mmc: Flush pending detects on host removal

Make sure we kill of any pending detection runs when the host
is removed instead of when it is freed. Also add some debugging
to make sure the driver doesn't queue up more detection after it
has removed the host.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 17 insertions, 1 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 9ffeeb2cba45..0242c6a21daf 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1550,6 +1550,12 @@ static void mmc_setup(struct mmc_host *host)
  */
 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 {
+#ifdef CONFIG_MMC_DEBUG
+        mmc_claim_host(host);
+        BUG_ON(host->removed);
+        mmc_release_host(host);
+#endif
+
         mmc_schedule_delayed_work(&host->detect, delay);
 }
 
@@ -1690,6 +1696,14 @@ void mmc_remove_host(struct mmc_host *host)
 {
         struct list_head *l, *n;
 
+#ifdef CONFIG_MMC_DEBUG
+        mmc_claim_host(host);
+        host->removed = 1;
+        mmc_release_host(host);
+#endif
+
+        mmc_flush_scheduled_work();
+
         list_for_each_safe(l, n, &host->cards) {
                 struct mmc_card *card = mmc_list_to_card(l);
 
@@ -1710,7 +1724,6 @@ EXPORT_SYMBOL(mmc_remove_host);
  */
 void mmc_free_host(struct mmc_host *host)
 {
-        mmc_flush_scheduled_work();
         mmc_free_host_sysfs(host);
 }
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c89f41091304..92efe8e5be7e 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -147,6 +147,9 @@ struct mmc_host {
         struct mmc_card         *card_selected; /* the selected MMC card */
 
         struct delayed_work     detect;
+#ifdef CONFIG_MMC_DEBUG
+        unsigned int            removed:1;      /* host is being removed */
+#endif
 
         unsigned long           private[0] ____cacheline_aligned;
 };