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Message-ID: <20210326212655.GA912670@bjorn-Precision-5520>
Date: Fri, 26 Mar 2021 16:26:55 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
Viresh Kumar <vireshk@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Dan Williams <dan.j.williams@...el.com>,
Vinod Koul <vkoul@...nel.org>,
David Miller <davem@...emloft.net>,
Lee Jones <lee.jones@...aro.org>,
Ion Badulescu <ionut@...ula.org>,
Jakub Kicinski <kuba@...nel.org>,
Lino Sanfilippo <LinoSanfilippo@....de>,
Christian Lamparter <chunkeey@...glemail.com>,
Kalle Valo <kvalo@...eaurora.org>,
Luis Chamberlain <mcgrof@...nel.org>,
Adam Radford <aradford@...il.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
James Smart <james.smart@...adcom.com>,
Dick Kennedy <dick.kennedy@...adcom.com>,
Nilesh Javali <njavali@...vell.com>,
GR-QLogic-Storage-Upstream@...vell.com,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Peter Chen <Peter.Chen@....com>,
Felipe Balbi <balbi@...nel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
linux-doc@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-ide@...r.kernel.org, dmaengine@...r.kernel.org,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
linux-parisc@...r.kernel.org,
linux-wireless <linux-wireless@...r.kernel.org>,
SCSI development list <linux-scsi@...r.kernel.org>,
linux-serial@...r.kernel.org,
Linux USB Mailing List <linux-usb@...r.kernel.org>,
Randy Dunlap <rdunlap@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] PCI: Remove pci_try_set_mwi
[+cc Randy, Andrew (though I'm sure you have zero interest in this
ancient question :))]
On Wed, Dec 09, 2020 at 09:31:21AM +0100, Heiner Kallweit wrote:
> pci_set_mwi() and pci_try_set_mwi() do exactly the same, just that the
> former one is declared as __must_check. However also some callers of
> pci_set_mwi() have a comment that it's an optional feature. I don't
> think there's much sense in this separation and the use of
> __must_check. Therefore remove pci_try_set_mwi() and remove the
> __must_check attribute from pci_set_mwi().
> I don't expect either function to be used in new code anyway.
There's not much I like better than removing things. But some
significant thought went into adding pci_try_set_mwi() in the first
place, so I need a little more convincing about why it's safe to
remove it.
The argument should cite the discussion about adding it. I think one
of the earliest conversations is here:
https://lore.kernel.org/linux-ide/20070404213704.224128ec.randy.dunlap@oracle.com/
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
> patch applies on top of pci/misc for v5.11
> ---
> Documentation/PCI/pci.rst | 5 +----
> drivers/ata/pata_cs5530.c | 2 +-
> drivers/ata/sata_mv.c | 2 +-
> drivers/dma/dw/pci.c | 2 +-
> drivers/dma/hsu/pci.c | 2 +-
> drivers/ide/cs5530.c | 2 +-
> drivers/mfd/intel-lpss-pci.c | 2 +-
> drivers/net/ethernet/adaptec/starfire.c | 2 +-
> drivers/net/ethernet/alacritech/slicoss.c | 2 +-
> drivers/net/ethernet/dec/tulip/tulip_core.c | 5 +----
> drivers/net/ethernet/sun/cassini.c | 4 ++--
> drivers/net/wireless/intersil/p54/p54pci.c | 2 +-
> .../intersil/prism54/islpci_hotplug.c | 3 +--
> .../wireless/realtek/rtl818x/rtl8180/dev.c | 2 +-
> drivers/pci/pci.c | 19 -------------------
> drivers/scsi/3w-9xxx.c | 4 ++--
> drivers/scsi/3w-sas.c | 4 ++--
> drivers/scsi/csiostor/csio_init.c | 2 +-
> drivers/scsi/lpfc/lpfc_init.c | 2 +-
> drivers/scsi/qla2xxx/qla_init.c | 8 ++++----
> drivers/scsi/qla2xxx/qla_mr.c | 2 +-
> drivers/tty/serial/8250/8250_lpss.c | 2 +-
> drivers/usb/chipidea/ci_hdrc_pci.c | 2 +-
> drivers/usb/gadget/udc/amd5536udc_pci.c | 2 +-
> drivers/usb/gadget/udc/net2280.c | 2 +-
> drivers/usb/gadget/udc/pch_udc.c | 2 +-
> include/linux/pci.h | 5 ++---
> 27 files changed, 33 insertions(+), 60 deletions(-)
>
> diff --git a/Documentation/PCI/pci.rst b/Documentation/PCI/pci.rst
> index 814b40f83..120362cc9 100644
> --- a/Documentation/PCI/pci.rst
> +++ b/Documentation/PCI/pci.rst
> @@ -226,10 +226,7 @@ If the PCI device can use the PCI Memory-Write-Invalidate transaction,
> call pci_set_mwi(). This enables the PCI_COMMAND bit for Mem-Wr-Inval
> and also ensures that the cache line size register is set correctly.
