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Date: Fri, 27 May 2022 10:50:11 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, Arnd Bergmann <arnd@...db.de>, Geert Uytterhoeven <geert@...ux-m68k.org>, "Jason A. Donenfeld" <Jason@...c4.com> Subject: [PATCH 5.15 110/145] m68k: use fallback for random_get_entropy() instead of zero From: "Jason A. Donenfeld" <Jason@...c4.com> commit 0f392c95391f2d708b12971a07edaa7973f9eece upstream. In the event that random_get_entropy() can't access a cycle counter or similar, falling back to returning 0 is really not the best we can do. Instead, at least calling random_get_entropy_fallback() would be preferable, because that always needs to return _something_, even falling back to jiffies eventually. It's not as though random_get_entropy_fallback() is super high precision or guaranteed to be entropic, but basically anything that's not zero all the time is better than returning zero all the time. Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Arnd Bergmann <arnd@...db.de> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/m68k/include/asm/timex.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/m68k/include/asm/timex.h +++ b/arch/m68k/include/asm/timex.h @@ -35,7 +35,7 @@ static inline unsigned long random_get_e { if (mach_random_get_entropy) return mach_random_get_entropy(); - return 0; + return random_get_entropy_fallback(); } #define random_get_entropy random_get_entropy
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