From: Jakob Koschel <jakobkoschel@gmail.com> To: Michael Ellerman <mpe@ellerman.id.au> Cc: Jakob Koschel <jakobkoschel@gmail.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Anton Vorontsov <avorontsov@ru.mvista.com>, Kumar Gala <galak@kernel.crashing.org>, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] powerpc/sysdev: fix incorrect use to determine if list is empty Date: Mon, 28 Feb 2022 15:24:33 +0100 [thread overview] Message-ID: <20220228142434.576226-1-jakobkoschel@gmail.com> (raw) '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 <jakobkoschel@gmail.com> --- 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); } base-commit: 7ee022567bf9e2e0b3cd92461a2f4986ecc99673 -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Jakob Koschel <jakobkoschel@gmail.com> To: Michael Ellerman <mpe@ellerman.id.au> Cc: Kumar Gala <galak@kernel.crashing.org>, linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>, Jakob Koschel <jakobkoschel@gmail.com>, Anton Vorontsov <avorontsov@ru.mvista.com>, linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc/sysdev: fix incorrect use to determine if list is empty Date: Mon, 28 Feb 2022 15:24:33 +0100 [thread overview] Message-ID: <20220228142434.576226-1-jakobkoschel@gmail.com> (raw) '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 <jakobkoschel@gmail.com> --- 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); } base-commit: 7ee022567bf9e2e0b3cd92461a2f4986ecc99673 -- 2.25.1
next reply other threads:[~2022-02-28 14:25 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-02-28 14:24 Jakob Koschel [this message] 2022-02-28 14:24 ` [PATCH] powerpc/sysdev: fix incorrect use to determine if list is empty Jakob Koschel 2022-03-08 12:07 ` Michael Ellerman 2022-03-08 12:07 ` Michael Ellerman
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