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Date: Thu, 2 Dec 2010 09:15:46 -0700
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Jon Mason <jon.mason@...r.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>, linux-pci@...r.kernel.org,
Jonathan Corbet <corbet@....net>, linux-media@...r.kernel.org,
Andrew Gallatin <gallatin@...i.com>,
Brice Goglin <brice@...i.com>, netdev@...r.kernel.org,
Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
Steve Hodgson <shodgson@...arflare.com>,
Ben Hutchings <bhutchings@...arflare.com>,
Stephen Hemminger <shemminger@...ux-foundation.org>,
Ivo van Doorn <IvDoorn@...il.com>,
Gertjan van Wingerde <gwingerde@...il.com>,
linux-wireless@...r.kernel.org, Brian King <brking@...ibm.com>,
Anil Ravindranath <anil_ravindranath@...-sierra.com>,
linux-scsi@...r.kernel.org, Jaya Kumar <jayakumar.alsa@...il.com>,
boyod.yang@...iconmotion.com.cn
Subject: Re: PCI: make pci_restore_state return void
On Tuesday, November 30, 2010 04:43:26 pm Jon Mason wrote:
> pci_restore_state only ever returns 0, thus there is no benefit in
> having it return any value. Also, a large majority of the callers do
> not check the return code of pci_restore_state. Make the
> pci_restore_state a void return and avoid the overhead.
>
> Signed-off-by: Jon Mason <jon.mason@...r.com>
Looks reasonable to me, but doesn't appear to be a regression fix or
anything urgent that needs to be in .37, so I'll wait and let Jesse
handle this when he returns from vacation. OK?
Bjorn
> ---
> drivers/media/video/cafe_ccic.c | 4 +---
> drivers/net/myri10ge/myri10ge.c | 4 +---
> drivers/net/sfc/falcon.c | 25 +++++--------------------
> drivers/net/skge.c | 4 +---
> drivers/net/sky2.c | 5 +----
> drivers/net/wireless/rt2x00/rt2x00pci.c | 4 ++--
> drivers/pci/pci-driver.c | 3 ++-
> drivers/pci/pci.c | 7 ++-----
> drivers/scsi/ipr.c | 8 +-------
> drivers/scsi/pmcraid.c | 7 +------
> drivers/staging/sm7xx/smtcfb.c | 2 +-
> include/linux/pci.h | 8 +++-----
> sound/pci/cs5535audio/cs5535audio_pm.c | 7 +------
> 13 files changed, 22 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/media/video/cafe_ccic.c b/drivers/media/video/cafe_ccic.c
> index 2934770..3e653f3 100644
> --- a/drivers/media/video/cafe_ccic.c
> +++ b/drivers/media/video/cafe_ccic.c
> @@ -2186,9 +2186,7 @@ static int cafe_pci_resume(struct pci_dev *pdev)
> struct cafe_camera *cam = to_cam(v4l2_dev);
> int ret = 0;
>
> - ret = pci_restore_state(pdev);
> - if (ret)
> - return ret;
> + pci_restore_state(pdev);
> ret = pci_enable_device(pdev);
>
> if (ret) {
> diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
> index 8524cc4..d3c4a37 100644
> --- a/drivers/net/myri10ge/myri10ge.c
> +++ b/drivers/net/myri10ge/myri10ge.c
> @@ -3403,9 +3403,7 @@ static int myri10ge_resume(struct pci_dev *pdev)
> return -EIO;
> }
>
> - status = pci_restore_state(pdev);
> - if (status)
> - return status;
> + pci_restore_state(pdev);
>
> status = pci_enable_device(pdev);
> if (status) {
> diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
> index 267019b..1763b9a 100644
> --- a/drivers/net/sfc/falcon.c
> +++ b/drivers/net/sfc/falcon.c
> @@ -1066,22 +1066,9 @@ static int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
>
> /* Restore PCI configuration if needed */
> if (method == RESET_TYPE_WORLD) {
> - if (efx_nic_is_dual_func(efx)) {
> - rc = pci_restore_state(nic_data->pci_dev2);
> - if (rc) {
> - netif_err(efx, drv, efx->net_dev,
> - "failed to restore PCI config for "
> - "the secondary function\n");
> - goto fail3;
> - }
> - }
