hw/i2c/aspeed_i2c.c: Add a check for dma_read

If aspeed_i2c_dma_read fails in aspeed_i2c_bus_send currently, we get
stuck in an infinite retry loop. Add a check for the return value of
aspeed_i2c_dma_read that will break us out of said loop.

Signed-off-by: Nabih Estefan <nabihestefan@google.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Fixes: 545d6bef7097 ("aspeed/i2c: Add support for DMA transfers")
Link: https://lore.kernel.org/qemu-devel/20260120211116.1367476-1-nabihestefan@google.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/i2c/aspeed_i2c.c b/hw/i2c/aspeed_i2c.c
index 7cf92423c740f5e02e718e84564e583c8aa2715b..1ee73a8f5e781fe423e747ab1cb1757eda3d52eb 100644 (file)
--- a/hw/i2c/aspeed_i2c.c
+++ b/hw/i2c/aspeed_i2c.c
@@ -272,7 +272,11 @@ static int aspeed_i2c_bus_send(AspeedI2CBus *bus)
         }
         while (bus->regs[reg_dma_len]) {
             uint8_t data;
-            aspeed_i2c_dma_read(bus, &data);
+            ret = aspeed_i2c_dma_read(bus, &data);
+            /* Check that we were able to read the DMA */
+            if (ret) {
+                break;
+            }
             trace_aspeed_i2c_bus_send("DMA", bus->regs[reg_dma_len],
                                       bus->regs[reg_dma_len], data);
             ret = i2c_send(bus->bus, data);