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path: root/drivers/mmc/core/host.c
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Diffstat (limited to 'drivers/mmc/core/host.c')
-rw-r--r--drivers/mmc/core/host.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index c8fae6611b73..96b2ca1f1b06 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -377,6 +377,20 @@ int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
EXPORT_SYMBOL(mmc_of_parse_voltage);
/**
+ * mmc_first_nonreserved_index() - get the first index that is not reserved
+ */
+static int mmc_first_nonreserved_index(void)
+{
+ int max;
+
+ max = of_alias_get_highest_id("mmc");
+ if (max < 0)
+ return 0;
+
+ return max + 1;
+}
+
+/**
* mmc_alloc_host - initialise the per-host structure.
* @extra: sizeof private data structure
* @dev: pointer to host device model structure
@@ -387,6 +401,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
{
int err;
struct mmc_host *host;
+ int alias_id, min_idx, max_idx;
host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
if (!host)
@@ -395,7 +410,16 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
/* scanning will be enabled when we're ready */
host->rescan_disable = 1;
- err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
+ alias_id = of_alias_get_id(dev->of_node, "mmc");
+ if (alias_id >= 0) {
+ min_idx = alias_id;
+ max_idx = alias_id + 1;
+ } else {
+ min_idx = mmc_first_nonreserved_index();
+ max_idx = 0;
+ }
+
+ err = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
if (err < 0) {
kfree(host);
return NULL;