netdev - [PATCH v2 05/15] cxl: fix use of resource

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Message-ID: <20240715172835.24757-6-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:25 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, <richard.hughes@....com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v2 05/15] cxl: fix use of resource_contains

From: Alejandro Lucero <alucerop@....com>

For a resource defined with size zero, resource contains will also
return true.

Add resource size check before using it.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/hdm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 3df10517a327..4af9225d4b59 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -327,10 +327,13 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
 	cxled->dpa_res = res;
 	cxled->skip = skipped;
 
-	if (resource_contains(&cxlds->pmem_res, res))
+	if ((resource_size(&cxlds->pmem_res)) && (resource_contains(&cxlds->pmem_res, res))) {
+		printk("%s: resource_contains CXL_DECODER_PMEM\n", __func__);
 		cxled->mode = CXL_DECODER_PMEM;
-	else if (resource_contains(&cxlds->ram_res, res))
+	} else if ((resource_size(&cxlds->ram_res)) && (resource_contains(&cxlds->ram_res, res))) {
+		printk("%s: resource_contains CXL_DECODER_RAM\n", __func__);
 		cxled->mode = CXL_DECODER_RAM;
+	}
 	else {
 		dev_warn(dev, "decoder%d.%d: %pr mixed mode not supported\n",
 			 port->id, cxled->cxld.id, cxled->dpa_res);
-- 
2.17.1