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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Kalle Valo <kvalo@codeaurora.org>,
        Arnd Bergmann <arnd@arndb.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 119/315] mwifiex: re-fix for unaligned accesses
Date:   Mon, 19 Jul 2021 16:50:08 +0200
Message-Id: <20210719144946.784540123@linuxfoundation.org>
In-Reply-To: <20210719144942.861561397@linuxfoundation.org>
References: <20210719144942.861561397@linuxfoundation.org>
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From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 8f4e3d48bb50765ab27ae5bebed2595b20de80a1 ]

A patch from 2017 changed some accesses to DMA memory to use
get_unaligned_le32() and similar interfaces, to avoid problems
with doing unaligned accesson uncached memory.

However, the change in the mwifiex_pcie_alloc_sleep_cookie_buf()
function ended up changing the size of the access instead,
as it operates on a pointer to u8.

Change this function back to actually access the entire 32 bits.
Note that the pointer is aligned by definition because it came
from dma_alloc_coherent().

Fixes: 92c70a958b0b ("mwifiex: fix for unaligned reads")
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/marvell/mwifiex/pcie.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 7f615ad98aca..5b12d5191acc 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -1070,7 +1070,7 @@ static int mwifiex_pcie_delete_cmdrsp_buf(struct mwifiex_adapter *adapter)
 static int mwifiex_pcie_alloc_sleep_cookie_buf(struct mwifiex_adapter *adapter)
 {
 	struct pcie_service_card *card = adapter->card;
-	u32 tmp;
+	u32 *cookie;
 
 	card->sleep_cookie_vbase = pci_alloc_consistent(card->dev, sizeof(u32),
 						     &card->sleep_cookie_pbase);
@@ -1079,13 +1079,11 @@ static int mwifiex_pcie_alloc_sleep_cookie_buf(struct mwifiex_adapter *adapter)
 			    "pci_alloc_consistent failed!\n");
 		return -ENOMEM;
 	}
+	cookie = (u32 *)card->sleep_cookie_vbase;
 	/* Init val of Sleep Cookie */
-	tmp = FW_AWAKE_COOKIE;
-	put_unaligned(tmp, card->sleep_cookie_vbase);
+	*cookie = FW_AWAKE_COOKIE;
 
-	mwifiex_dbg(adapter, INFO,
-		    "alloc_scook: sleep cookie=0x%x\n",
-		    get_unaligned(card->sleep_cookie_vbase));
+	mwifiex_dbg(adapter, INFO, "alloc_scook: sleep cookie=0x%x\n", *cookie);
 
 	return 0;
 }
-- 
2.30.2