mmc_gpio_get_cd returns a negative error value upon failure.
However gpio_cd was initialised with the negated return value
of the above function. This negation resulted in losing of the
error value thereby triggering the code to take a wrong path as
IS_ERR_VALUE(gpio_cd) now returned 0 even when mmc_gpio_get_cd
returned an error value. This issue introduced by commit bf626e5550f2
("mmc: dw_mmc: use slot-gpio to handle cd pin") caused card detection
failure on Exynos5 boards which is now fixed by this patch.
Signed-off-by: Sachin Kamat <sachin.kamat@xxxxxxxxxx>
Cc: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
Cc: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a776f24f4311..f1683ba194ee 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1033,7 +1033,7 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
int present;
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci_board *brd = slot->host->pdata;
- int gpio_cd = !mmc_gpio_get_cd(mmc);
+ int gpio_cd = mmc_gpio_get_cd(mmc);
/* Use platform get_cd function, else try onboard card detect */
if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
@@ -1041,7 +1041,7 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
else if (brd->get_cd)
present = !brd->get_cd(slot->id);
else if (!IS_ERR_VALUE(gpio_cd))
- present = !!gpio_cd;
+ present = !gpio_cd;
else
present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
== 0 ? 1 : 0;
--
1.7.9.5
--
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