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Staging: quickstart: Cleanup quickstart_acpi_ghid 

Also fix memory leak (buffer.pointer) when returned buffer of length
less than 8.

Signed-off-by: Szymon Janc <szymon@janc.net.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Szymon Janc 2012-01-11 23:22:40 +01:00 committed by Greg Kroah-Hartman
parent 1692caa949
commit 2ac16967b8
1 changed files with 26 additions and 12 deletions
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38
drivers/staging/quickstart/quickstart.c
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@ -191,14 +191,11 @@ static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
return;
}
static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
uint32_t usageid = 0;
if (!quickstart)
return;
int ret = 0;
/*
* This returns a buffer telling the button usage ID,
@ -206,24 +203,41 @@ static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
*/
status = acpi_evaluate_object(quickstart->device->handle, "GHID", NULL,
&buffer);
if (ACPI_FAILURE(status) || !buffer.pointer) {
if (ACPI_FAILURE(status)) {
printk(KERN_ERR "quickstart: %s GHID method failed.\n",
quickstart->btn->name);
return;
return -EINVAL;
}
if (buffer.length < 8)
return;
/*
* <<The GHID method can return a BYTE, WORD, or DWORD.
* The value must be encoded in little-endian byte
* order (least significant byte first).>>
*/
usageid = *((uint32_t *)(buffer.pointer + (buffer.length - 8)));
quickstart->btn->id = usageid;
switch (buffer.length) {
case 1:
quickstart->btn->id = *(uint8_t *)buffer.pointer;
break;
case 2:
quickstart->btn->id = *(uint16_t *)buffer.pointer;
break;
case 4:
quickstart->btn->id = *(uint32_t *)buffer.pointer;
break;
case 8:
quickstart->btn->id = *(uint64_t *)buffer.pointer;
break;
default:
printk(KERN_ERR "quickstart: %s GHID method returned buffer "
"of unexpected length %u\n",
quickstart->btn->name, buffer.length);
ret = -EINVAL;
break;
}
kfree(buffer.pointer);
return ret;
}
static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid)