int rc = 0;
- rc = ata_host_suspend(host, mesg);
- if (rc)
- return rc;
+ ata_host_suspend(host, mesg);
/* Some braindamaged ACPI suspend implementations expect the
* controller to be awake on entry; otherwise, it burns cpu
Index: libata/drivers/ata/libata-core.c
===================================================================
--- libata.orig/drivers/ata/libata-core.c
+++ libata/drivers/ata/libata-core.c
@@ -5168,6 +5168,8 @@ EXPORT_SYMBOL_GPL(ata_sas_port_resume);
* @host: host to suspend
* @mesg: PM message
*
+ * Return: always 0
+ *
* Suspend @host. Actual operation is performed by port suspend.
*/
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
@@ -6090,11 +6092,8 @@ EXPORT_SYMBOL_GPL(ata_pci_device_do_resu
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
struct ata_host *host = pci_get_drvdata(pdev);
- int rc = 0;
- rc = ata_host_suspend(host, mesg);
- if (rc)
- return rc;
+ ata_host_suspend(host, mesg);
ata_pci_device_do_suspend(pdev, mesg);
Index: libata/drivers/ata/pata_cs5520.c
===================================================================
--- libata.orig/drivers/ata/pata_cs5520.c
+++ libata/drivers/ata/pata_cs5520.c
@@ -259,11 +259,8 @@ static int cs5520_reinit_one(struct pci_
static int cs5520_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
struct ata_host *host = pci_get_drvdata(pdev);
- int rc = 0;
- rc = ata_host_suspend(host, mesg);
- if (rc)
- return rc;
+ ata_host_suspend(host, mesg);
pci_save_state(pdev);
return 0;
Index: libata/drivers/ata/pata_imx.c
===================================================================
--- libata.orig/drivers/ata/pata_imx.c
+++ libata/drivers/ata/pata_imx.c
@@ -223,17 +223,14 @@ static int pata_imx_suspend(struct devic
{
struct ata_host *host = dev_get_drvdata(dev);
struct pata_imx_priv *priv = host->private_data;
- int ret;
- ret = ata_host_suspend(host, PMSG_SUSPEND);
- if (!ret) {
- __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
- priv->ata_ctl =
- __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
- clk_disable_unprepare(priv->clk);
- }
+ ata_host_suspend(host, PMSG_SUSPEND);
- return ret;
+ __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
+ priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
}
static int pata_imx_resume(struct device *dev)
Index: libata/drivers/ata/pata_macio.c
===================================================================
--- libata.orig/drivers/ata/pata_macio.c
+++ libata/drivers/ata/pata_macio.c
@@ -853,12 +853,8 @@ static int pata_macio_slave_config(struc
#ifdef CONFIG_PM_SLEEP
static int pata_macio_do_suspend(struct pata_macio_priv *priv, pm_message_t mesg)
{
- int rc;
-
/* First, core libata suspend to do most of the work */
- rc = ata_host_suspend(priv->host, mesg);
- if (rc)
- return rc;
+ ata_host_suspend(priv->host, mesg);
/* Restore to default timings */
pata_macio_default_timings(priv);
Index: libata/drivers/ata/pata_triflex.c
===================================================================
--- libata.orig/drivers/ata/pata_triflex.c
+++ libata/drivers/ata/pata_triflex.c
@@ -198,11 +198,8 @@ static const struct pci_device_id trifle
static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
struct ata_host *host = pci_get_drvdata(pdev);
- int rc = 0;
- rc = ata_host_suspend(host, mesg);
- if (rc)
- return rc;
+ ata_host_suspend(host, mesg);
/*
* We must not disable or powerdown the device.
Index: libata/drivers/ata/sata_mv.c
===================================================================
--- libata.orig/drivers/ata/sata_mv.c
+++ libata/drivers/ata/sata_mv.c
@@ -4235,10 +4235,10 @@ static int mv_platform_remove(struct pla
static int mv_platform_suspend(struct platform_device *pdev, pm_message_t state)
{
struct ata_host *host = platform_get_drvdata(pdev);
+
if (host)
- return ata_host_suspend(host, state);
- else
- return 0;
+ ata_host_suspend(host, state);
+ return 0;
}
static int mv_platform_resume(struct platform_device *pdev)
Index: libata/drivers/ata/sata_rcar.c
===================================================================
--- libata.orig/drivers/ata/sata_rcar.c
+++ libata/drivers/ata/sata_rcar.c
@@ -945,19 +945,17 @@ static int sata_rcar_suspend(struct devi
struct ata_host *host = dev_get_drvdata(dev);
struct sata_rcar_priv *priv = host->private_data;
void __iomem *base = priv->base;
- int ret;
- ret = ata_host_suspend(host, PMSG_SUSPEND);
- if (!ret) {
- /* disable interrupts */
- iowrite32(0, base + ATAPI_INT_ENABLE_REG);
- /* mask */
- iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
+ ata_host_suspend(host, PMSG_SUSPEND);
- pm_runtime_put(dev);
- }
+ /* disable interrupts */
+ iowrite32(0, base + ATAPI_INT_ENABLE_REG);
+ /* mask */
+ iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
- return ret;
+ pm_runtime_put(dev);
+
+ return 0;
}
static int sata_rcar_resume(struct device *dev)
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