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s390/sclp: avoid using strncmp with hardcoded length 

"earlyprintk" option documentation does not clearly state which
platform supports which additional values (e.g. ",keep"). Preserve old
option behaviour and reuse str_has_prefix instead of strncmp for prefix
testing.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2019-08-19 17:13:04 +02:00
parent b29cd7c4c4
commit 54fb07d030
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/early_printk.c
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@ -25,7 +25,7 @@ static int __init setup_early_printk(char *buf)
if (early_console)
return 0;
/* Accept only "earlyprintk" and "earlyprintk=sclp" */
if (buf && strncmp(buf, "sclp", 4))
if (buf && !str_has_prefix(buf, "sclp"))
return 0;
if (!sclp.has_linemode && !sclp.has_vt220)
return 0;