From 32221df6765b3773ff1af37c77f8531ebc48f246 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 9 May 2020 14:06:33 +0200
Subject: [PATCH] ath10k: fix ath10k_pci struct layout
Git-commit: 32221df6765b3773ff1af37c77f8531ebc48f246
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430

gcc-10 correctly points out a bug with a zero-length array in
struct ath10k_pci:

Drivers/net/wireless/ath/ath10k/ahb.c: In function 'ath10k_ahb_remove':
drivers/net/wireless/ath/ath10k/ahb.c:30:9: error: array subscript 0 is outside the bounds of an interior zero-length array 'struct ath10k_ahb[0]' [-Werror=zero-length-bounds]
   30 |  return &((struct ath10k_pci *)ar->drv_priv)->ahb[0];
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/net/wireless/ath/ath10k/ahb.c:13:
drivers/net/wireless/ath/ath10k/pci.h:185:20: note: while referencing 'ahb'
  185 |  struct ath10k_ahb ahb[0];
      |                    ^~~

The last addition to the struct ignored the comments and added
new members behind the array that must remain last.

Change it to a flexible-array member and move it last again to
make it work correctly, prevent the same thing from happening
again (all compilers warn about flexible-array members in the
middle of a struct) and get it to build without warnings.

Fixes: 521fc37be3d8 ("ath10k: Avoid override CE5 configuration for QCA99X0 chipsets")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200509120707.188595-2-arnd@arndb.de
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/ath/ath10k/pci.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index e3cbd259a2dc..862d0901c5b8 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -178,15 +178,16 @@ struct ath10k_pci {
 	 */
 	u32 (*targ_cpu_to_ce_addr)(struct ath10k *ar, u32 addr);
 
+	struct ce_attr *attr;
+	struct ce_pipe_config *pipe_config;
+	struct ce_service_to_pipe *serv_to_pipe;
+
 	/* Keep this entry in the last, memory for struct ath10k_ahb is
 	 * allocated (ahb support enabled case) in the continuation of
 	 * this struct.
 	 */
-	struct ath10k_ahb ahb[0];
+	struct ath10k_ahb ahb[];
 
-	struct ce_attr *attr;
-	struct ce_pipe_config *pipe_config;
-	struct ce_service_to_pipe *serv_to_pipe;
 };
 
 static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)
-- 
2.16.4