public inbox for linux-bluetooth@vger.kernel.org
 help / color / mirror / Atom feed
* [Bluez-devel] bccmd(csr_bcsp.c) bug Report
@ 2008-06-30  6:08 Chan-Yeol Park
  2008-06-30  6:15 ` Marcel Holtmann
  0 siblings, 1 reply; 4+ messages in thread
From: Chan-Yeol Park @ 2008-06-30  6:08 UTC (permalink / raw)
  To: bluez-devel


[-- Attachment #1.1: Type: text/plain, Size: 835 bytes --]

Dear all

 

Recently I found the bccmd bug.

 

I think that do_command function (csr_bcsp.c) could have a problem 

if we receive both UBCSP_PACKET_SENT and UBCSP_PACKET_RECEIVED
simultaneously from ubcsp_poll function.

 

An expected scenario is that UBCSP_PACKET_SENT comes earlier than
UBCSP_PACKET_RECEIVED.

But if we get them at the same time this could be a problem because
“sent=1” is located after checking “sent==1”.

 

It means that this program doesn’t know UBCSP_PACKET_SENT even if we
already receive it.

 

I there anyone who know this bug?

 

If you let me know how to check-in code,

I would like to do it!

 

Regards.

		

Chan-Yeol Park (박 찬 열)

Engineer

 

Mobile S/W Platform Lab. 

Telecommunication R&D Center

SAMSUNG ELECTRONICS CO., LTD.


[-- Attachment #1.2: Type: text/html, Size: 6775 bytes --]

[-- Attachment #2: csr_bcsp_modified.c --]
[-- Type: application/octet-stream, Size: 1939 bytes --]

static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
	unsigned char cp[254], rp[254];
	uint8_t cmd[10];
	uint16_t size;
	uint8_t delay, activity = 0x00;
	int timeout = 0, sent = 0;

	size = (length < 8) ? 9 : ((length + 1) / 2) + 5;

	cmd[0] = command & 0xff;
	cmd[1] = command >> 8;
	cmd[2] = size & 0xff;
	cmd[3] = size >> 8;
	cmd[4] = seqnum & 0xff;
	cmd[5] = seqnum >> 8;
	cmd[6] = varid & 0xff;
	cmd[7] = varid >> 8;
	cmd[8] = 0x00;
	cmd[9] = 0x00;

	memset(cp, 0, sizeof(cp));
	cp[0] = 0x00;
	cp[1] = 0xfc;
	cp[2] = (size * 2) + 1;
	cp[3] = 0xc2;
	memcpy(cp + 4, cmd, sizeof(cmd));
	memcpy(cp + 14, value, length);

	receive_packet.length = 512;
	ubcsp_receive_packet(&receive_packet);

	send_packet.channel  = 5;
	send_packet.reliable = 1;
	send_packet.length   = (size * 2) + 4;
	memcpy(send_packet.payload, cp, (size * 2) + 4);

	ubcsp_send_packet(&send_packet);

	while (1) {
		delay = ubcsp_poll(&activity);

		if (activity & UBCSP_PACKET_SENT) {
			switch (varid) {
			case CSR_VARID_COLD_RESET:
			case CSR_VARID_WARM_RESET:
			case CSR_VARID_COLD_HALT:
			case CSR_VARID_WARM_HALT:
				return 0;
			}

			sent = 1;
			timeout = 0;
		}

		if (activity & UBCSP_PACKET_RECEIVED) {
			if (sent && receive_packet.channel == 5 &&
					receive_packet.payload[0] == 0xff) {
				memcpy(rp, receive_packet.payload,
							receive_packet.length);
				break;
			}

			receive_packet.length = 512;
			ubcsp_receive_packet(&receive_packet);
			timeout = 0;
		}

		if (delay) {
			usleep(delay * 100);

			if (timeout++ > 100) {
				fprintf(stderr, "Operation timed out\n");
				return -1;
			}
		}
	}

	if (rp[0] != 0xff || rp[2] != 0xc2) {
		errno = EIO;
		return -1;
	}

	if ((rp[11] + (rp[12] << 8)) != 0) {
		errno = ENXIO;
		return -1;
	}

	memcpy(value, rp + 13, length);

	return 0;
}

[-- Attachment #3: csr_bcsp_original.c --]
[-- Type: application/octet-stream, Size: 1941 bytes --]


static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
	unsigned char cp[254], rp[254];
	uint8_t cmd[10];
	uint16_t size;
	uint8_t delay, activity = 0x00;
	int timeout = 0, sent = 0;

	size = (length < 8) ? 9 : ((length + 1) / 2) + 5;

	cmd[0] = command & 0xff;
	cmd[1] = command >> 8;
	cmd[2] = size & 0xff;
	cmd[3] = size >> 8;
	cmd[4] = seqnum & 0xff;
	cmd[5] = seqnum >> 8;
	cmd[6] = varid & 0xff;
	cmd[7] = varid >> 8;
	cmd[8] = 0x00;
	cmd[9] = 0x00;

	memset(cp, 0, sizeof(cp));
	cp[0] = 0x00;
	cp[1] = 0xfc;
	cp[2] = (size * 2) + 1;
	cp[3] = 0xc2;
	memcpy(cp + 4, cmd, sizeof(cmd));
	memcpy(cp + 14, value, length);

	receive_packet.length = 512;
	ubcsp_receive_packet(&receive_packet);

	send_packet.channel  = 5;
	send_packet.reliable = 1;
	send_packet.length   = (size * 2) + 4;
	memcpy(send_packet.payload, cp, (size * 2) + 4);

	ubcsp_send_packet(&send_packet);

	while (1) {
		delay = ubcsp_poll(&activity);

		if (activity & UBCSP_PACKET_RECEIVED) {
			if (sent && receive_packet.channel == 5 &&
					receive_packet.payload[0] == 0xff) {
				memcpy(rp, receive_packet.payload,
							receive_packet.length);
				break;
			}

			receive_packet.length = 512;
			ubcsp_receive_packet(&receive_packet);
			timeout = 0;
		}

		if (activity & UBCSP_PACKET_SENT) {
			switch (varid) {
			case CSR_VARID_COLD_RESET:
			case CSR_VARID_WARM_RESET:
			case CSR_VARID_COLD_HALT:
			case CSR_VARID_WARM_HALT:
				return 0;
			}

			sent = 1;
			timeout = 0;
		}

		if (delay) {
			usleep(delay * 100);

			if (timeout++ > 100) {
				fprintf(stderr, "Operation timed out\n");
				return -1;
			}
		}
	}

	if (rp[0] != 0xff || rp[2] != 0xc2) {
		errno = EIO;
		return -1;
	}

	if ((rp[11] + (rp[12] << 8)) != 0) {
		errno = ENXIO;
		return -1;
	}

	memcpy(value, rp + 13, length);

	return 0;
}

[-- Attachment #4: Type: text/plain, Size: 247 bytes --]

-------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It's the best place to buy or sell services for
just about anything Open Source.
http://sourceforge.net/services/buy/index.php

[-- Attachment #5: Type: text/plain, Size: 164 bytes --]

_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-07-11  6:49 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2008-06-30  6:08 [Bluez-devel] bccmd(csr_bcsp.c) bug Report Chan-Yeol Park
2008-06-30  6:15 ` Marcel Holtmann
2008-07-02 18:47   ` Frank Mandarino
2008-07-11  6:49     ` Marcel Holtmann

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox