Commit 49695ac4 authored by Jean-Francois Dagenais's avatar Jean-Francois Dagenais Committed by Greg Kroah-Hartman
Browse files

w1: ds2408: reset on output_write retry with readback 



When we have success in 'Channel Access Write' but reading back latch
states fails, a write is retried without doing a proper slave reset.
This leads to protocol errors as the slave treats the next 'Channel
Access Write' as the continuation of previous command.

This commit is fixing this by making sure if the retry loop re-runs, a
reset is performed, whatever the failure (CONFIRM_BYTE or the read
back).

The loop was quite due for a cleanup and this change mandated it. By
isolating the CONFIG_W1_SLAVE_DS2408_READBACK case into it's own
function, we vastly reduce the visual and branching(runtime and
compile-time) noise.

Reported-by: default avatarMariusz Bialonczyk <manio@skyboo.net>
Tested-by: default avatarMariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: default avatarJean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b909ef83

drivers/w1/slaves/w1_ds2408.c

+39 −37
Original line number Diff line number Diff line
@@ -138,14 +138,37 @@ static ssize_t status_control_read(struct file *filp, struct kobject *kobj, 
		W1_F29_REG_CONTROL_AND_STATUS, buf);

}



#ifdef fCONFIG_W1_SLAVE_DS2408_READBACK

static bool optional_read_back_valid(struct w1_slave *sl, u8 expected)

{

	u8 w1_buf[3];



	if (w1_reset_resume_command(sl->master))

		return false;



	w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS;

	w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE;

	w1_buf[2] = 0;



	w1_write_block(sl->master, w1_buf, 3);



	return (w1_read_8(sl->master) == expected);

}

#else

static bool optional_read_back_valid(struct w1_slave *sl, u8 expected)

{

	return true;

}

#endif



static ssize_t output_write(struct file *filp, struct kobject *kobj,

			    struct bin_attribute *bin_attr, char *buf,

			    loff_t off, size_t count)

{

	struct w1_slave *sl = kobj_to_w1_slave(kobj);

	u8 w1_buf[3];

	u8 readBack;

	unsigned int retries = W1_F29_RETRIES;

	ssize_t bytes_written = -EIO;



	if (count != 1 || off != 0)

		return -EFAULT;
@@ -155,54 +178,33 @@ static ssize_t output_write(struct file *filp, struct kobject *kobj, 
	dev_dbg(&sl->dev, "mutex locked");



	if (w1_reset_select_slave(sl))

		goto error;

		goto out;



	while (retries--) {

	do {

		w1_buf[0] = W1_F29_FUNC_CHANN_ACCESS_WRITE;

		w1_buf[1] = *buf;

		w1_buf[2] = ~(*buf);

		w1_write_block(sl->master, w1_buf, 3);



		readBack = w1_read_8(sl->master);

		w1_write_block(sl->master, w1_buf, 3);



		if (readBack != W1_F29_SUCCESS_CONFIRM_BYTE) {

			if (w1_reset_resume_command(sl->master))

				goto error;

			/* try again, the slave is ready for a command */

			continue;

		if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE &&

		    optional_read_back_valid(sl, *buf)) {

			bytes_written = 1;

			goto out;

		}



#ifdef CONFIG_W1_SLAVE_DS2408_READBACK

		/* here the master could read another byte which

		   would be the PIO reg (the actual pin logic state)

		   since in this driver we don't know which pins are

		   in and outs, there's no value to read the state and

		   compare. with (*buf) so end this command abruptly: */

		if (w1_reset_resume_command(sl->master))

			goto error;

			goto out; /* unrecoverable error */

		/* try again, the slave is ready for a command */

	} while (--retries);



		/* go read back the output latches */

		/* (the direct effect of the write above) */

		w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS;

		w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE;

		w1_buf[2] = 0;

		w1_write_block(sl->master, w1_buf, 3);

		/* read the result of the READ_PIO_REGS command */

		if (w1_read_8(sl->master) == *buf)

#endif

		{

			/* success! */

			mutex_unlock(&sl->master->bus_mutex);

			dev_dbg(&sl->dev,

				"mutex unlocked, retries:%d", retries);

			return 1;

		}

	}

error:

out:

	mutex_unlock(&sl->master->bus_mutex);

	dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries);



	return -EIO;

	dev_dbg(&sl->dev, "%s, mutex unlocked retries:%d\n",

		(bytes_written > 0) ? "succeeded" : "error", retries);



	return bytes_written;

}

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