This is a note to let you know that I've just added the patch titled
spi: sn-f-ospi: Fix division by zero
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-sn-f-ospi-fix-division-by-zero.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7d3a39898090d263e387db1e34397f2690245f24
Author: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
Date: Thu Feb 6 17:57:47 2025 +0900
spi: sn-f-ospi: Fix division by zero
[ Upstream commit 3588b1c0fde2f58d166e3f94a5a58d64b893526c ]
When there is no dummy cycle in the spi-nor commands, both dummy bus cycle
bytes and width are zero. Because of the cpu's warning when divided by
zero, the warning should be avoided. Return just zero to avoid such
calculations.
Fixes: 1b74dd64c861 ("spi: Add Socionext F_OSPI SPI flash controller driver")
Co-developed-by: Kohei Ito <ito.kohei@xxxxxxxxxxxxx>
Signed-off-by: Kohei Ito <ito.kohei@xxxxxxxxxxxxx>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20250206085747.3834148-1-hayashi.kunihiko@xxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/spi/spi-sn-f-ospi.c b/drivers/spi/spi-sn-f-ospi.c
index a7c3b3923b4af..fd8c8eb37d01d 100644
--- a/drivers/spi/spi-sn-f-ospi.c
+++ b/drivers/spi/spi-sn-f-ospi.c
@@ -116,6 +116,9 @@ struct f_ospi {
static u32 f_ospi_get_dummy_cycle(const struct spi_mem_op *op)
{
+ if (!op->dummy.nbytes)
+ return 0;
+
return (op->dummy.nbytes * 8) / op->dummy.buswidth;
}
