From b55697c2a2744b1dddf0e9c86572f12ee9ec736b Mon Sep 17 00:00:00 2001 From: Jakob Koschel Date: Mon, 28 Feb 2022 15:24:33 +0100 Subject: [PATCH] powerpc/sysdev: fix incorrect use to determine if list is empty [ Upstream commit fa1321b11bd01752f5be2415e74a0e1a7c378262 ] 'gtm' will *always* be set by list_for_each_entry(). It is incorrect to assume that the iterator value will be NULL if the list is empty. Instead of checking the pointer it should be checked if the list is empty. Fixes: 83ff9dcf375c ("powerpc/sysdev: implement FSL GTM support") Signed-off-by: Jakob Koschel Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220228142434.576226-1-jakobkoschel@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/sysdev/fsl_gtm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/sysdev/fsl_gtm.c b/arch/powerpc/sysdev/fsl_gtm.c index 8963eaffb1b7..39186ad6b3c3 100644 --- a/arch/powerpc/sysdev/fsl_gtm.c +++ b/arch/powerpc/sysdev/fsl_gtm.c @@ -86,7 +86,7 @@ static LIST_HEAD(gtms); */ struct gtm_timer *gtm_get_timer16(void) { - struct gtm *gtm = NULL; + struct gtm *gtm; int i; list_for_each_entry(gtm, >ms, list_node) { @@ -103,7 +103,7 @@ struct gtm_timer *gtm_get_timer16(void) spin_unlock_irq(>m->lock); } - if (gtm) + if (!list_empty(>ms)) return ERR_PTR(-EBUSY); return ERR_PTR(-ENODEV); }