> - rc = pci_restore_state(efx->pci_dev);
> - if (rc) {
> - netif_err(efx, drv, efx->net_dev,
> - "failed to restore PCI config for the "
> - "primary function\n");
> - goto fail4;
> - }
> + if (efx_nic_is_dual_func(efx))
> + pci_restore_state(nic_data->pci_dev2);
> + pci_restore_state(efx->pci_dev);
> netif_dbg(efx, drv, efx->net_dev,
> "successfully restored PCI config\n");
> }
> @@ -1092,7 +1079,7 @@ static int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
> rc = -ETIMEDOUT;
> netif_err(efx, hw, efx->net_dev,
> "timed out waiting for hardware reset\n");
> - goto fail5;
> + goto fail3;
> }
> netif_dbg(efx, hw, efx->net_dev, "hardware reset complete\n");
>
> @@ -1100,11 +1087,9 @@ static int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
>
> /* pci_save_state() and pci_restore_state() MUST be called in pairs */
> fail2:
> -fail3:
> pci_restore_state(efx->pci_dev);
> fail1:
> -fail4:
> -fail5:
> +fail3:
> return rc;
> }
>
> diff --git a/drivers/net/skge.c b/drivers/net/skge.c
> index 220e039..61553af 100644
> --- a/drivers/net/skge.c
> +++ b/drivers/net/skge.c
> @@ -4087,9 +4087,7 @@ static int skge_resume(struct pci_dev *pdev)
> if (err)
> goto out;
>
> - err = pci_restore_state(pdev);
> - if (err)
> - goto out;
> + pci_restore_state(pdev);
>
> err = skge_reset(hw);
> if (err)
> diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
> index d657708..be3aee7 100644
> --- a/drivers/net/sky2.c
> +++ b/drivers/net/sky2.c
> @@ -4969,10 +4969,7 @@ static int sky2_resume(struct pci_dev *pdev)
> if (err)
> goto out;
>
> - err = pci_restore_state(pdev);
> - if (err)
> - goto out;
> -
> + pci_restore_state(pdev);
> pci_enable_wake(pdev, PCI_D0, 0);
>
> /* Re-enable all clocks */
> diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.c b/drivers/net/wireless/rt2x00/rt2x00pci.c
> index 868ca19..5e3c46f 100644
> --- a/drivers/net/wireless/rt2x00/rt2x00pci.c
> +++ b/drivers/net/wireless/rt2x00/rt2x00pci.c
> @@ -356,12 +356,12 @@ int rt2x00pci_resume(struct pci_dev *pci_dev)
> struct rt2x00_dev *rt2x00dev = hw->priv;
>
> if (pci_set_power_state(pci_dev, PCI_D0) ||
> - pci_enable_device(pci_dev) ||
> - pci_restore_state(pci_dev)) {
> + pci_enable_device(pci_dev)) {
> ERROR(rt2x00dev, "Failed to resume device.\n");
> return -EIO;
> }
>
> + pci_restore_state(pci_dev);
> return rt2x00lib_resume(rt2x00dev);
> }
> EXPORT_SYMBOL_GPL(rt2x00pci_resume);
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index 8a6f797..80e551e 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -449,7 +449,8 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev)
> return error;
> }
>
> - return pci_restore_state(pci_dev);
> + pci_restore_state(pci_dev);
> + return 0;
> }
>
> static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index e98c810..c711d1b 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -937,14 +937,13 @@ pci_save_state(struct pci_dev *dev)
> * pci_restore_state - Restore the saved state of a PCI device
> * @dev: - PCI device that we're dealing with
> */
> -int
> -pci_restore_state(struct pci_dev *dev)
> +void pci_restore_state(struct pci_dev *dev)
> {
> int i;
> u32 val;
>
> if (!dev->state_saved)
> - return 0;
> + return;
>
> /* PCI Express register must be restored first */
> pci_restore_pcie_state(dev);
> @@ -968,8 +967,6 @@ pci_restore_state(struct pci_dev *dev)
> pci_restore_iov_state(dev);
>
> dev->state_saved = false;
> -
> - return 0;
> }
>
> static int do_pci_enable_device(struct pci_dev *dev, int bars)
> diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
