Re: [PATCH v2] clocking-wizard: fix a schedule during spin lock acquisition

["gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>]

On Sat, Sep 24, 2022 at 02:07:14PM +0800, Hao Peng wrote:
> From: Peng Hao <flyingpeng@tencent.com>
> 
> when the interrupt is disabled and the spin lock is acquired,
> calling read_poll_timeout will trigger the schedule, which should
> be replaced by read_poll_timeout_atomic.
> 
> Signed-off-by: Peng Hao <flyingpeng@tencent.com>
> ---
>  .../staging/clocking-wizard/clk-xlnx-clock-wizard.c  | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> b/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> index 39367712ef54..e36a97a57f2a 100644
> --- a/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> +++ b/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> @@ -157,9 +157,9 @@ static int clk_wzrd_dynamic_reconfig(struct clk_hw
> *hw, unsigned long rate,
>         writel(0x00, div_addr + WZRD_DR_DIV_TO_PHASE_OFFSET);
> 
>         /* Check status register */
> -       err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET,
> -                                value, value & WZRD_DR_LOCK_BIT_MASK,
> -                                WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
> +       err = readl_poll_timeout_atomic(divider->base +
> WZRD_DR_STATUS_REG_OFFSET,
> +                                       value, value & WZRD_DR_LOCK_BIT_MASK,
> +                                       WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
>         if (err)
>                 goto err_reconfig;
> 
> @@ -168,9 +168,9 @@ static int clk_wzrd_dynamic_reconfig(struct clk_hw
> *hw, unsigned long rate,
>                divider->base + WZRD_DR_INIT_REG_OFFSET);
> 
>         /* Check status register */
> -       err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET,
> -                                value, value & WZRD_DR_LOCK_BIT_MASK,
> -                                WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
> +       err = readl_poll_timeout_atomic(divider->base +
> WZRD_DR_STATUS_REG_OFFSET,
> +                                       value, value & WZRD_DR_LOCK_BIT_MASK,
> +                                       WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
>  err_reconfig:
>         if (divider->lock)
>                 spin_unlock_irqrestore(divider->lock, flags);
> --
> 2.27.0
> 

Hi,

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