Currently the master->setup() is called unconditionally.
The assumption is that every driver need to implement this
callback. This encourages drivers to populate empty functions
to prevent crashing.
This patch prevents the call of master->setup() if it is not
populated.
Signed-off-by: Laxman Dewangan <ldewan...@nvidia.com>
---
When developing the driver for tegra20 sflash driver, found
that there is notung to do in setup and hence in palce of
adding the empty API, creating this patch.
drivers/spi/spi.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 6891a03..37a8a2f 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1159,7 +1159,7 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
int spi_setup(struct spi_device *spi)
{
unsigned bad_bits;
- int status;
+ int status = 0;
/* help drivers fail *cleanly* when they need options
* that aren't supported with their current master
@@ -1174,7 +1174,8 @@ int spi_setup(struct spi_device *spi)
if (!spi->bits_per_word)
spi->bits_per_word = 8;
- status = spi->master->setup(spi);
+ if (spi->master->setup)
+ status = spi->master->setup(spi);
dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s"
"%u bits/w, %u Hz max --> %d\n",
--
1.7.1.1
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