> index fa60d7d..1d7dbe6 100644
> --- a/drivers/scsi/ipr.c
> +++ b/drivers/scsi/ipr.c
> @@ -7485,16 +7485,10 @@ static int ipr_reset_restore_cfg_space(struct ipr_cmnd *ipr_cmd)
> {
> struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
> volatile u32 int_reg;
> - int rc;
>
> ENTER;
> ioa_cfg->pdev->state_saved = true;
> - rc = pci_restore_state(ioa_cfg->pdev);
> -
> - if (rc != PCIBIOS_SUCCESSFUL) {
> - ipr_cmd->s.ioasa.hdr.ioasc = cpu_to_be32(IPR_IOASC_PCI_ACCESS_ERROR);
> - return IPR_RC_JOB_CONTINUE;
> - }
> + pci_restore_state(ioa_cfg->pdev);
>
> if (ipr_set_pcix_cmd_reg(ioa_cfg)) {
> ipr_cmd->s.ioasa.hdr.ioasc = cpu_to_be32(IPR_IOASC_PCI_ACCESS_ERROR);
> diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
> index cf89091..091baf2 100644
> --- a/drivers/scsi/pmcraid.c
> +++ b/drivers/scsi/pmcraid.c
> @@ -2227,12 +2227,7 @@ static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
> /* Once either bist or pci reset is done, restore PCI config
> * space. If this fails, proceed with hard reset again
> */
> - if (pci_restore_state(pinstance->pdev)) {
> - pmcraid_info("config-space error resetting again\n");
> - pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
> - pmcraid_reset_alert(cmd);
> - break;
> - }
> + pci_restore_state(pinstance->pdev);
>
> /* fail all pending commands */
> pmcraid_fail_outstanding_cmds(pinstance);
> diff --git a/drivers/staging/sm7xx/smtcfb.c b/drivers/staging/sm7xx/smtcfb.c
> index 24f47d6..7162dee 100644
> --- a/drivers/staging/sm7xx/smtcfb.c
> +++ b/drivers/staging/sm7xx/smtcfb.c
> @@ -1071,7 +1071,7 @@ static int __maybe_unused smtcfb_resume(struct pci_dev *pdev)
> /* when resuming, restore pci data and fb cursor */
> if (pdev->dev.power.power_state.event != PM_EVENT_FREEZE) {
> retv = pci_set_power_state(pdev, PCI_D0);
> - retv = pci_restore_state(pdev);
> + pci_restore_state(pdev);
> if (pci_enable_device(pdev))
> return -1;
> pci_set_master(pdev);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 7454408..63cbadc 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -806,7 +806,7 @@ size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size);
>
> /* Power management related routines */
> int pci_save_state(struct pci_dev *dev);
> -int pci_restore_state(struct pci_dev *dev);
> +void pci_restore_state(struct pci_dev *dev);
> int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state);
> int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
> pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
> @@ -1168,10 +1168,8 @@ static inline int pci_save_state(struct pci_dev *dev)
> return 0;
> }
>
> -static inline int pci_restore_state(struct pci_dev *dev)
> -{
> - return 0;
> -}
> +static inline void pci_restore_state(struct pci_dev *dev)
> +{ }
>
> static inline int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> {
> diff --git a/sound/pci/cs5535audio/cs5535audio_pm.c b/sound/pci/cs5535audio/cs5535audio_pm.c
> index a3301cc..185b000 100644
> --- a/sound/pci/cs5535audio/cs5535audio_pm.c
> +++ b/sound/pci/cs5535audio/cs5535audio_pm.c
> @@ -90,12 +90,7 @@ int snd_cs5535audio_resume(struct pci_dev *pci)
> int i;
>
> pci_set_power_state(pci, PCI_D0);
> - if (pci_restore_state(pci) < 0) {
> - printk(KERN_ERR "cs5535audio: pci_restore_state failed, "
> - "disabling device\n");
> - snd_card_disconnect(card);
> - return -EIO;
> - }
> + pci_restore_state(pci);
> if (pci_enable_device(pci) < 0) {
> printk(KERN_ERR "cs5535audio: pci_enable_device failed, "
> "disabling device\n");
>
--
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