Date: Wed, 08 Nov 2006 09:59:57 -0700 (MST) From: Warner Losh <imp@bsdimp.com> To: jackie7691@yahoo.com.mx Cc: freebsd-drivers@freebsd.org Subject: Re: PCCARD - interruptible sleep Message-ID: <20061108.095957.41708696.imp@bsdimp.com> In-Reply-To: <20061108103429.24496.qmail@web56014.mail.re3.yahoo.com> References: <20061108103429.24496.qmail@web56014.mail.re3.yahoo.com>
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From: Jacqueline P <jackie7691@yahoo.com.mx>
Subject: PCCARD - interruptible sleep
Date: Wed, 8 Nov 2006 04:34:29 -0600 (CST)
> Hi all
>
> how can I implement an interruptible sleep within my pccard smart card reader driver like ?
> For Linux I do this the following way
>
> // interruptible_pause()
> static inline void ipause(unsigned long amount) {
> set_current_state(TASK_INTERRUPTIBLE);
> schedule_timeout(amount);
> }
>
> and within my driver I use the function DELAY which does a busy wait.
Use msleep instead to do the busy waiting, or limit the amount you
spin.
Alternatively, you can do these things in a task.
> The problem is, that the driver does not recognize when the pccard is detached during a read / write operation.
>
> Does the kernel update the struct device_t, so that the driver can use the function device_is_attached() to determine that the device is detached ?
No, because the device is still attached, even if the hardware is
gone. However, you can ask "bus_child_present(your_devt)" and the
bridge will determine if the hardware is still there.
Warner
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