> Check the return value of pci_set_mwi() as not all architectures
> -or chip-sets may support Memory-Write-Invalidate. Alternatively,
> -if Mem-Wr-Inval would be nice to have but is not required, call
> -pci_try_set_mwi() to have the system do its best effort at enabling
> -Mem-Wr-Inval.
> +or chip-sets may support Memory-Write-Invalidate.
>
>
> Request MMIO/IOP resources
> diff --git a/drivers/ata/pata_cs5530.c b/drivers/ata/pata_cs5530.c
> index ad75d02b6..8654b3ae1 100644
> --- a/drivers/ata/pata_cs5530.c
> +++ b/drivers/ata/pata_cs5530.c
> @@ -214,7 +214,7 @@ static int cs5530_init_chip(void)
> }
>
> pci_set_master(cs5530_0);
> - pci_try_set_mwi(cs5530_0);
> + pci_set_mwi(cs5530_0);
>
> /*
> * Set PCI CacheLineSize to 16-bytes:
> diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
> index 664ef658a..ee37755ea 100644
> --- a/drivers/ata/sata_mv.c
> +++ b/drivers/ata/sata_mv.c
> @@ -4432,7 +4432,7 @@ static int mv_pci_init_one(struct pci_dev *pdev,
> mv_print_info(host);
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
> return ata_host_activate(host, pdev->irq, mv_interrupt, IRQF_SHARED,
> IS_GEN_I(hpriv) ? &mv5_sht : &mv6_sht);
> }
> diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
> index 1142aa6f8..1c20b7485 100644
> --- a/drivers/dma/dw/pci.c
> +++ b/drivers/dma/dw/pci.c
> @@ -30,7 +30,7 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
> if (ret)
> diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c
> index 07cc7320a..420dd3706 100644
> --- a/drivers/dma/hsu/pci.c
> +++ b/drivers/dma/hsu/pci.c
> @@ -73,7 +73,7 @@ static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
> if (ret)
> diff --git a/drivers/ide/cs5530.c b/drivers/ide/cs5530.c
> index 5bb46e713..5d2c421ab 100644
> --- a/drivers/ide/cs5530.c
> +++ b/drivers/ide/cs5530.c
> @@ -168,7 +168,7 @@ static int init_chipset_cs5530(struct pci_dev *dev)
> */
>
> pci_set_master(cs5530_0);
> - pci_try_set_mwi(cs5530_0);
> + pci_set_mwi(cs5530_0);
>
> /*
> * Set PCI CacheLineSize to 16-bytes:
> diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
> index 2d7c588ef..a0c3be750 100644
> --- a/drivers/mfd/intel-lpss-pci.c
> +++ b/drivers/mfd/intel-lpss-pci.c
> @@ -39,7 +39,7 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev,
>
> /* Probably it is enough to set this for iDMA capable devices only */
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> ret = intel_lpss_probe(&pdev->dev, info);
> if (ret)
> diff --git a/drivers/net/ethernet/adaptec/starfire.c b/drivers/net/ethernet/adaptec/starfire.c
> index 555299737..1dbff34c4 100644
> --- a/drivers/net/ethernet/adaptec/starfire.c
> +++ b/drivers/net/ethernet/adaptec/starfire.c
> @@ -679,7 +679,7 @@ static int starfire_init_one(struct pci_dev *pdev,
> pci_set_master(pdev);
>
> /* enable MWI -- it vastly improves Rx performance on sparc64 */
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> #ifdef ZEROCOPY
> /* Starfire can do TCP/UDP checksumming */
> diff --git a/drivers/net/ethernet/alacritech/slicoss.c b/drivers/net/ethernet/alacritech/slicoss.c
> index 696517eae..544510f57 100644
> --- a/drivers/net/ethernet/alacritech/slicoss.c
> +++ b/drivers/net/ethernet/alacritech/slicoss.c
> @@ -1749,7 +1749,7 @@ static int slic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> slic_configure_pci(pdev);
>
> diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
> index c1dcd6ca1..4f6debb24 100644
