linux-kernel - [PATCH v2 6/7] spi: reduce device chip select limit again

lists.openwall.net		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 linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250915183725.219473-7-jonas.gorski@gmail.com>
Date: Mon, 15 Sep 2025 20:37:24 +0200
From: Jonas Gorski <jonas.gorski@...il.com>
To: Mark Brown <broonie@...nel.org>,
	Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
Cc: linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH v2 6/7] spi: reduce device chip select limit again

The spi chipselect limit SPI_CS_CNT_MAX was raised with commit
2f8c7c3715f2 ("spi: Raise limit on number of chip selects") from 4 to 16
to accommodate spi controllers with more than 4 chip selects, and then
later to 24 with commit 96893cdd4760 ("spi: Raise limit on number of
chip selects to 24").

Now that we removed SPI_CS_CNT_MAX limiting the chip selects of
controllers, we can reduce the amount of chip selects per device again
to 4, the original value.

Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
v1 -> v2:
* reworded and rebased onto newest changes

 include/linux/spi/spi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 49c048277e97..df4842abbc6f 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -21,7 +21,7 @@
 #include <uapi/linux/spi/spi.h>

 /* Max no. of CS supported per spi device */
-#define SPI_CS_CNT_MAX 24
+#define SPI_CS_CNT_MAX 4

 struct dma_chan;
 struct software_node;
-- 
2.43.0