nand_base: fix for ONFI chips that do not support GET/SET FEATURES

[David Mosberger-Tang]

The attached patch is relative to linux-mtd.  It fixes a problem with
NAND-chips that are ONFI-compliant but don't support the SET/GET
FEATURES commands (such as Spansion S34Mx).

  --david
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diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index dfcd0a5..13c8043 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2720,7 +2720,9 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int status;
 
-	if (!chip->onfi_version)
+	if (!chip->onfi_version ||
+	    // supports GET/SET FEATURES?
+	    !(le16_to_cpu(chip->onfi_params.opt_cmd) & 4))
 		return -EINVAL;
 
 	chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, addr, -1);
@@ -2741,7 +2743,9 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip,
 			int addr, uint8_t *subfeature_param)
 {
-	if (!chip->onfi_version)
+	if (!chip->onfi_version ||
+	    // supports GET/SET FEATURES?
+	    !(le16_to_cpu(chip->onfi_params.opt_cmd) & 4))
 		return -EINVAL;
 
 	/* clear the sub feature parameters */