linux-kernel - [PATCH] gpiolib: fix chip->base handling in of_gpio_simple

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-next>] [day] [month] [year] [list]

Message-Id: <1342977052-7880-1-git-send-email-zonque@gmail.com>
Date:	Sun, 22 Jul 2012 19:10:52 +0200
From:	Daniel Mack <zonque@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Daniel Mack <zonque@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH] gpiolib: fix chip->base handling in of_gpio_simple_xlate()

of_gpio_simple_xlate() is called for each chip when a GPIO is looked up.
When registering several chips off the same DT node (with different pin
offsets) however, the lookup fails as the GPIO number passed in to
of_gpio_simple_xlate() is likely higher than the chip's ->ngpio value.

Fix that by taking into account the chip's ->base value, and return the
relative offset of the pin inside the chip.

Signed-off-by: Daniel Mack <zonque@...il.com>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Linus Walleij <linus.walleij@...ricsson.com>
---

I'm currently porting the PXA pieces over to DT, and stumbled over what
looks like an obvious bug to me. Correct me if I'm mistaken, but I see
no reason why one shouldn't be able to instanciate several GPIO chips
from a single DT node.

Thanks,
Daniel

 drivers/gpio/gpiolib-of.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index d18068a..51bc232 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -147,13 +147,13 @@ int of_gpio_simple_xlate(struct gpio_chip *gc,
 	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
 		return -EINVAL;

-	if (gpiospec->args[0] >= gc->ngpio)
+	if (gpiospec->args[0] >= gc->ngpio + gc->base)
 		return -EINVAL;

 	if (flags)
 		*flags = gpiospec->args[1];

-	return gpiospec->args[0];
+	return gpiospec->args[0] - gc->base;
 }
 EXPORT_SYMBOL(of_gpio_simple_xlate);

-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/