Hi Pelle, Just some minor nitpicks. On 04/13/2015 07:08 AM, Pelle Nilsson wrote: > spi-altera doesn't register this callback, and doesn't have a need for it, > but currently causes a NULL dereference when callback is called. This commit needs a Signed-off-by tag. Also, maybe you can avoid talking about spi-altera in the commit, since this change is not related to it. Instead you can explain that some SPI controllers don't register the callback (e.g. spi-altera) and so this commit makes it optional to prevent a NULL dereference. You explained in the cover that you are fixing commit 30af9b558a56 so you probably want to add a Fixes tag (Documentation/SubmittingPatches explains this procedure). The stable team will use the Fixes tag to backport the change if needed. > --- > drivers/spi/spi-bitbang.c | 13 ++++++++----- > 1 file changed, 8 insertions(+), 5 deletions(-) > > diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c > index 5ef6638..d02057d 100644 > --- a/drivers/spi/spi-bitbang.c > +++ b/drivers/spi/spi-bitbang.c > @@ -180,7 +180,7 @@ int spi_bitbang_setup(struct spi_device *spi) > { > struct spi_bitbang_cs *cs = spi->controller_state; > struct spi_bitbang *bitbang; > - int retval; > + int retval = 0; > unsigned long flags; > > bitbang = spi_master_get_devdata(spi->master); > @@ -197,7 +197,8 @@ int spi_bitbang_setup(struct spi_device *spi) > if (!cs->txrx_word) > return -EINVAL; > > - retval = bitbang->setup_transfer(spi, NULL); > + if (bitbang->setup_transfer) retval is only used in this scope, so you can declare it only here: if (bitbang->setup_transfer) { int retval = bitbang->setup_transfer(spi, NULL); if (retval < 0) return retval; } > + retval = bitbang->setup_transfer(spi, NULL); > if (retval < 0) > return retval; > > @@ -295,9 +296,11 @@ static int spi_bitbang_transfer_one(struct spi_master *master, > > /* init (-1) or override (1) transfer params */ > if (do_setup != 0) { > - status = bitbang->setup_transfer(spi, t); > - if (status < 0) > - break; > + if (bitbang->setup_transfer) { > + status = bitbang->setup_transfer(spi, t); > + if (status < 0) > + break; > + } > if (do_setup == -1) > do_setup = 0; > } > Other than that, the commit looks good. -- Ezequiel Garcia, VanguardiaSur www.vanguardiasur.com.ar -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html