hw/i2c/bitbang_i2c: Use in-place rather than malloc'd bitbang_i2c_interface struct

Currently the bitbang_i2c_init() function allocates a
bitbang_i2c_interface struct which it returns.  This is unfortunate
because it means that if the function is used from a DeviceState
init method then the memory will be leaked by an "init then delete"
cycle, as used by the qmp/hmp commands that list device properties.

Since three out of four of the uses of this function are in
device init methods, switch the function to do an in-place
initialization of a struct that can be embedded in the
device state struct of the caller.

This fixes LeakSanitizer leak warnings that have appeared in the
patchew configuration (which only tries to run the sanitizers
for the x86_64-softmmu target) now that we use the bitbang-i2c
code in an x86-64 config.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190702163844.20458-1-peter.maydell@linaro.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/display/ati.c b/hw/display/ati.c
index 0cb1173848390a62107d7a250f4e6017f90d47b0..c1d9d1518f4ac03f68d1edc47d1125b95634a055 100644 (file)
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -538,7 +538,7 @@ static void ati_mm_write(void *opaque, hwaddr addr,
         break;
     case GPIO_DVI_DDC:
         if (s->dev_id != PCI_DEVICE_ID_ATI_RAGE128_PF) {
-            s->regs.gpio_dvi_ddc = ati_i2c(s->bbi2c, data, 0);
+            s->regs.gpio_dvi_ddc = ati_i2c(&s->bbi2c, data, 0);
         }
         break;
     case GPIO_MONID ... GPIO_MONID + 3:
@@ -554,7 +554,7 @@ static void ati_mm_write(void *opaque, hwaddr addr,
              */
             if ((s->regs.gpio_monid & BIT(25)) &&
                 addr <= GPIO_MONID + 2 && addr + size > GPIO_MONID + 2) {
-                s->regs.gpio_monid = ati_i2c(s->bbi2c, s->regs.gpio_monid, 1);
+                s->regs.gpio_monid = ati_i2c(&s->bbi2c, s->regs.gpio_monid, 1);
             }
         }
         break;
@@ -856,7 +856,7 @@ static void ati_vga_realize(PCIDevice *dev, Error **errp)
 
     /* ddc, edid */
     I2CBus *i2cbus = i2c_init_bus(DEVICE(s), "ati-vga.ddc");
-    s->bbi2c = bitbang_i2c_init(i2cbus);
+    bitbang_i2c_init(&s->bbi2c, i2cbus);
     I2CSlave *i2cddc = I2C_SLAVE(qdev_create(BUS(i2cbus), TYPE_I2CDDC));
     i2c_set_slave_address(i2cddc, 0x50);
 
@@ -885,7 +885,6 @@ static void ati_vga_exit(PCIDevice *dev)
     ATIVGAState *s = ATI_VGA(dev);
 
     graphic_console_close(s->vga.con);
-    g_free(s->bbi2c);
 }
 
 static Property ati_vga_properties[] = {

diff --git a/hw/display/ati_int.h b/hw/display/ati_int.h
index 9b67d0022ad97db4e6c31bbf86f76173997abdb9..31a1927b3ecbbc8fcb586ac9954fa1edb1be9c50 100644 (file)
--- a/hw/display/ati_int.h
+++ b/hw/display/ati_int.h
@@ -88,7 +88,7 @@ typedef struct ATIVGAState {
     uint16_t cursor_size;
     uint32_t cursor_offset;
     QEMUCursor *cursor;
-    bitbang_i2c_interface *bbi2c;
+    bitbang_i2c_interface bbi2c;
     MemoryRegion io;
     MemoryRegion mm;
     ATIVGARegs regs;

diff --git a/hw/i2c/bitbang_i2c.c b/hw/i2c/bitbang_i2c.c
index 3cb0509b0200b1fb57750deeea01bb1ee0151a35..60c7a9be0bcaf57720fe360786be668c4747003f 100644 (file)
--- a/hw/i2c/bitbang_i2c.c
+++ b/hw/i2c/bitbang_i2c.c
@@ -25,39 +25,6 @@ do { printf("bitbang_i2c: " fmt , ## __VA_ARGS__); } while (0)
 #define DPRINTF(fmt, ...) do {} while(0)
 #endif
 
