linux-kernel - [PATCH net-next 06/11] net: ipa: validate memory regions at init time

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Message-Id: <20210609223503.2649114-7-elder@linaro.org>
Date:   Wed,  9 Jun 2021 17:34:58 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 06/11] net: ipa: validate memory regions at init time

Move the memory region validation check so it happens earlier when
initializing the driver, at init time rather than config time (i.e.,
before access to hardware is required).

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_mem.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index f245e1a60a44b..b2d149e7c5f0e 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -215,10 +215,6 @@ int ipa_mem_config(struct ipa *ipa)
 	ipa->zero_virt = virt;
 	ipa->zero_size = IPA_MEM_MAX;
 
-	/* Make sure all defined memory regions are valid */
-	if (!ipa_mem_valid(ipa))
-		goto err_dma_free;
-
 	/* For each region, write "canary" values in the space prior to
 	 * the region's base address if indicated.
 	 */
@@ -528,6 +524,10 @@ int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 	ipa->mem_count = mem_data->local_count;
 	ipa->mem = mem_data->local;
 
+	/* Make sure all defined memory regions are valid */
+	if (!ipa_mem_valid(ipa))
+		goto err_unmap;
+
 	ret = ipa_imem_init(ipa, mem_data->imem_addr, mem_data->imem_size);
 	if (ret)
 		goto err_unmap;
-- 
2.27.0