mtd: m25p80: make command buffer DMA-safe

spi_write() requires the buffer to be DMA-safe, kmalloc()
it seperately to ensure this.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 933267a7a2a6..291d5d91892d 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -78,7 +78,7 @@ struct m25p {
         struct mtd_info         mtd;
         unsigned                partitioned:1;
         u8                      erase_opcode;
-        u8                      command[CMD_SIZE + FAST_READ_DUMMY_BYTE];
+        u8                      *command;
 };
 
 static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd)
@@ -769,6 +769,11 @@ static int __devinit m25p_probe(struct spi_device *spi)
         flash = kzalloc(sizeof *flash, GFP_KERNEL);
         if (!flash)
                 return -ENOMEM;
+        flash->command = kmalloc(CMD_SIZE + FAST_READ_DUMMY_BYTE, GFP_KERNEL);
+        if (!flash->command) {
+                kfree(flash);
+                return -ENOMEM;
+        }
 
         flash->spi = spi;
         mutex_init(&flash->lock);
@@ -888,8 +893,10 @@ static int __devexit m25p_remove(struct spi_device *spi)
                 status = del_mtd_partitions(&flash->mtd);
         else
                 status = del_mtd_device(&flash->mtd);
-        if (status == 0)
+        if (status == 0) {
+                kfree(flash->command);
                 kfree(flash);
+        }
         return 0;
 }