ar71xx: fix regression in 74x164 initialization with 4.9

The memcpy of the init data relies on chip->registers to be initialized,
which only happens later in the code. Move this initialization further
down to make it work.
This was breaking PCIe/USB on some MikroTik RouterBoard devices.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch b/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch
index d9cfa888fbc31b0d87fb4a51390ceadcfea1d23a..a3d752e9a4a521822ebf0ab0b41d6025d91a99a0 100644 (file)
--- a/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch
+++ b/target/linux/ar71xx/patches-4.9/451-gpio-74x164-improve-platform-device-support.patch
@@ -25,7 +25,7 @@
        /*
         * bits_per_word cannot be configured in platform data
         */
-@@ -115,17 +123,23 @@ static int gen_74x164_probe(struct spi_d
+@@ -115,12 +123,15 @@ static int gen_74x164_probe(struct spi_d
        if (ret < 0)
                return ret;
  
@@ -47,15 +47,7 @@
  
        chip = devm_kzalloc(&spi->dev, sizeof(*chip) + nregs, GFP_KERNEL);
        if (!chip)
-               return -ENOMEM;
- 
-+      if (pdata && pdata->init_data)
-+              memcpy(chip->buffer, pdata->init_data, chip->registers);
-+      
-       spi_set_drvdata(spi, chip);
- 
-       chip->gpio_chip.label = spi->modalias;
-@@ -133,7 +147,11 @@ static int gen_74x164_probe(struct spi_d
+@@ -133,7 +144,11 @@ static int gen_74x164_probe(struct spi_d
        chip->gpio_chip.get = gen_74x164_get_value;
        chip->gpio_chip.set = gen_74x164_set_value;
        chip->gpio_chip.set_multiple = gen_74x164_set_multiple;
@@ -68,6 +60,16 @@
  
        chip->registers = nregs;
        chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;
+@@ -142,6 +157,9 @@ static int gen_74x164_probe(struct spi_d
+       chip->gpio_chip.parent = &spi->dev;
+       chip->gpio_chip.owner = THIS_MODULE;
+ 
++      if (pdata && pdata->init_data)
++              memcpy(chip->buffer, pdata->init_data, chip->registers);
++
+       mutex_init(&chip->lock);
+ 
+       ret = __gen_74x164_write_config(chip);
 @@ -170,17 +188,19 @@ static int gen_74x164_remove(struct spi_
        return 0;
  }