From 8f4e3d48bb50765ab27ae5bebed2595b20de80a1 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 8 May 2021 00:07:55 +0200
Subject: [PATCH] mwifiex: re-fix for unaligned accesses
Git-commit: 8f4e3d48bb50765ab27ae5bebed2595b20de80a1
Patch-mainline: v5.14-rc1
References: git-fixes

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/marvell/mwifiex/pcie.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- 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_bu
 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_cook
 			    "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;
 }