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

Stephen Rothwell
2020-07-17T03:41:58Z

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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 <sfr@canb.auug.org.au>
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 <sfr@canb.auug.org.au>
---
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

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