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

Alan Cox napsal(a):

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+	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@gmail.com)
Faculty of Informatics, Masaryk University