diff options
| author | Mattia Dongili <malattia@linux.it> | 2012-12-20 23:21:09 +0100 |
|---|---|---|
| committer | Matthew Garrett <matthew.garrett@nebula.com> | 2013-01-07 18:32:38 +0100 |
| commit | dcbeec264d73b7228ffdfe767eab69b2353099b1 (patch) | |
| tree | 84d6c44f6f6dd5b01791c80a162d3c959224169e /drivers | |
| parent | samsung-laptop: Add quirk for broken acpi_video backlight on N250P (diff) | |
| download | linux-dcbeec264d73b7228ffdfe767eab69b2353099b1.tar.xz linux-dcbeec264d73b7228ffdfe767eab69b2353099b1.zip | |
sony-laptop: fix SNC buffer calls when SN06 returns Integers
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. This regression was introduced in 3.5.
While there also rework the return value logic to improve readability.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48671
Cc: <stable@vger.kernel.org>
Cc: Fabrizio Narni <shibotto@gmail.com>
Cc: <mus.svz@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/sony-laptop.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c index daaddec68def..b8ad71f7863f 100644 --- a/drivers/platform/x86/sony-laptop.c +++ b/drivers/platform/x86/sony-laptop.c @@ -786,28 +786,29 @@ 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)); + 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 { |