[U-Boot] [PATCH 1/2 V3] esdhc: memset mmc struct before putting into use

[Haijun Zhang]

struct mmc should be clear to all '0' after malloc to avoid
unexpect variable value.

Like mmc->has_init = xxx.
In this case mmcinfo will believe the card had been initialized before
and skip the initialization.

Test on P5040 and T4240,
Error Log:

=> mmcinfo
Device: FSL_SDHC
Manufacturer ID: 0
OEM: 0
Name: Tran Speed: 0
Rd Block Len: 0
MMC version 0.0
High Capacity: No
Capacity: 0 Bytes
Bus Width: 0-bit
=>

Signed-off-by: Haijun Zhang <Haijun.Zhang at freescale.com>
Signed-off-by: Xie Shaohui-B21989 <B21989 at freescale.com>
Tested-by: Ryan Barnett <rjbarnet at rockwellcollins.com>
---
changes for V3:
	- Only add Tested-by no other changes
changes for V2:
	- No changes

 drivers/mmc/fsl_esdhc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index a7170b4..d4c1eef 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -521,6 +521,7 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
 	if (!mmc)
 		return -ENOMEM;
 
+	memset(mmc, 0, sizeof(struct mmc));
 	sprintf(mmc->name, "FSL_SDHC");
 	regs = (struct fsl_esdhc *)cfg->esdhc_base;
 
-- 
1.8.4