ath9k_hw: prevent writes to const data on AR9160

Duplicate the data for iniAddac early on, to avoid having to do redundant
memcpy calls later. While we're at it, make AR5416 < v2.2 use the same
codepath. Fixes a reported crash on x86.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Reported-by: Magnus Määttä <magnus.maatta@logica.com>
Cc: stable@vger.kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9002_hw.c b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
index 11f192a1ceb7..d190411ac8f5 100644
--- a/drivers/net/wireless/ath/ath9k/ar9002_hw.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
@@ -180,6 +180,25 @@ static void ar9002_hw_init_mode_regs(struct ath_hw *ah)
                 INIT_INI_ARRAY(&ah->iniAddac, ar5416Addac,
                                ARRAY_SIZE(ar5416Addac), 2);
         }
+
+        /* iniAddac needs to be modified for these chips */
+        if (AR_SREV_9160(ah) || !AR_SREV_5416_22_OR_LATER(ah)) {
+                struct ar5416IniArray *addac = &ah->iniAddac;
+                u32 size = sizeof(u32) * addac->ia_rows * addac->ia_columns;
+                u32 *data;
+
+                data = kmalloc(size, GFP_KERNEL);
+                if (!data)
+                        return;
+
+                memcpy(data, addac->ia_array, size);
+                addac->ia_array = data;
+
+                if (!AR_SREV_5416_22_OR_LATER(ah)) {
+                        /* override CLKDRV value */
+                        INI_RA(addac, 31,1) = 0;
+                }
+        }
 }
 
 /* Support for Japan ch.14 (2484) spread */