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Commit b73db547 authored by Rashika Kheria's avatar Rashika Kheria Committed by Greg Kroah-Hartman
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Staging: dgrp: Refactor the function dgrp_receive() in drrp_net_ops.c 



The function dgrp_receive() in dgrp_net_ops.c is too long and can be
refactored. It uses various switch statements and goto labels. I have
removed a label called data and tried to extract a new function out of
it called as handle_data_in_packet().

This helps to make the code more modularize and simple to read and
understand.

Signed-off-by: default avatarRashika Kheria <rashika.kheria@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c79bfed6

drivers/staging/dgrp/dgrp_net_ops.c

+175 −155
Original line number Diff line number Diff line
@@ -2232,114 +2232,20 @@ static ssize_t dgrp_net_read(struct file *file, char __user *buf, size_t count, 
	return rtn;

}



/**

 * dgrp_receive() -- decode data packets received from the remote PortServer.

 * @nd: pointer to a node structure

/*

 * Common Packet Handling code

 */

static void dgrp_receive(struct nd_struct *nd)



static void handle_data_in_packet(struct nd_struct *nd, struct ch_struct *ch,

				  long dlen, long plen, int n1, u8 *dbuf)

{

	struct ch_struct *ch;

	u8 *buf;

	u8 *b;

	u8 *dbuf;

	char *error;

	long port;

	long dlen;

	long plen;

	long remain;

	long n;

	long mlast;

	long elast;

	long mstat;

	long estat;



	char ID[3];



	nd->nd_tx_time = jiffies;



	ID_TO_CHAR(nd->nd_ID, ID);

	long remain;

	u8 *buf;

	u8 *b;



	b = buf = nd->nd_iobuf;

	remain = nd->nd_remain;



	/*

	 *  Loop to process Realport protocol packets.

	 */



	while (remain > 0) {

		int n0 = b[0] >> 4;

		int n1 = b[0] & 0x0f;



		if (n0 <= 12) {

			port = (nd->nd_rx_module << 4) + n1;



			if (port >= nd->nd_chan_count) {

				error = "Improper Port Number";

				goto prot_error;

			}



			ch = nd->nd_chan + port;

		} else {

			port = -1;

			ch = NULL;

		}



		/*

		 *  Process by major packet type.

		 */



		switch (n0) {



		/*

		 *  Process 1-byte header data packet.

		 */



		case 0:

		case 1:

		case 2:

		case 3:

		case 4:

		case 5:

		case 6:

		case 7:

			dlen = n0 + 1;

			plen = dlen + 1;



			dbuf = b + 1;

			goto data;



		/*

		 *  Process 2-byte header data packet.

		 */



		case 8:

			if (remain < 3)

				goto done;



			dlen = b[1];

			plen = dlen + 2;



			dbuf = b + 2;

			goto data;



		/*

		 *  Process 3-byte header data packet.

		 */



		case 9:

			if (remain < 4)

				goto done;



			dlen = get_unaligned_be16(b + 1);

			plen = dlen + 3;



			dbuf = b + 3;



		/*

		 *  Common packet handling code.

		 */



data:

	nd->nd_tx_work = 1;



	/*
@@ -2349,7 +2255,9 @@ static void dgrp_receive(struct nd_struct *nd) 


	if (ch->ch_state < CS_READY) {

		error = "Data received before RWIN established";

				goto prot_error;

		nd->nd_remain = 0;

		nd->nd_state = NS_SEND_ERROR;

		nd->nd_error = error;

	}



	/*
@@ -2361,7 +2269,9 @@ static void dgrp_receive(struct nd_struct *nd) 


	if (dlen > n) {

		error = "Receive data overrun";

				goto prot_error;

		nd->nd_remain = 0;

		nd->nd_state = NS_SEND_ERROR;

		nd->nd_error = error;

	}



	/*
@@ -2468,7 +2378,6 @@ static void dgrp_receive(struct nd_struct *nd) 


		if ((ch->ch_flag & CH_INPUT) != 0) {

			ch->ch_flag &= ~CH_INPUT;



			wake_up_interruptible(&ch->ch_flag_wait);

		}

	}
@@ -2486,8 +2395,119 @@ static void dgrp_receive(struct nd_struct *nd) 
		put_unaligned_be16(dlen, b + 1);



		remain = 3;

				goto done;

		if (remain > 0 && b != buf)

			memcpy(buf, b, remain);



		nd->nd_remain = remain;

		return;

	}

}



/**

 * dgrp_receive() -- decode data packets received from the remote PortServer.

 * @nd: pointer to a node structure

 */

static void dgrp_receive(struct nd_struct *nd)

{

	struct ch_struct *ch;

	u8 *buf;

	u8 *b;

	u8 *dbuf;

	char *error;

	long port;

	long dlen;

	long plen;

	long remain;

	long n;

	long mlast;

	long elast;

	long mstat;

	long estat;



	char ID[3];



	nd->nd_tx_time = jiffies;



	ID_TO_CHAR(nd->nd_ID, ID);



	b = buf = nd->nd_iobuf;

	remain = nd->nd_remain;



	/*

	 *  Loop to process Realport protocol packets.

	 */



	while (remain > 0) {

		int n0 = b[0] >> 4;

		int n1 = b[0] & 0x0f;



		if (n0 <= 12) {

			port = (nd->nd_rx_module << 4) + n1;



			if (port >= nd->nd_chan_count) {

				error = "Improper Port Number";

				goto prot_error;

			}



			ch = nd->nd_chan + port;

		} else {

			port = -1;

			ch = NULL;

		}



		/*

		 *  Process by major packet type.

		 */



		switch (n0) {



		/*

		 *  Process 1-byte header data packet.

		 */



		case 0:

		case 1:

		case 2:

		case 3:

		case 4:

		case 5:

		case 6:

		case 7:

			dlen = n0 + 1;

			plen = dlen + 1;



			dbuf = b + 1;

			handle_data_in_packet(nd, ch, dlen, plen, n1, dbuf);

			break;



		/*

		 *  Process 2-byte header data packet.

		 */



		case 8:

			if (remain < 3)

				goto done;



			dlen = b[1];

			plen = dlen + 2;



			dbuf = b + 2;

			handle_data_in_packet(nd, ch, dlen, plen, n1, dbuf);

			break;



		/*

		 *  Process 3-byte header data packet.

		 */



		case 9:

			if (remain < 4)

				goto done;



			dlen = get_unaligned_be16(b + 1);

			plen = dlen + 3;



			dbuf = b + 3;



			break;



		/*