Subject: linux-next: build failure after merge of the mfd tree

From: Stephen Rothwell <[email-masked]>
Date: Fri, 17 Jul 2020 13:41:54 +1000

Hi all,

After merging the mfd tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

drivers/mfd/kempld-core.c: In function 'kempld_register_cells_generic':
drivers/mfd/kempld-core.c:105:13: error: assignment of read-only location 'devs[i++]'
  105 |   devs[i++] = kempld_devs[KEMPLD_I2C];
      |             ^
drivers/mfd/kempld-core.c:108:13: error: assignment of read-only location 'devs[i++]'
  108 |   devs[i++] = kempld_devs[KEMPLD_WDT];
      |             ^
drivers/mfd/kempld-core.c:111:13: error: assignment of read-only location 'devs[i++]'
  111 |   devs[i++] = kempld_devs[KEMPLD_GPIO];
      |             ^
drivers/mfd/kempld-core.c:114:13: error: assignment of read-only location 'devs[i++]'
  114 |   devs[i++] = kempld_devs[KEMPLD_UART];
      |             ^

Caused by commit

  70d48975c152 ("mfd: core: Make a best effort attempt to match devices with the correct of_nodes")

I have added the following fix patch for today (I assume that there is
a better solution):

From: Stephen Rothwell <[email-masked]>
Date: Fri, 17 Jul 2020 13:36:22 +1000
Subject: [PATCH] fix up for struct mfd_cell change

Fixes: 70d48975c152 ("mfd: core: Make a best effort attempt to match devices with the correct of_nodes")
Signed-off-by: Stephen Rothwell <[email-masked]>
---
 drivers/mfd/kempld-core.c | 28 ++++++++++------------------
 1 file changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/mfd/kempld-core.c b/drivers/mfd/kempld-core.c
index f48e21d8b97c..ad68ee699cb5 100644
--- a/drivers/mfd/kempld-core.c
+++ b/drivers/mfd/kempld-core.c
@@ -79,39 +79,31 @@ enum kempld_cells {
 	KEMPLD_UART,
 };
 
-static const struct mfd_cell kempld_devs[] = {
-	[KEMPLD_I2C] = {
-		.name = "kempld-i2c",
-	},
-	[KEMPLD_WDT] = {
-		.name = "kempld-wdt",
-	},
-	[KEMPLD_GPIO] = {
-		.name = "kempld-gpio",
-	},
-	[KEMPLD_UART] = {
-		.name = "kempld-uart",
-	},
+static const char *kempld_devs[] = {
+	[KEMPLD_I2C] = "kempld-i2c",
+	[KEMPLD_WDT] = "kempld-wdt",
+	[KEMPLD_GPIO] = "kempld-gpio",
+	[KEMPLD_UART] = "kempld-uart",
 };
 
 #define KEMPLD_MAX_DEVS	ARRAY_SIZE(kempld_devs)
 
 static int kempld_register_cells_generic(struct kempld_device_data *pld)
 {
-	struct mfd_cell devs[KEMPLD_MAX_DEVS];
+	struct mfd_cell devs[KEMPLD_MAX_DEVS] = {};
 	int i = 0;
 
 	if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
-		devs[i++] = kempld_devs[KEMPLD_I2C];
+		devs[i++].name = kempld_devs[KEMPLD_I2C];
 
 	if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
-		devs[i++] = kempld_devs[KEMPLD_WDT];
+		devs[i++].name = kempld_devs[KEMPLD_WDT];
 
 	if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
-		devs[i++] = kempld_devs[KEMPLD_GPIO];
+		devs[i++].name = kempld_devs[KEMPLD_GPIO];
 
 	if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
-		devs[i++] = kempld_devs[KEMPLD_UART];
+		devs[i++].name = kempld_devs[KEMPLD_UART];
 
 	return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL);
 }
-- 
2.27.0

-- 
Cheers,
Stephen Rothwell