s390/ipl: Fix FCP WWPN and LUN format strings for read
authorMichael Holzheu <holzheu@linux.vnet.ibm.com>
Fri, 21 Jun 2013 11:21:30 +0000 (13:21 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Mon, 24 Jun 2013 09:16:34 +0000 (11:16 +0200)
commiteda4ddf7e3a2245888e8c45c566fd514cdd5abbb
tree2696b557069247b9a3d4761bfbcff48383fa6723
parent35b03aec919c952e67b0b093638e0d79b468f9bc
s390/ipl: Fix FCP WWPN and LUN format strings for read

The following git commit changed the behavior of sscanf:

commit 53809751ac230a3611b5cdd375f3389f3207d471
Author: Jan Beulich <JBeulich@suse.com>
Date:   Mon Dec 17 16:01:31 2012 -0800
    sscanf: don't ignore field widths for numeric conversions

This broke the WWPN and LUN sysfs attributes for s390 reipl and dump
on panic.

Example:

$ echo 0x0123456701234567 > /sys/firmware/reipl/fcp/wwpn
$ cat /sys/firmware/reipl/fcp/wwpn
0x0001234567012345

So fix this and use format strings that work also with the
new sscanf implementation:

$ echo 0x012345670123456789 > /sys/firmware/reipl/fcp/wwpn
$ cat /sys/firmware/reipl/fcp/wwpn
0x0123456701234567

Cc: stable@vger.kernel.org # 3.8+
Reviewed-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/kernel/ipl.c