[PATCH] arm: mach-snapdragon: pinctrl: Place pin_name in .data section

[Stephan Gerhold]

According to arch/arm/lib/crt0_64.S, the BSS section is "UNAVAILABLE"
and uninitialized before relocation. Also, it overlaps with the
appended DTB before relocation, so writing data into a variable
in the BSS section might corrupt the appended DTB.

Unfortunately, pinctrl-apq8016.c and pinctrl-apq8096.c do place the
"pin_name" variable in the BSS section (since it's uninitialized).
It's also used before relocation, when setting up the pinctrl for
the serial driver.

On DB410c this causes "GPIO_5" to be written into some part of an
appended DTB, e.g.:

80111820: edfe0dd0 9f100000 38000000 c00e0000    ...........8....
80111830: 28000000 11000000 10000000 00000000    ...(............
80111840: 4f495047 8800355f 00000000 00000000    GPIO_5..........
80111850: 00000000 00000000 01000000 00000000    ................
80111860: 03000000 04000000 00000000 02000000    ................
80111870: 03000000 04000000 0f000000 02000000    ................
80111880: 03000000 2d000000 1b000000 6c617551    .......-....Qual
80111890: 6d6d6f63 63655420 6c6f6e68 6569676f    comm Technologie

Depending on the part of the DTB that is corrupted this might not
cause any problems, but it can also result in strange reboots
without any serial output.

Fortunately, in practice this does not cause issues on DB410c yet
because board_fdt_blob_setup() in dragonboard410c.c currently
overrides the appended DTB with the one passed by the previous
bootloader (LK) (which does not get corrupted).

DB820c does not have board_fdt_blob_setup() so I would expect it to
be affected by this problem. Perhaps everyone was just fortunate to
not compile an U-Boot configuration where the pin_name corrupts an
important part of the DTB.

Make sure "pin_name" is explicitly placed in the .data section
instead of .bss to fix this.

Cc: Ramon Fried <rfried.dev at gmail.com>
Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---

 arch/arm/mach-snapdragon/pinctrl-apq8016.c | 3 +--
 arch/arm/mach-snapdragon/pinctrl-apq8096.c | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-snapdragon/pinctrl-apq8016.c b/arch/arm/mach-snapdragon/pinctrl-apq8016.c
index 1042b564c3..70c0be0bca 100644
--- a/arch/arm/mach-snapdragon/pinctrl-apq8016.c
+++ b/arch/arm/mach-snapdragon/pinctrl-apq8016.c
@@ -10,7 +10,7 @@
 #include <common.h>
 
 #define MAX_PIN_NAME_LEN 32
-static char pin_name[MAX_PIN_NAME_LEN];
+static char pin_name[MAX_PIN_NAME_LEN] __section(".data");
 static const char * const msm_pinctrl_pins[] = {
 	"SDC1_CLK",
 	"SDC1_CMD",
@@ -59,4 +59,3 @@ struct msm_pinctrl_data apq8016_data = {
 	.get_function_mux = apq8016_get_function_mux,
 	.get_pin_name = apq8016_get_pin_name,
 };
-
diff --git a/arch/arm/mach-snapdragon/pinctrl-apq8096.c b/arch/arm/mach-snapdragon/pinctrl-apq8096.c
index 20a71c319b..45462f01c2 100644
--- a/arch/arm/mach-snapdragon/pinctrl-apq8096.c
+++ b/arch/arm/mach-snapdragon/pinctrl-apq8096.c
@@ -10,7 +10,7 @@
 #include <common.h>
 
 #define MAX_PIN_NAME_LEN 32
-static char pin_name[MAX_PIN_NAME_LEN];
+static char pin_name[MAX_PIN_NAME_LEN] __section(".data");
 static const char * const msm_pinctrl_pins[] = {
 	"SDC1_CLK",
 	"SDC1_CMD",
-- 
2.32.0