[Qemu-devel] [PATCH for 2.10 11/35] i2c/exynos4210: correctly check i2c_recv() return value

[Philippe Mathieu-Daudé]

i2c_recv() returns -1 on error, if the I2CCON_ACK_GEN bit was not set this code
was setting i2cds = -1.

i2c/exynos4210_i2c.c:117:20: warning: Loss of sign in implicit conversion
        s->i2cds = ret;
                   ^~~

Reported-by: Clang Static Analyzer
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
 hw/i2c/exynos4210_i2c.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/i2c/exynos4210_i2c.c b/hw/i2c/exynos4210_i2c.c
index c96fa7d7be..4424dbd233 100644
--- a/hw/i2c/exynos4210_i2c.c
+++ b/hw/i2c/exynos4210_i2c.c
@@ -111,10 +111,12 @@ static void exynos4210_i2c_data_receive(void *opaque)
     s->i2cstat &= ~I2CSTAT_LAST_BIT;
     s->scl_free = false;
     ret = i2c_recv(s->bus);
-    if (ret < 0 && (s->i2ccon & I2CCON_ACK_GEN)) {
-        s->i2cstat |= I2CSTAT_LAST_BIT;  /* Data is not acknowledged */
-    } else {
+    if (ret >= 0) {
         s->i2cds = ret;
+    } else {
+        if (s->i2ccon & I2CCON_ACK_GEN) {
+            s->i2cstat |= I2CSTAT_LAST_BIT;  /* Data is not acknowledged */
+        }
     }
     exynos4210_i2c_raise_interrupt(s);
 }
-- 
2.13.3