[PATCH v2 1/2] mtd: cfi_cmdset_0002: only check errors when ready in cfi_check_err_status()

[Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>]

Cypress S26K{L|S}P{128|256|512}S datasheet says that the error bits in
the status register are only valid when the "device ready" bit 7 is set.
Add the check for the device ready bit in cfi_check_err_status() as that
function isn't always called with this bit set.

Fixes: 4844ef80305d ("mtd: cfi_cmdset_0002: Add support for polling status register")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>

---
Changes in version 2:
- refreshed the patch.

 drivers/mtd/chips/cfi_cmdset_0002.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/drivers/mtd/chips/cfi_cmdset_0002.c
===================================================================
--- linux.orig/drivers/mtd/chips/cfi_cmdset_0002.c
+++ linux/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -136,6 +136,10 @@ static void cfi_check_err_status(struct
 			 cfi->device_type, NULL);
 	status = map_read(map, adr);
 
+	/* The error bits are invalid while the chip's busy */
+	if (!map_word_bitsset(map, status, CMD(CFI_SR_DRB)))
+		return;
+
 	if (map_word_bitsset(map, status, CMD(0x3a))) {
 		unsigned long chipstatus = MERGESTATUS(status);
 

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