From 311c3c10f6429f4405be6a0e98cb27c6995ca8b9 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Wed, 21 Sep 2011 14:08:13 -0400 Subject: mmc: core: Fix hangs related to insert/remove of cards commit 7f7e4129c23f0419257184dff6fec89d2d5a8964 upstream. During a rescan operation mmc_attach(sd|mmc|sdio) functions are called. The error handling in these function can trigger a detach of the bus, which also meant a power off. This is not notified by the rescan operation which then continues to the next attach function. If a power off has been done, the framework must never send any new commands to the host driver, without first doing a new power up. This will most likely trigger any host driver to hang. Moving power off out of detach and instead handle power off separately when it is actually needed, solves the issue. Signed-off-by: Ulf Hansson Acked-by: Linus Walleij Signed-off-by: Chris Ball Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/mmc.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/mmc/core/mmc.c') diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index aa7d1d79b8c5..6f5ee84ec716 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -891,6 +891,7 @@ static void mmc_detect(struct mmc_host *host) mmc_claim_host(host); mmc_detach_bus(host); + mmc_power_off(host); mmc_release_host(host); } } -- cgit v1.2.3