We neglected to clear the @data_count index on ADMA error,
allowing to trigger assertion in sdhci_read_dataport() or
sdhci_write_dataport().

Cc: qemu-stable@nongnu.org
Fixes: d7dfca0807 ("hw/sdhci: introduce standard SD host controller")
Reported-by: Zheyu Ma <zheyuma97@gmail.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2455
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240730092138.32443-4-philmd@linaro.org>
---
 hw/sd/sdhci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index d02c3e3963..8293d83556 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -846,6 +846,7 @@ static void sdhci_do_adma(SDHCIState *s)
                 }
             }
             if (res != MEMTX_OK) {
+                s->data_count = 0;
                 if (s->errintstsen & SDHC_EISEN_ADMAERR) {
                     trace_sdhci_error("Set ADMA error flag");
                     s->errintsts |= SDHC_EIS_ADMAERR;
-- 
2.45.2