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powerpc/udbg: Make it safe to call udbg_printf() always 

Make udbg_printf() check if udbg_putc is set, and if not just return.
This makes it safe to call udbg_printf() anytime, even when a udbg
backend has not been registered, which means we can avoid some ifdefs
at call sites.

Signed-off-by: Qian Cai <cai@lca.pw>
[mpe: Split out of larger patch, write change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2019-10-11 19:30:39 +11:00
parent cd1d55f16d
commit f7a678a8fa
1 changed files with 8 additions and 6 deletions
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2
arch/powerpc/kernel/udbg.c
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@ -120,6 +120,7 @@ int udbg_write(const char *s, int n)
#define UDBG_BUFSIZE 256
void udbg_printf(const char *fmt, ...)
{
if (udbg_putc) {
char buf[UDBG_BUFSIZE];
va_list args;
@ -127,6 +128,7 @@ void udbg_printf(const char *fmt, ...)
vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
udbg_puts(buf);
va_end(args);
}
}
void __init udbg_progress(char *s, unsigned short hex)