From b793f658b194edfe5e1d86aaeace01a7b03c68f9 Mon Sep 17 00:00:00 2001 From: Doug Anderson Date: Wed, 11 Mar 2015 15:15:14 -0700 Subject: [PATCH] mmc: dw_mmc: Don't try to enable the CD until we're sure we're not deferring If dw_mci_init_slot() returns that we got a probe deferral then it may leave slot->mmc as NULL. That will cause dw_mci_enable_cd() to crash when it calls mmc_gpio_get_cd(). Fix this by moving the call of dw_mci_enable_cd() until we're sure that we're good. Note that if we have more than one slot and one defers (but the others don't) things won't work so well. ...but that's not a new thing and everyone has already agreed that multislot support ought to be removed from dw_mmc eventually anyway since it is unused, untested, and you can see several bugs like this by inspecting the code. Fixes: bcafaf5470f0 ("mmc: dw_mmc: Only enable CD after setup and only if needed") Signed-off-by: Doug Anderson Signed-off-by: Jaehoon Chung Signed-off-by: Ulf Hansson --- drivers/mmc/host/dw_mmc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 8e0836d39081..3883fe6081da 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2890,9 +2890,6 @@ int dw_mci_probe(struct dw_mci *host) init_slots++; } - /* Now that slots are all setup, we can enable card detect */ - dw_mci_enable_cd(host); - if (init_slots) { dev_info(host->dev, "%d slots initialized\n", init_slots); } else { @@ -2901,6 +2898,9 @@ int dw_mci_probe(struct dw_mci *host) goto err_dmaunmap; } + /* Now that slots are all setup, we can enable card detect */ + dw_mci_enable_cd(host); + if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n"); -- 2.20.1