linux-kernel - readXs on pci*iomap-ped regions [Was: [PATCH] /drivers/char sx.c ioremap -> pci

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Message-ID: <46CFEC40.7060006@gmail.com>
Date:	Sat, 25 Aug 2007 10:45:52 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>,
	linux-ide@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	Jeff Garzik <jgarzik@...ox.com>
Subject: readXs on pci*iomap-ped regions [Was: [PATCH] /drivers/char sx.c
 ioremap -> pci_ioremap api]

Alan Cox napsal(a):
>>>>> +	rebase = pci_iomap(pdev, 0, 0x80);
>>>>>   	t = readl(rebase + CNTRL_REG_OFFSET);
>>> Switch to ioread* if you are using the iomap interface. Its not a trivial
>> Why, if you know it's surely a mem region (and thus you rely on it and do
>> ioremap)? There are many places in the kernel, where this approach is used, e.g.
>> libata piix.
> 
> Every single one of them is wrong. The encoding of iomap values is
> platform dependant. Fixed in my tree.

OK, fast search found these suspicious (not considering e.g. arch/):
$ find drivers/ -name '*.c' -exec grep -q pci.*iomap {} \; -a -exec grep -l
'\<readl\>' {} \+
drivers/firewire/fw-ohci.c
drivers/scsi/sym53c8xx_2/sym_glue.c
drivers/media/dvb/pluto2/pluto2.c
drivers/media/dvb/b2c2/flexcop-pci.c
drivers/ssb/scan.c
drivers/char/cyclades.c
drivers/char/sx.c
drivers/ata/ata_piix.c
drivers/ata/sata_inic162x.c
drivers/ata/pata_pdc2027x.c
drivers/ata/sata_sx4.c
drivers/ata/sata_qstor.c
drivers/ata/sata_mv.c
drivers/ata/sata_svw.c
drivers/ata/sata_nv.c
drivers/ata/sata_sil.c
drivers/ata/sata_vsc.c
drivers/ata/sata_promise.c
drivers/ata/ahci.c
drivers/ata/sata_sil24.c
drivers/net/cassini.c
drivers/mtd/nand/cafe_nand.c

How do you imagine a proper fix?
- move to ioreadX/iowriteX
or
- move back to ioremap (unlikely for the most)
or?

thanks,
-- 
Jiri Slaby (jirislaby@...il.com)
Faculty of Informatics, Masaryk University
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