-typedef enum bitbang_i2c_state {
-    STOPPED = 0,
-    SENDING_BIT7,
-    SENDING_BIT6,
-    SENDING_BIT5,
-    SENDING_BIT4,
-    SENDING_BIT3,
-    SENDING_BIT2,
-    SENDING_BIT1,
-    SENDING_BIT0,
-    WAITING_FOR_ACK,
-    RECEIVING_BIT7,
-    RECEIVING_BIT6,
-    RECEIVING_BIT5,
-    RECEIVING_BIT4,
-    RECEIVING_BIT3,
-    RECEIVING_BIT2,
-    RECEIVING_BIT1,
-    RECEIVING_BIT0,
-    SENDING_ACK,
-    SENT_NACK
-} bitbang_i2c_state;
-
-struct bitbang_i2c_interface {
-    I2CBus *bus;
-    bitbang_i2c_state state;
-    int last_data;
-    int last_clock;
-    int device_out;
-    uint8_t buffer;
-    int current_addr;
-};
-
 static void bitbang_i2c_enter_stop(bitbang_i2c_interface *i2c)
 {
     DPRINTF("STOP\n");
@@ -184,18 +151,12 @@ int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level)
     abort();
 }
 
-bitbang_i2c_interface *bitbang_i2c_init(I2CBus *bus)
+void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus)
 {
-    bitbang_i2c_interface *s;
-
-    s = g_malloc0(sizeof(bitbang_i2c_interface));
-
     s->bus = bus;
     s->last_data = 1;
     s->last_clock = 1;
     s->device_out = 1;
-
-    return s;
 }
 
 /* GPIO interface.  */
@@ -207,7 +168,7 @@ typedef struct GPIOI2CState {
     SysBusDevice parent_obj;
 
     MemoryRegion dummy_iomem;
-    bitbang_i2c_interface *bitbang;
+    bitbang_i2c_interface bitbang;
     int last_level;
     qemu_irq out;
 } GPIOI2CState;
@@ -216,7 +177,7 @@ static void bitbang_i2c_gpio_set(void *opaque, int irq, int level)
 {
     GPIOI2CState *s = opaque;
 
-    level = bitbang_i2c_set(s->bitbang, irq, level);
+    level = bitbang_i2c_set(&s->bitbang, irq, level);
     if (level != s->last_level) {
         s->last_level = level;
         qemu_set_irq(s->out, level);
@@ -234,7 +195,7 @@ static void gpio_i2c_init(Object *obj)
     sysbus_init_mmio(sbd, &s->dummy_iomem);
 
     bus = i2c_init_bus(dev, "i2c");
-    s->bitbang = bitbang_i2c_init(bus);
+    bitbang_i2c_init(&s->bitbang, bus);
 
     qdev_init_gpio_in(dev, bitbang_i2c_gpio_set, 2);
     qdev_init_gpio_out(dev, &s->out, 1);

diff --git a/hw/i2c/ppc4xx_i2c.c b/hw/i2c/ppc4xx_i2c.c
index 5fb4f86c38f15a340e26ca3ee40a274e340d945f..462729db4ea7810b83901fcad3376a637fa42fa5 100644 (file)
--- a/hw/i2c/ppc4xx_i2c.c
+++ b/hw/i2c/ppc4xx_i2c.c
@@ -311,9 +311,9 @@ static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value,
     case IIC_DIRECTCNTL:
         i2c->directcntl = value & (IIC_DIRECTCNTL_SDAC & IIC_DIRECTCNTL_SCLC);
         i2c->directcntl |= (value & IIC_DIRECTCNTL_SCLC ? 1 : 0);
-        bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SCL,
+        bitbang_i2c_set(&i2c->bitbang, BITBANG_I2C_SCL,
                         i2c->directcntl & IIC_DIRECTCNTL_MSCL);
-        i2c->directcntl |= bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SDA,
+        i2c->directcntl |= bitbang_i2c_set(&i2c->bitbang, BITBANG_I2C_SDA,
                                (value & IIC_DIRECTCNTL_SDAC) != 0) << 1;
         break;
     default:
@@ -347,7 +347,7 @@ static void ppc4xx_i2c_init(Object *o)
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
     s->bus = i2c_init_bus(DEVICE(s), "i2c");
-    s->bitbang = bitbang_i2c_init(s->bus);
+    bitbang_i2c_init(&s->bitbang, s->bus);
 }
 
 static void ppc4xx_i2c_class_init(ObjectClass *klass, void *data)

diff --git a/hw/i2c/versatile_i2c.c b/hw/i2c/versatile_i2c.c
index 24b6e36b6d52ebb10099f11d63285117d5c25327..1ac2a6f59a0aa82fff4cc2e0e92af17b9cee257f 100644 (file)
--- a/hw/i2c/versatile_i2c.c
+++ b/hw/i2c/versatile_i2c.c
@@ -35,7 +35,7 @@ typedef struct VersatileI2CState {
     SysBusDevice parent_obj;
 
