From: Frederic Barrat <fbarrat@linux.ibm.com>
To: Vaibhav Jain <vaibhav@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Dan Carpenter <dan.carpenter@oracle.com>
Cc: Christophe Lombard <christophe_lombard@fr.ibm.com>,
Philippe Bergheaud <philippe.bergheaud@fr.ibm.com>,
"Alastair D'Silva" <alastair@linux.ibm.com>,
stable@vger.kernel.org
Subject: Re: [PATCH] cxl: Fix wrong comparison in cxl_adapter_context_get()
Date: Thu, 5 Jul 2018 09:29:41 +0200 [thread overview]
Message-ID: <241bd81e-23bd-d590-b529-2cad223eeab7@linux.ibm.com> (raw)
In-Reply-To: <20180704152833.2288-1-vaibhav@linux.ibm.com>
Le 04/07/2018 à 17:28, Vaibhav Jain a écrit :
> Function atomic_inc_unless_negative() returns a bool to indicate
> success/failure. However cxl_adapter_context_get() wrongly compares
> the return value against '>=0' which will always be true. The patch
> fixes this comparison to '==0' there by also fixing this compile time
> warning:
>
> drivers/misc/cxl/main.c:290 cxl_adapter_context_get()
> warn: 'atomic_inc_unless_negative(&adapter->contexts_num)' is unsigned
>
> Cc: stable@vger.kernel.org
> Fixes: 70b565bbdb91 ("cxl: Prevent adapter reset if an active context exists")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
> ---
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
> drivers/misc/cxl/main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
> index c1ba0d42cbc8..e0f29b8a872d 100644
> --- a/drivers/misc/cxl/main.c
> +++ b/drivers/misc/cxl/main.c
> @@ -287,7 +287,7 @@ int cxl_adapter_context_get(struct cxl *adapter)
> int rc;
>
> rc = atomic_inc_unless_negative(&adapter->contexts_num);
> - return rc >= 0 ? 0 : -EBUSY;
> + return rc ? 0 : -EBUSY;
> }
>
> void cxl_adapter_context_put(struct cxl *adapter)
>
next prev parent reply other threads:[~2018-07-05 7:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-04 15:28 [PATCH] cxl: Fix wrong comparison in cxl_adapter_context_get() Vaibhav Jain
2018-07-05 1:51 ` Andrew Donnellan
2018-07-05 7:29 ` Frederic Barrat [this message]
2018-07-23 15:11 ` Michael Ellerman
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