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[Qemu-devel] [PATCH v3 3/6] tmp105: Fix I2C protocol bug
From: |
Andreas Färber |
Subject: |
[Qemu-devel] [PATCH v3 3/6] tmp105: Fix I2C protocol bug |
Date: |
Mon, 7 Jan 2013 23:42:21 +0100 |
An early length postincrement in the TMP105's I2C TX path led to
transfers of more than one byte to place the second byte in the third
byte's place within the buffer and the third byte to get discarded.
Fix this by explictly incrementing the length after the checks but
before the callback is called, which again checks the length.
Adjust the Coding Style while at it.
Signed-off-by: Alex Horn <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
Reviewed-by: Anthony Liguori <address@hidden>
---
hw/tmp105.c | 9 ++++++---
1 Datei geändert, 6 Zeilen hinzugefügt(+), 3 Zeilen entfernt(-)
diff --git a/hw/tmp105.c b/hw/tmp105.c
index 9c67e64..ff9f28b 100644
--- a/hw/tmp105.c
+++ b/hw/tmp105.c
@@ -153,11 +153,14 @@ static int tmp105_tx(I2CSlave *i2c, uint8_t data)
{
TMP105State *s = (TMP105State *) i2c;
- if (!s->len ++)
+ if (s->len == 0) {
s->pointer = data;
- else {
- if (s->len <= 2)
+ s->len++;
+ } else {
+ if (s->len <= 2) {
s->buf[s->len - 1] = data;
+ }
+ s->len++;
tmp105_write(s);
}
--
1.7.10.4
- [Qemu-devel] [PATCH v3 0/6] I2C libqos and tmp105 qtest support, Andreas Färber, 2013/01/07
- [Qemu-devel] [PATCH v3 6/6] tmp105: Add temperature QOM property, Andreas Färber, 2013/01/07
- [Qemu-devel] [PATCH v3 3/6] tmp105: Fix I2C protocol bug,
Andreas Färber <=
- [Qemu-devel] [PATCH v3 2/6] tmp105: Split out I2C message constants from header, Andreas Färber, 2013/01/07
- [Qemu-devel] [PATCH v3 4/6] tests: Add tmp105 qtest test case, Andreas Färber, 2013/01/07
- [Qemu-devel] [PATCH v3 1/6] libqtest: Prepare I2C libqos, Andreas Färber, 2013/01/07
- [Qemu-devel] [PATCH v3 5/6] tmp105: QOM'ify, Andreas Färber, 2013/01/07