sfc: Expose flash region storing boot code as MTD

The boot code that appears as a PCI expansion ROM on the SFC4000 is
stored in flash.  Expose this as a standard MTD device to allow for
in-place upgrades.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index df0579e386f7..abd8fcd6e62d 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -554,8 +554,10 @@ static int efx_ethtool_get_eeprom(struct net_device *net_dev,
         size_t len;
         int rc;
 
+        mutex_lock(&efx->spi_lock);
         rc = falcon_spi_read(spi, eeprom->offset + EFX_EEPROM_BOOTCONFIG_START,
                              eeprom->len, &len, buf);
+        mutex_unlock(&efx->spi_lock);
         eeprom->magic = EFX_ETHTOOL_EEPROM_MAGIC;
         eeprom->len = len;
         return rc;
@@ -572,8 +574,10 @@ static int efx_ethtool_set_eeprom(struct net_device *net_dev,
         if (eeprom->magic != EFX_ETHTOOL_EEPROM_MAGIC)
                 return -EINVAL;
 
+        mutex_lock(&efx->spi_lock);
         rc = falcon_spi_write(spi, eeprom->offset + EFX_EEPROM_BOOTCONFIG_START,
                               eeprom->len, &len, buf);
+        mutex_unlock(&efx->spi_lock);
         eeprom->len = len;
         return rc;
 }