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[Qemu-devel] [PATCH 3/5] atapi: GESN: Spin off No Event Available handli
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PATCH 3/5] atapi: GESN: Spin off No Event Available handling into own function |
Date: |
Fri, 8 Apr 2011 12:45:17 +0530 |
Handle GET_EVENT_STATUS_NOTIFICATION's No Event Available status in its
own function.
Also ensure the buffer the driver sent us is big enough to fill in all
the data we have -- else just fill in as much as the buffer can hold.
Signed-off-by: Amit Shah <address@hidden>
---
hw/ide/core.c | 42 ++++++++++++++++++++++++++++++++++++------
1 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index c4a5a13..730587e 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1084,14 +1084,45 @@ static int ide_dvd_read_structure(IDEState *s, int
format,
}
}
+static unsigned int event_status_nea(uint8_t *buf, unsigned int max_len)
+{
+ unsigned int used_len;
+
+ /*
+ * Ensure we don't write on memory we don't have.
+ * max_len of 0 should not produce an error as well.
+ */
+ used_len = 0;
+
+ /* No event descriptor returned */
+ if (max_len > 0) {
+ buf[0] = 0;
+ used_len++;
+ }
+ if (max_len > 1) {
+ buf[1] = 0;
+ used_len++;
+ }
+ if (max_len > 2) {
+ buf[2] = 0x80; /* No Event Available (NEA) */
+ used_len++;
+ }
+ if (max_len > 3) {
+ buf[3] = 0x00; /* Empty supported event classes */
+ used_len++;
+ }
+ return used_len;
+}
+
static void handle_get_event_status_notification(IDEState *s,
uint8_t *buf,
const uint8_t *packet)
{
- unsigned int max_len;
+ unsigned int max_len, used_len;
max_len = ube16_to_cpu(packet + 7);
+ /* It is fine by the MMC spec to not support async mode operations */
if (!(packet[1] & 0x01)) { /* asynchronous mode */
/* Only polling is supported, asynchronous mode is not. */
ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
@@ -1099,12 +1130,11 @@ static void
handle_get_event_status_notification(IDEState *s,
return;
}
- /* polling */
+ /* polling mode operation */
+
/* We don't support any event class (yet). */
- cpu_to_ube16(buf, 0x00); /* No event descriptor returned */
- buf[2] = 0x80; /* No Event Available (NEA) */
- buf[3] = 0x00; /* Empty supported event classes */
- ide_atapi_cmd_reply(s, 4, max_len);
+ used_len = event_status_nea(buf, max_len);
+ ide_atapi_cmd_reply(s, used_len, max_len);
}
static void ide_atapi_cmd(IDEState *s)
--
1.7.4.2