From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mattia Dongili Subject: [PATCH] sony-laptop: fix SNC buffer calls when SN06 returns Integers Date: Sun, 28 Oct 2012 09:05:50 +0900 Message-ID: <1351382750-712-1-git-send-email-malattia@linux.it> Return-path: Received: from ac250205.ppp.asahi-net.or.jp ([183.77.250.205]:33468 "EHLO smtp.kamineko.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752528Ab2J1AGE (ORCPT ); Sat, 27 Oct 2012 20:06:04 -0400 Sender: platform-driver-x86-owner@vger.kernel.org List-ID: To: Matthew Garrett Cc: platform-driver-x86@vger.kernel.org, Mattia Dongili , Fabrizio Narni , mus.svz@gmail.com SN06 in some cases returns an Integer instead of a buffer. While the code handling the return value was trying to cope with the difference, the memcpy call was not making any difference between the two types of acpi_object union. While there also rework the return value logic to improve readability. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48671 Cc: Fabrizio Narni Cc: Signed-off-by: Mattia Dongili --- drivers/platform/x86/sony-laptop.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c index 42125df..a58e0dd 100644 --- a/drivers/platform/x86/sony-laptop.c +++ b/drivers/platform/x86/sony-laptop.c @@ -904,28 +904,34 @@ static int sony_nc_int_call(acpi_handle handle, char *name, int *value, static int sony_nc_buffer_call(acpi_handle handle, char *name, u64 *value, void *buffer, size_t buflen) { + int ret = 0; size_t len = len; union acpi_object *object = __call_snc_method(handle, name, value); if (!object) return -EINVAL; - if (object->type == ACPI_TYPE_BUFFER) + if (object->type == ACPI_TYPE_BUFFER) { len = MIN(buflen, object->buffer.length); + memcpy(buffer, object->buffer.pointer, len); - else if (object->type == ACPI_TYPE_INTEGER) + } else if (object->type == ACPI_TYPE_INTEGER) { len = MIN(buflen, sizeof(object->integer.value)); + dprintk("%s call returned an Integer (0x%.8x%.8x len:%zu)\n", + name, + (unsigned int)(object->integer.value >> 32), + (unsigned int)object->integer.value & 0xffffffff, + len); + memcpy(buffer, &object->integer.value, len); - else { + } else { pr_warn("Invalid acpi_object: expected 0x%x got 0x%x\n", ACPI_TYPE_BUFFER, object->type); - kfree(object); - return -EINVAL; + ret = -EINVAL; } - memcpy(buffer, object->buffer.pointer, len); kfree(object); - return 0; + return ret; } struct sony_nc_handles { -- 1.7.10.4