linux-kernel - Re: [PATCH] xhci: Convert xhci_handshake() to use readl_poll

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Message-ID: <87sgx0kmvl.fsf@linux.intel.com>
Date:   Thu, 07 Feb 2019 10:45:34 +0200
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-usb@...r.kernel.org
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: Convert xhci_handshake() to use readl_poll_timeout()


Hi,

Mathias Nyman <mathias.nyman@...ux.intel.com> writes:
> On 07.02.2019 02:03, Andrey Smirnov wrote:
>> Xhci_handshake() implements the algorithm already captured by
>> readl_poll_timeout(). Convert the former to use the latter to avoid
>> repetition.
>
> readl_poll_timeout() doesn't really work here as it might sleep.
>
> iopoll.h:
>
> /**
>   * readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
>   *
> ...                                                                                                              
>   * Returns 0 on success and -ETIMEDOUT upon a timeout. In either
>   * case, the last read value at @addr is stored in @val. Must not
>   * be called from atomic context if sleep_us or timeout_us are used.

readl_poll_timeout_atomic()?

-- 
balbi

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