mmc: prohibit card detection when host is not ready

Currently mmc host drivers have to decide whether to enable card
detection before calling mmc_add_host() -- in which case a card
insertion event can arrive before the host has been completely
initialised -- or after mmc_add_host(), in which case the initial
card detection can be problematic.

This patch adds an explicit indication of when card detection should
not be carried out. With it in place enabling card detection before
calling mmc_add_host() should be safe. Similarly, disabling it again
after calling mmc_remove_host() will avoid any races.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 8d00aef9523..9503cabc96f 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2107,6 +2107,7 @@ void mmc_rescan(struct work_struct *work)
 void mmc_start_host(struct mmc_host *host)
 {
         host->f_init = max(freqs[0], host->f_min);
+        host->rescan_disable = 0;
         mmc_power_up(host);
         mmc_detect_change(host, 0);
 }
@@ -2120,6 +2121,7 @@ void mmc_stop_host(struct mmc_host *host)
         spin_unlock_irqrestore(&host->lock, flags);
 #endif
 
+        host->rescan_disable = 1;
         cancel_delayed_work_sync(&host->detect);
         mmc_flush_scheduled_work();