diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch b/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch new file mode 100644 index 0000000000..6c0a304f1c --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch @@ -0,0 +1,64 @@ +From 3280ce5f5483a351f49e84b48ad98df87989346a Mon Sep 17 00:00:00 2001 +From: Mariusz Bialonczyk <manio@skyboo.net> +Date: Mon, 20 May 2019 09:05:55 +0200 +Subject: [PATCH] w1: ds2413: output_write() cosmetic fixes / simplify + +commit ae2ee27aa985232f66421d7cd1c7f4b87c7dba7d upstream. + +Make the output_write simpler. +Based on Jean-Francois Dagenais code from: +49695ac46861 ("w1: ds2408: reset on output_write retry with readback") + +Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/w1/slaves/w1_ds2413.c | 19 +++++++++++-------- + 1 file changed, 11 insertions(+), 8 deletions(-) + +--- a/drivers/w1/slaves/w1_ds2413.c ++++ b/drivers/w1/slaves/w1_ds2413.c +@@ -69,6 +69,7 @@ static ssize_t output_write(struct file + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 w1_buf[3]; + unsigned int retries = W1_F3A_RETRIES; ++ ssize_t bytes_written = -EIO; + + if (count != 1 || off != 0) + return -EFAULT; +@@ -78,7 +79,7 @@ static ssize_t output_write(struct file + dev_dbg(&sl->dev, "mutex locked"); + + if (w1_reset_select_slave(sl)) +- goto error; ++ goto out; + + /* according to the DS2413 datasheet the most significant 6 bits + should be set to "1"s, so do it now */ +@@ -91,18 +92,20 @@ static ssize_t output_write(struct file + w1_write_block(sl->master, w1_buf, 3); + + if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) { +- mutex_unlock(&sl->master->bus_mutex); +- dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries); +- return 1; ++ bytes_written = 1; ++ goto out; + } + if (w1_reset_resume_command(sl->master)) +- goto error; ++ goto out; /* unrecoverable error */ ++ ++ dev_warn(&sl->dev, "PIO_ACCESS_WRITE error, retries left: %d\n", retries); + } + +-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; + } + + static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1); |