driver: mtd: sf_ops: claim bus while doing memcpy

claim spi bus while doing memory copy, this will set up
the spi controller device control register before doing
a memory read.

Signed-off-by: Sourav Poddar <[email protected]>
Tested-by: Yebio Mesfin <[email protected]>
Reviewed-by: Jagannadha Sutradharudu Teki <[email protected]>

diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index 108665f4415f60433ccefa596b1c39e3836d5017..e316a692a8de61f0870b0022256cd44b30f71003 100644 (file)
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -273,9 +273,15 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 
        /* Handle memory-mapped SPI */
        if (flash->memory_map) {
+               ret = spi_claim_bus(flash->spi);
+               if (ret) {
+                       debug("SF: unable to claim SPI bus\n");
+                       return ret;
+               }
                spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP);
                memcpy(data, flash->memory_map + offset, len);
                spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP_END);
+               spi_release_bus(flash->spi);
                return 0;
        }