mmc: Register only the first MMC device on MMC_TINY
When MMC_TINY is enabled, support for only one MMC device
is provided. Boards that register more than one device,
will just write over mmc_static keeping only the last one
registered.
This commit prevents this, keeping only the first MMC
device created. A debug warning message is added, if nothing
else, as a hint/documentation for developers.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
diff --git a/drivers/mmc/mmc_legacy.c b/drivers/mmc/mmc_legacy.c
index 66a7cda..b0f5cf5 100644
--- a/drivers/mmc/mmc_legacy.c
+++ b/drivers/mmc/mmc_legacy.c
@@ -150,6 +150,15 @@
{
struct mmc *mmc = &mmc_static;
+ /* First MMC device registered, fail to register a new one.
+ * Given users are not expecting this to fail, instead
+ * of failing let's just return the only MMC device
+ */
+ if (mmc->cfg) {
+ debug("Warning: MMC_TINY doesn't support multiple MMC devices\n");
+ return mmc;
+ }
+
mmc->cfg = cfg;
mmc->priv = priv;