     MemoryRegion iomem;
-    bitbang_i2c_interface *bitbang;
+    bitbang_i2c_interface bitbang;
     int out;
     int in;
 } VersatileI2CState;
@@ -70,8 +70,8 @@ static void versatile_i2c_write(void *opaque, hwaddr offset,
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%x\n", __func__, (int)offset);
     }
-    bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
-    s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
+    bitbang_i2c_set(&s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
+    s->in = bitbang_i2c_set(&s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
 }
 
 static const MemoryRegionOps versatile_i2c_ops = {
@@ -88,7 +88,7 @@ static void versatile_i2c_init(Object *obj)
     I2CBus *bus;
 
     bus = i2c_init_bus(dev, "i2c");
-    s->bitbang = bitbang_i2c_init(bus);
+    bitbang_i2c_init(&s->bitbang, bus);
     memory_region_init_io(&s->iomem, obj, &versatile_i2c_ops, s,
                           "versatile_i2c", 0x1000);
     sysbus_init_mmio(sbd, &s->iomem);

diff --git a/include/hw/i2c/bitbang_i2c.h b/include/hw/i2c/bitbang_i2c.h
index 3a7126d5dee87866b434af60b214e1250cb78297..92334e9016a8a01acb3f182a60a65736f9081c30 100644 (file)
--- a/include/hw/i2c/bitbang_i2c.h
+++ b/include/hw/i2c/bitbang_i2c.h
@@ -8,7 +8,43 @@ typedef struct bitbang_i2c_interface bitbang_i2c_interface;
 #define BITBANG_I2C_SDA 0
 #define BITBANG_I2C_SCL 1
 
-bitbang_i2c_interface *bitbang_i2c_init(I2CBus *bus);
+typedef enum bitbang_i2c_state {
+    STOPPED = 0,
+    SENDING_BIT7,
+    SENDING_BIT6,
+    SENDING_BIT5,
+    SENDING_BIT4,
+    SENDING_BIT3,
+    SENDING_BIT2,
+    SENDING_BIT1,
+    SENDING_BIT0,
+    WAITING_FOR_ACK,
+    RECEIVING_BIT7,
+    RECEIVING_BIT6,
+    RECEIVING_BIT5,
+    RECEIVING_BIT4,
+    RECEIVING_BIT3,
+    RECEIVING_BIT2,
+    RECEIVING_BIT1,
+    RECEIVING_BIT0,
+    SENDING_ACK,
+    SENT_NACK
+} bitbang_i2c_state;
+
+struct bitbang_i2c_interface {
+    I2CBus *bus;
+    bitbang_i2c_state state;
+    int last_data;
+    int last_clock;
+    int device_out;
+    uint8_t buffer;
+    int current_addr;
+};
+
+/**
+ * bitbang_i2c_init: in-place initialize the bitbang_i2c_interface struct
+ */
+void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
 int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
 
 #endif

diff --git a/include/hw/i2c/ppc4xx_i2c.h b/include/hw/i2c/ppc4xx_i2c.h
index 8437bf070b8bbc7dfba324ab0c53db6b91af0d21..f6f837fbec00aae240a8cf08a1075b84ea7d41ae 100644 (file)
--- a/include/hw/i2c/ppc4xx_i2c.h
+++ b/include/hw/i2c/ppc4xx_i2c.h
@@ -41,7 +41,7 @@ typedef struct PPC4xxI2CState {
     I2CBus *bus;
     qemu_irq irq;
     MemoryRegion iomem;
-    bitbang_i2c_interface *bitbang;
+    bitbang_i2c_interface bitbang;
     int mdidx;
     uint8_t mdata[4];
     uint8_t lmadr;