3.11.10.9 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit ed26f87b9f71693a1d1ee85f5e6209601505080f upstream.
During probe the driver allocates dummy I2C device for RTC with i2c_new_dummy() but it does not check the return value of this call.
In case of error (i2c_new_device(): memory allocation failure or I2C
address cannot be used) this function returns NULL which is later used
by i2c_unregister_device().
If i2c_new_dummy() fails for RTC device, fail also the probe for
main MFD driver.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/mfd/max8998.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
index 21af51a..7c169e6 100644
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -214,6 +214,10 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
mutex_init(&max8998->iolock);
max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
+ if (!max8998->rtc) {
+ dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
+ return -ENODEV;
+ }
i2c_set_clientdata(max8998->rtc, max8998);
max8998_irq_init(max8998);
--
1.9.1
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