[PATCH] fix kexec load hang in case crash notes addr read failure

[Simon Horman]

On Fri, Sep 25, 2015 at 10:37:51AM +0800, Dave Young wrote:
> While readng crash note, count_cpu variable will be never decreased in case
> any failure to read the sysfs file.
> 
> The issue was found during I test CONFIG_KEXEC_FILE only kernel option.
> crash_notes are exported to sysfs only for CONFIG_KEXEC. In latest kernel
> we can configure kernel with CONFIG_KEXEC_FILE only in Kconfig. In this
> case, if you run a kernel with kexec_file only but do not specify "-s"
> in kexec-tools arguments, then kexec-tools will hang there.
> 
> Though "-s" is mandatory for kexec_file_load, kexec should still fail out
> instead of hanging.
> 
> Fixing the problem by always decreasing count_cpu in the for loop.
> 
> Signed-off-by: Dave Young <dyoung at redhat.com>

Thanks Dave, applied.