netdev - igb_down from bottom half context

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Message-ID: <CAGZFCEHrzDDtO8HGaUhuUb_vNddKyiXPzasnkvTqLOqS9SwaDw@mail.gmail.com>
Date:	Wed, 6 Mar 2013 09:38:03 +0530
From:	ratheesh kannoth <ratheesh.ksz@...il.com>
To:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-newbie <linux-newbie@...r.kernel.org>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: igb_down from bottom half context

I  have kernel timer which  check for flag.

if(flag ) {
          igb_down(adapter);
 } else {
         igb_up(adapter);
 }

I could see a kernel crash; because  there are a lot of  msleep() in
igb_down function.

#define msleep(x)    do { set_current_state(TASK_UNINTERRUPTIBLE); \
                                schedule_timeout((x * HZ)/1000 + 2); \
                              } while (0)

sleep() is called from bottom half context; this is the cause of kernel crash.

1) Since timer call back dont have process context associated with it;
i think , "current" points to the last preempted task ?
2) How can i introduce delays in interrupt context to avoid the kernel
crash. mdelay()  will work ?
3) is there any better mechanism to do this job ?

Thanks,
Ratheesh
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