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    SubjectRe: [Patch 2/2] powerpc: i2c-isa: add access check to legacy ioports
    when probing i2c-pca-isa writes to legacy ioports, which crashes the kernel
    if there is no device at that port.
    This patch adds a check_legacy_ioport call, so probe failes gracefully
    and thus prevents the oops.

    Signed-off-by: Christian Krafft <>

    Index: linux.git/drivers/i2c/busses/i2c-pca-isa.c
    --- linux.git.orig/drivers/i2c/busses/i2c-pca-isa.c
    +++ linux.git/drivers/i2c/busses/i2c-pca-isa.c
    @@ -125,6 +125,13 @@ static int __devinit pca_isa_probe(struc

    dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);

    +#ifdef CONFIG_PPC_MERGE
    + if (check_legacy_ioport(base)) {
    + dev_err(dev, "I/O address %#08lx is not available\n", base);
    + goto out;
    + }
    if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
    dev_err(dev, "I/O address %#08lx is in use\n", base);
    goto out;

    Mit freundlichen Gruessen,
    kind regards,

    Christian Krafft
    IBM Systems & Technology Group,
    Linux Kernel Development
    IT Specialist

    Vorsitzender des Aufsichtsrats: Martin Jetter
    Geschaeftsfuehrung: Herbert Kircher
    Sitz der Gesellschaft: Boeblingen
    Registriergericht: Amtsgericht Stuttgart, HRB 243294
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      Last update: 2008-02-13 18:41    [W:0.023 / U:0.084 seconds]
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