Re: [PATCH] xhci: Convert xhci_handshake() to use readl_poll_timeout()

[Mathias Nyman]

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