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

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Date:   Thu, 7 Feb 2019 10:32:10 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     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()

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.

-Mathias