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authorMichael Auchter <michael.auchter@ni.com>2020-03-10 23:58:40 +0300
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2020-03-12 11:02:34 +0300
commit58d6fee50e67bb1c69977f1a534ccb17bf58b0f1 (patch)
treee0585b9a02d5e3a99208e7c0ff8ef399e111bcd6 /drivers/misc/eeprom
parent2c523b344dfa65a3738e7039832044aa133c75fb (diff)
downloadlinux-58d6fee50e67bb1c69977f1a534ccb17bf58b0f1.tar.xz
misc: eeprom: at24: fix regulator underflow
The at24 driver attempts to read a byte from the device to validate that it's actually present, and if not, disables the vcc regulator and returns -ENODEV. However, between the read and the error handling path, pm_runtime_idle() is called and invokes the driver's suspend callback, which also disables the vcc regulator. This leads to an underflow of the regulator enable count if the EEPROM is not present. Move the pm_runtime_suspend() call to be after the error handling path to resolve this. Fixes: cd5676db0574 ("misc: eeprom: at24: support pm_runtime control") Signed-off-by: Michael Auchter <michael.auchter@ni.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/misc/eeprom')
-rw-r--r--drivers/misc/eeprom/at24.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 031eb64549af..282c9ef68ed2 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -712,13 +712,14 @@ static int at24_probe(struct i2c_client *client)
* chip is functional.
*/
err = at24_read(at24, 0, &test_byte, 1);
- pm_runtime_idle(dev);
if (err) {
pm_runtime_disable(dev);
regulator_disable(at24->vcc_reg);
return -ENODEV;
}
+ pm_runtime_idle(dev);
+
if (writable)
dev_info(dev, "%u byte %s EEPROM, writable, %u bytes/write\n",
byte_len, client->name, at24->write_max);