[MTD] [OneNAND] omap2: panic_write may be in an interrupt context

panic_write may read in an interrupt context.
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/onenand/omap2.c

@@ -294,6 +294,10 @@ static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 	if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 		goto out_copy;
 
+	/* panic_write() may be in an interrupt context */
+	if (in_interrupt())
+		goto out_copy;
+
 	if (buf >= high_memory) {
 		struct page *p1;