> --- a/drivers/net/ethernet/dec/tulip/tulip_core.c
> +++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
> @@ -1193,10 +1193,7 @@ static void tulip_mwi_config(struct pci_dev *pdev, struct net_device *dev)
> /* if we have any cache line size at all, we can do MRM and MWI */
> csr0 |= MRM | MWI;
>
> - /* Enable MWI in the standard PCI command bit.
> - * Check for the case where MWI is desired but not available
> - */
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* read result from hardware (in case bit refused to enable) */
> pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
> diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c
> index 9ff894ba8..9a95ec989 100644
> --- a/drivers/net/ethernet/sun/cassini.c
> +++ b/drivers/net/ethernet/sun/cassini.c
> @@ -4933,14 +4933,14 @@ static int cas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
> pci_cmd &= ~PCI_COMMAND_SERR;
> pci_cmd |= PCI_COMMAND_PARITY;
> pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
> - if (pci_try_set_mwi(pdev))
> + if (pci_set_mwi(pdev))
> pr_warn("Could not enable MWI for %s\n", pci_name(pdev));
>
> cas_program_bridge(pdev);
>
> /*
> * On some architectures, the default cache line size set
> - * by pci_try_set_mwi reduces perforamnce. We have to increase
> + * by pci_set_mwi reduces performance. We have to increase
> * it for this case. To start, we'll print some configuration
> * data.
> */
> diff --git a/drivers/net/wireless/intersil/p54/p54pci.c b/drivers/net/wireless/intersil/p54/p54pci.c
> index e97ee547b..c76326d1e 100644
> --- a/drivers/net/wireless/intersil/p54/p54pci.c
> +++ b/drivers/net/wireless/intersil/p54/p54pci.c
> @@ -583,7 +583,7 @@ static int p54p_probe(struct pci_dev *pdev,
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> pci_write_config_byte(pdev, 0x40, 0);
> pci_write_config_byte(pdev, 0x41, 0);
> diff --git a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
> index 31a1e6132..e8087d9a5 100644
> --- a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
> +++ b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
> @@ -153,8 +153,7 @@ prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> DEBUG(SHOW_TRACING, "%s: pci_set_master(pdev)\n", DRV_NAME);
> pci_set_master(pdev);
>
> - /* enable MWI */
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* setup the network device interface and its structure */
> if (!(ndev = islpci_setup(pdev))) {
> diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> index 2477e18c7..b259b0b58 100644
> --- a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> +++ b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> @@ -1871,7 +1871,7 @@ static int rtl8180_probe(struct pci_dev *pdev,
>
> if (priv->chip_family != RTL818X_CHIP_FAMILY_RTL8180) {
> priv->band.n_bitrates = ARRAY_SIZE(rtl818x_rates);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
> }
>
> if (priv->chip_family != RTL818X_CHIP_FAMILY_RTL8180)
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 9a5500287..f0ab432d2 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4389,25 +4389,6 @@ int pcim_set_mwi(struct pci_dev *dev)
> }
> EXPORT_SYMBOL(pcim_set_mwi);
>
> -/**
> - * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
> - * @dev: the PCI device for which MWI is enabled
> - *
> - * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
> - * Callers are not required to check the return value.
