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Commit d4653bf9 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
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i2c/eeprom: Only probe buses with DDC or SPD class 



The eeprom driver shouldn't probe i2c buses which don't want to be
probed.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 3401b2ff

drivers/i2c/chips/eeprom.c

+8 −0
Original line number Diff line number Diff line
@@ -159,6 +159,8 @@ static struct bin_attribute eeprom_attr = { 


static int eeprom_attach_adapter(struct i2c_adapter *adapter)

{

	if (!(adapter->class & (I2C_CLASS_DDC | I2C_CLASS_SPD)))

		return 0;

	return i2c_probe(adapter, &addr_data, eeprom_detect);

}
@@ -169,6 +171,12 @@ static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind) 
	struct eeprom_data *data;

	int err = 0;



	/* EDID EEPROMs are often 24C00 EEPROMs, which answer to all

	   addresses 0x50-0x57, but we only care about 0x50. So decline

	   attaching to addresses >= 0x51 on DDC buses */

	if (!(adapter->class & I2C_CLASS_SPD) && address >= 0x51)

		goto exit;



	/* There are three ways we can read the EEPROM data:

	   (1) I2C block reads (faster, but unsupported by most adapters)

	   (2) Consecutive byte reads (100% overhead)