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From: Jeff Garzik <>
To: Tejun Heo <>
Cc: Linux IDE mailing list <>,
	LKML <>
Subject: devres and requesting resources
Date: Thu, 28 Feb 2008 19:36:34 -0500	[thread overview]
Message-ID: <> (raw)

Something I just noticed, which I missed during the initial devres review...

The vast majority of my ATA drivers originally called 
pci_request_regions(), to reserve all regions attached to a device.

In converting to pcim_iomap_regions(), we no longer reserve /all/ 
regions, only the ones requested.

This is actually a bug:  it was intentional to call 
pci_request_regions(), because that ensures that no other software will 
use our resources -- even if we are not actively using the resource in 

Or IOW, I wanted to ensure that there would be no device sharing... 
which this devres conversion accidentally enabled.

The simple fix is obviously to replace pci_request_region() call with 
pci_request_regions() in lib/devres.c, but I wonder if that will break 
any existing driver?


             reply	other threads:[~2008-02-29  0:36 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-29  0:36 Jeff Garzik [this message]
2008-02-29 11:26 ` Alan Cox
2008-02-29 12:11   ` Jeff Garzik
2008-02-29 12:28     ` Tejun Heo
2008-02-29 14:01       ` Alan Cox
2008-02-29 14:17         ` Tejun Heo
2008-02-29 19:25           ` Jeff Garzik
2008-02-29 17:04         ` Bartlomiej Zolnierkiewicz
2008-02-29 17:04           ` Alan Cox
2008-02-29 13:55     ` Alan Cox

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