linux-kernel - Re: [PATCH] mmc: dw_mmc: replace spin_lock_irqsave by spin

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Message-ID: <CAPDyKFpX9T6aKUmnVNLoo5+CW7h7HHGixT0wefDpV3CMyOJKTQ@mail.gmail.com>
Date:   Tue, 10 Nov 2020 13:26:04 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     Jaehoon Chung <jh80.chung@...sung.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: dw_mmc: replace spin_lock_irqsave by spin_lock in
 hard IRQ

On Fri, 6 Nov 2020 at 02:56, Tian Tao <tiantao6@...ilicon.com> wrote:
>
> The code has been in a irq-disabled context since it is hard IRQ. There
> is no necessity to do it again.
>
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/dw_mmc.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 43c5795..a524443 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2617,7 +2617,6 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>         struct dw_mci *host = dev_id;
>         u32 pending;
>         struct dw_mci_slot *slot = host->slot;
> -       unsigned long irqflags;
>
>         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
>
> @@ -2632,15 +2631,15 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>                          * Hold the lock; we know cmd11_timer can't be kicked
>                          * off after the lock is released, so safe to delete.
>                          */
> -                       spin_lock_irqsave(&host->irq_lock, irqflags);
> +                       spin_lock(&host->irq_lock);
>                         dw_mci_cmd_interrupt(host, pending);
> -                       spin_unlock_irqrestore(&host->irq_lock, irqflags);
> +                       spin_unlock(&host->irq_lock);
>
>                         del_timer(&host->cmd11_timer);
>                 }
>
>                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
> -                       spin_lock_irqsave(&host->irq_lock, irqflags);
> +                       spin_lock(&host->irq_lock);
>
>                         del_timer(&host->cto_timer);
>                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
> @@ -2648,7 +2647,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>                         smp_wmb(); /* drain writebuffer */
>                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
>
> -                       spin_unlock_irqrestore(&host->irq_lock, irqflags);
> +                       spin_unlock(&host->irq_lock);
>                 }
>
>                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
> @@ -2661,7 +2660,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>                 }
>
>                 if (pending & SDMMC_INT_DATA_OVER) {
> -                       spin_lock_irqsave(&host->irq_lock, irqflags);
> +                       spin_lock(&host->irq_lock);
>
>                         del_timer(&host->dto_timer);
>
> @@ -2676,7 +2675,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
>                         tasklet_schedule(&host->tasklet);
>
> -                       spin_unlock_irqrestore(&host->irq_lock, irqflags);
> +                       spin_unlock(&host->irq_lock);
>                 }
>
>                 if (pending & SDMMC_INT_RXDR) {
> @@ -2692,12 +2691,12 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>                 }
>
>                 if (pending & SDMMC_INT_CMD_DONE) {
> -                       spin_lock_irqsave(&host->irq_lock, irqflags);
> +                       spin_lock(&host->irq_lock);
>
>                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
>                         dw_mci_cmd_interrupt(host, pending);
>
> -                       spin_unlock_irqrestore(&host->irq_lock, irqflags);
> +                       spin_unlock(&host->irq_lock);
>                 }
>
>                 if (pending & SDMMC_INT_CD) {
> --
> 2.7.4
>