[8251] in linux-scsi channel archive
queueing commands and IRQs?
daemon@ATHENA.MIT.EDU (Matthew Dharm)
Fri Feb 25 19:11:55 2000
Date: Fri, 25 Feb 2000 15:22:00 -0800 (PST)
From: Matthew Dharm <mdharm-scsi@one-eyed-alien.net>
To: The Linux SCSI list <linux-scsi@vger.rutgers.edu>
Message-ID: <Pine.LNX.4.10.10002251519560.7808-100000@ziggy.one-eyed-alien.net>
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I think I know the answer to this, but if I'm wrong all sorts of bad will
happen, so I figured I'd bother the experts to make sure. :)
When the SCSI layers calls a host's command queue function, is there any
possibility that the context will be interrupt context? Basically, I need
to know if I need spin_lock() or spin_lock_irqsave(). The non-irq safe
version is "much faster" (according to Linus in spinlock.txt).
Matt Dharm
--
Matthew Dharm Home: mdharm@one-eyed-alien.net
Engineer, Qualcomm, Inc. Work: mdharm@qualcomm.com
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