> - *
> - * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
> - */
> -int pci_try_set_mwi(struct pci_dev *dev)
> -{
> -#ifdef PCI_DISABLE_MWI
> - return 0;
> -#else
> - return pci_set_mwi(dev);
> -#endif
> -}
> -EXPORT_SYMBOL(pci_try_set_mwi);
> -
> /**
> * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
> * @dev: the PCI device to disable
> diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
> index b4718a1b2..d869485e2 100644
> --- a/drivers/scsi/3w-9xxx.c
> +++ b/drivers/scsi/3w-9xxx.c
> @@ -2018,7 +2018,7 @@ static int twa_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (retval)
> @@ -2227,7 +2227,7 @@ static int __maybe_unused twa_resume(struct device *dev)
>
> printk(KERN_WARNING "3w-9xxx: Resuming host %d.\n", tw_dev->host->host_no);
>
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (retval)
> diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
> index b8f1848ec..49ca153b8 100644
> --- a/drivers/scsi/3w-sas.c
> +++ b/drivers/scsi/3w-sas.c
> @@ -1571,7 +1571,7 @@ static int twl_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (retval)
> @@ -1790,7 +1790,7 @@ static int __maybe_unused twl_resume(struct device *dev)
> TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
>
> printk(KERN_WARNING "3w-sas: Resuming host %d.\n", tw_dev->host->host_no);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (retval)
> diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
> index 390b07bf9..c20bf44c6 100644
> --- a/drivers/scsi/csiostor/csio_init.c
> +++ b/drivers/scsi/csiostor/csio_init.c
> @@ -201,7 +201,7 @@ csio_pci_init(struct pci_dev *pdev, int *bars)
> goto err_disable_device;
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (rv)
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index ac67f420e..b4833c0f8 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -6119,7 +6119,7 @@ lpfc_enable_pci_dev(struct lpfc_hba *phba)
> goto out_disable_device;
> /* Set up device as PCI master and save state for EEH */
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
> pci_save_state(pdev);
>
> /* PCIe EEH recovery on powerpc platforms needs fundamental reset */
> diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
> index 5626e9b69..76019dc2e 100644
> --- a/drivers/scsi/qla2xxx/qla_init.c
> +++ b/drivers/scsi/qla2xxx/qla_init.c
> @@ -2356,7 +2356,7 @@ qla2100_pci_config(scsi_qla_host_t *vha)
> struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
>
> pci_set_master(ha->pdev);
> - pci_try_set_mwi(ha->pdev);
> + pci_set_mwi(ha->pdev);
>
> pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
> w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> @@ -2388,7 +2388,7 @@ qla2300_pci_config(scsi_qla_host_t *vha)
> struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
>
> pci_set_master(ha->pdev);
> - pci_try_set_mwi(ha->pdev);
> + pci_set_mwi(ha->pdev);
>
> pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
> w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> @@ -2469,7 +2469,7 @@ qla24xx_pci_config(scsi_qla_host_t *vha)
> struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
>
> pci_set_master(ha->pdev);
> - pci_try_set_mwi(ha->pdev);
> + pci_set_mwi(ha->pdev);
>
> pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
> w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> @@ -2511,7 +2511,7 @@ qla25xx_pci_config(scsi_qla_host_t *vha)
> struct qla_hw_data *ha = vha->hw;
>
