linux-kernel - [PATCH] ACPI: EC: Check if boot

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Message-ID: <46D7A196.7070309@suse.de>
Date:	Fri, 31 Aug 2007 09:05:26 +0400
From:	Alexey Starikovskiy <astarikovskiy@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Daniel Ritz <daniel.ritz-ml@...ssonline.ch>,
	Luca Tettamanti <kronos.it@...il.com>,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] ACPI: EC: Check if boot_ec was really found in DSDT

From: Alexey Starikovskiy <astarikovskiy@...e.de>

acpi_get_devices() returns success if it did not find any device.
We have to check for this case.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
---

 drivers/acpi/ec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 43749c8..3f7935a 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -886,7 +886,8 @@ int __init acpi_ec_ecdt_probe(void)
         printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
         status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
                         boot_ec, NULL);
-        if (ACPI_FAILURE(status))
+        /* Check that acpi_get_devices actually find something */
+        if (ACPI_FAILURE(status) || !boot_ec->handle)
             goto error;
     }
 

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