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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);

+ 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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