lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 20 Nov 2020 22:34:14 +0100
From:   Lars Povlsen <>
To:     Serge Semin <>,
        Mark Brown <>, <>
CC:     Lars Povlsen <>,
Subject: [PATCH] spi: dw: Fix spi registration for controllers overriding CS

When SPI DW memory ops support was introduced, there was a check for
excluding controllers which supplied their own CS function. Even so,
the mem_ops pointer is *always* presented to the SPI core.

This causes the SPI core sanity check in spi_controller_check_ops() to
refuse registration, since a mem_ops pointer is being supplied without
an exec_op member function.

The end result is failure of the SPI DW driver on sparx5 and similar

The fix in the core SPI DW driver is to avoid presenting the mem_ops
pointer if the exec_op function is not set.

Fixes: 6423207e57ea (spi: dw: Add memory operations support)
Signed-off-by: Lars Povlsen <>
 drivers/spi/spi-dw-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 2e50cc0a9291..a0794eac2094 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -875,7 +875,8 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 		master->set_cs = dw_spi_set_cs;
 	master->transfer_one = dw_spi_transfer_one;
 	master->handle_err = dw_spi_handle_err;
-	master->mem_ops = &dws->mem_ops;
+	if (dws->mem_ops.exec_op)
+		master->mem_ops = &dws->mem_ops;
 	master->max_speed_hz = dws->max_freq;
 	master->dev.of_node = dev->of_node;
 	master->dev.fwnode = dev->fwnode;

Powered by blists - more mailing lists