linux-kernel - Why can't we sleep in an ISR?

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Message-ID: <9f1dc2cf0705132337k13aa3ccesc575d4550492a24e@mail.gmail.com>
Date:	Mon, 14 May 2007 12:07:12 +0530
From:	"Learning Linux" <learninglinux4@...il.com>
To:	kernelnewbies@...linux.org, linux-newbie@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Why can't we sleep in an ISR?

I have a very basic doubt here ... what makes it impossible to sleep
in an ISR? I mean, I know that the kernel preemption is disabled and
the kernel will panic, but I could not understand why?

TIA,

LL
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