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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 <dianders@chromium.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson 2015-03-11 15:15:14 -07:00 committed by Ulf Hansson
parent 5c935165da
commit b793f658b1
1 changed files with 3 additions and 3 deletions
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6
drivers/mmc/host/dw_mmc.c
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@ -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");