linux-kernel - Re: [PATCH] ath5k: Don't fiddle with MSI on suspend/resume.

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Date:	Thu, 7 Aug 2008 21:01:11 +0300
From:	"Nick Kossifidis" <mickflemm@...il.com>
To:	"Michael Karcher" <kernel@...rcher.dialup.fu-berlin.de>
Cc:	linville@...driver.com, linux-wireless@...r.kernel.org,
	ath5k-devel@...ts.ath5k.org, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, mcgrof@...il.com
Subject: Re: [PATCH] ath5k: Don't fiddle with MSI on suspend/resume.

2008/8/7 Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>:
> Commit 256b152b005e319f985f50f2a910a75ba0def74f has removed msi support,
> but overlooked the suspend/resume code. This patch completes msi removal.
>
> I don't consider this patch copyrightable, and thus put it into the
> public domain. The result is of course a base.c file dual-licensed under
> 3-clause-BSD and GPL.
>
> Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
>
> ---
>  drivers/net/wireless/ath5k/base.c |    8 ++------
>  1 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
> index ebf19bc..d092a23 100644
> --- a/drivers/net/wireless/ath5k/base.c
> +++ b/drivers/net/wireless/ath5k/base.c
> @@ -589,7 +589,6 @@ ath5k_pci_suspend(struct pci_dev *pdev, pm_message_t state)
>        ath5k_stop_hw(sc);
>
>        free_irq(pdev->irq, sc);
> -       pci_disable_msi(pdev);
>        pci_save_state(pdev);
>        pci_disable_device(pdev);
>        pci_set_power_state(pdev, PCI_D3hot);
> @@ -618,12 +617,10 @@ ath5k_pci_resume(struct pci_dev *pdev)
>         */
>        pci_write_config_byte(pdev, 0x41, 0);
>
> -       pci_enable_msi(pdev);
> -
>        err = request_irq(pdev->irq, ath5k_intr, IRQF_SHARED, "ath", sc);
>        if (err) {
>                ATH5K_ERR(sc, "request_irq failed\n");
> -               goto err_msi;
> +               goto err_no_irq;
>        }
>
>        err = ath5k_init(sc);
> @@ -644,8 +641,7 @@ ath5k_pci_resume(struct pci_dev *pdev)
>        return 0;
>  err_irq:
>        free_irq(pdev->irq, sc);
> -err_msi:
> -       pci_disable_msi(pdev);
> +err_no_irq:
>        pci_disable_device(pdev);
>        return err;
>  }
> --
> 1.5.5.4
>
>

> Don't sync
> - coherent mapping (descriptors)
> - before unmap, it's useless
> - (wrongly anyway -- for_cpu) beacon skb, it's just mapped,
>  so by the device yet
>
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> Cc: Nick Kossifidis <mickflemm@...il.com>
> Cc: Luis R. Rodriguez <mcgrof@...il.com>
> ---
>  drivers/net/wireless/ath5k/base.c |   11 -----------
>  1 files changed, 0 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
> index 4874a6f..713ee99 100644
> --- a/drivers/net/wireless/ath5k/base.c
> +++ b/drivers/net/wireless/ath5k/base.c
> @@ -1705,10 +1705,6 @@ ath5k_tasklet_rx(unsigned long data)
>                skb = bf->skb;
>                ds = bf->desc;
>
> -               /* TODO only one segment */
> -               pci_dma_sync_single_for_cpu(sc->pdev, sc->desc_daddr,
> -                               sc->desc_len, PCI_DMA_FROMDEVICE);
> -
>                /*
>                 * last buffer must not be freed to ensure proper hardware
>                 * function. When the hardware finishes also a packet next to
> @@ -1772,8 +1768,6 @@ ath5k_tasklet_rx(unsigned long data)
>                                goto next;
>                }
>  accept:
> -               pci_dma_sync_single_for_cpu(sc->pdev, bf->skbaddr,
> -                               rs.rs_datalen, PCI_DMA_FROMDEVICE);
>                pci_unmap_single(sc->pdev, bf->skbaddr, sc->rxbufsize,
>                                PCI_DMA_FROMDEVICE);
>                bf->skb = NULL;
> @@ -1861,9 +1855,6 @@ ath5k_tx_processq(struct ath5k_softc *sc, struct ath5k_txq *txq)
>        list_for_each_entry_safe(bf, bf0, &txq->q, list) {
>                ds = bf->desc;
>
> -               /* TODO only one segment */
> -               pci_dma_sync_single_for_cpu(sc->pdev, sc->desc_daddr,
> -                               sc->desc_len, PCI_DMA_FROMDEVICE);
>                ret = sc->ah->ah_proc_tx_desc(sc->ah, ds, &ts);
>                if (unlikely(ret == -EINPROGRESS))
>                        break;
> @@ -2036,8 +2027,6 @@ ath5k_beacon_send(struct ath5k_softc *sc)
>                ATH5K_WARN(sc, "beacon queue %u didn't stop?\n", sc->bhalq);
>                /* NB: hw still stops DMA, so proceed */
>        }
> -       pci_dma_sync_single_for_cpu(sc->pdev, bf->skbaddr, bf->skb->len,
> -                       PCI_DMA_TODEVICE);
>
>        ath5k_hw_put_tx_buf(ah, sc->bhalq, bf->daddr);
>        ath5k_hw_tx_start(ah, sc->bhalq);
> --
> 1.5.6.2
>
>

Thanks ;-)

Acked-by: Nick Kossifidis <mickflemm@...il.com>

-- 
GPG ID: 0xD21DB2DB
As you read this post global entropy rises. Have Fun ;-)
Nick
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