> pci_set_master(ha->pdev);
> - pci_try_set_mwi(ha->pdev);
> + pci_set_mwi(ha->pdev);
>
> pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
> w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> diff --git a/drivers/scsi/qla2xxx/qla_mr.c b/drivers/scsi/qla2xxx/qla_mr.c
> index ca7306685..e9763d8e3 100644
> --- a/drivers/scsi/qla2xxx/qla_mr.c
> +++ b/drivers/scsi/qla2xxx/qla_mr.c
> @@ -499,7 +499,7 @@ qlafx00_pci_config(scsi_qla_host_t *vha)
> struct qla_hw_data *ha = vha->hw;
>
> pci_set_master(ha->pdev);
> - pci_try_set_mwi(ha->pdev);
> + pci_set_mwi(ha->pdev);
>
> pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
> w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
> index 4dee8a9e0..8acc1e5c9 100644
> --- a/drivers/tty/serial/8250/8250_lpss.c
> +++ b/drivers/tty/serial/8250/8250_lpss.c
> @@ -193,7 +193,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
> if (ret)
> return;
>
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* Special DMA address for UART */
> dma->rx_dma_addr = 0xfffff000;
> diff --git a/drivers/usb/chipidea/ci_hdrc_pci.c b/drivers/usb/chipidea/ci_hdrc_pci.c
> index d63479e1a..d412fa910 100644
> --- a/drivers/usb/chipidea/ci_hdrc_pci.c
> +++ b/drivers/usb/chipidea/ci_hdrc_pci.c
> @@ -78,7 +78,7 @@ static int ci_hdrc_pci_probe(struct pci_dev *pdev,
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* register a nop PHY */
> ci->phy = usb_phy_generic_register();
> diff --git a/drivers/usb/gadget/udc/amd5536udc_pci.c b/drivers/usb/gadget/udc/amd5536udc_pci.c
> index 8d387e0e4..9630ce8d3 100644
> --- a/drivers/usb/gadget/udc/amd5536udc_pci.c
> +++ b/drivers/usb/gadget/udc/amd5536udc_pci.c
> @@ -151,7 +151,7 @@ static int udc_pci_probe(
> dev->chiprev = pdev->revision;
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* init dma pools */
> if (use_dma) {
> diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> index fc9f99fe7..e15520698 100644
> --- a/drivers/usb/gadget/udc/net2280.c
> +++ b/drivers/usb/gadget/udc/net2280.c
> @@ -3761,7 +3761,7 @@ static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> &dev->pci->pcimstctl);
> /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* ... also flushes any posted pci writes */
> dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
> diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
> index a3c1fc924..4a0484a0c 100644
> --- a/drivers/usb/gadget/udc/pch_udc.c
> +++ b/drivers/usb/gadget/udc/pch_udc.c
> @@ -3100,7 +3100,7 @@ static int pch_udc_probe(struct pci_dev *pdev,
> }
>
> pci_set_master(pdev);
> - pci_try_set_mwi(pdev);
> + pci_set_mwi(pdev);
>
> /* device struct setup */
> spin_lock_init(&dev->lock);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index de75f6a4d..c590f616d 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1191,9 +1191,8 @@ void pci_clear_master(struct pci_dev *dev);
>
> int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
> int pci_set_cacheline_size(struct pci_dev *dev);
> -int __must_check pci_set_mwi(struct pci_dev *dev);
> -int __must_check pcim_set_mwi(struct pci_dev *dev);
> -int pci_try_set_mwi(struct pci_dev *dev);
> +int pci_set_mwi(struct pci_dev *dev);
> +int pcim_set_mwi(struct pci_dev *dev);
> void pci_clear_mwi(struct pci_dev *dev);
> void pci_intx(struct pci_dev *dev, int enable);
> bool pci_check_and_mask_intx(struct pci_dev *dev);
> --
> 2.29.2
>
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