Re: [ patch 5/7] drivers/serial/jsm: new serial device driver

From: Wen Xiong
Date: Sat Mar 05 2005 - 00:32:25 EST

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Jeff Garzik wrote:

Wen Xiong wrote:

+/* Our "in use" variables, to enforce 1 open only */
+static int jsm_mgmt_in_use[MAXMGMTDEVICES];

Eliminate MAXMGMTDEVICES

+
+/*
+ * jsm_mgmt_open() + *
+ * Open the mgmt/downld/dpa device
+ */ +int jsm_mgmt_open(struct inode *inode, struct file *file)
+{
+ unsigned long lock_flags;
+ unsigned int minor = JSM_MINOR(inode);
+
+ DPR_MGMT(("jsm_mgmt_open start.\n"));
+
+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ /* mgmt device */
+ if (minor < MAXMGMTDEVICES) {
+ /* Only allow 1 open at a time on mgmt device */
+ if (jsm_mgmt_in_use[minor]) {
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+ return -EBUSY;
+ }
+ jsm_mgmt_in_use[minor]++;

An interruptible sleep (semaphore?) is usually preferred to EBUSY.

+ else {
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+ return -ENXIO;
+ }
+
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPR_MGMT(("jsm_mgmt_open finish.\n"));
+
+ return 0;
+}
+
+/*
+ * jsm_mgmt_close()
+ *
+ * Open the mgmt/dpa device
+ */ +int jsm_mgmt_close(struct inode *inode, struct file *file)
+{
+ unsigned long lock_flags;
+ unsigned int minor = JSM_MINOR(inode);
+
+ DPR_MGMT(("jsm_mgmt_close start.\n"));
+
+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ /* mgmt device */
+ if (minor < MAXMGMTDEVICES) {
+ if (jsm_mgmt_in_use[minor])
+ jsm_mgmt_in_use[minor] = 0;
+ }
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPR_MGMT(("jsm_mgmt_close finish.\n"));
+
+ return 0;
+}
+
+/*
+ * jsm_mgmt_ioctl()
+ *
+ * ioctl the mgmt/dpa device
+ */ +
+int jsm_mgmt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ unsigned long lock_flags;
+ void __user *uarg = (void __user *) arg;
+
+ DPR_MGMT(("jsm_mgmt_ioctl start.\n"));
+
+ switch (cmd) {
+
+ case DIGI_GETDD:
+ {
+ /*
+ * This returns the total number of boards
+ * in the system, as well as driver version
+ * and has space for a reserved entry
+ */
+ struct digi_dinfo ddi;

stack usage

+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ ddi.dinfo_nboards = jsm_NumBoards;
+ sprintf(ddi.dinfo_version, "%s", "40002438_A-INKERNEL");
+
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPR_MGMT(("DIGI_GETDD returning numboards: %d version: %s\n",
+ ddi.dinfo_nboards, ddi.dinfo_version));
+
+ if (copy_to_user(uarg, &ddi, sizeof (ddi)))
+ return -EFAULT;
+
+ break;
+ }
+
+ case DIGI_GETBD:
+ {
+ int brd;
+
+ struct digi_info di;

ditto

+ if (copy_from_user(&brd, uarg, sizeof(int)))
+ return -EFAULT;
+
+ DPR_MGMT(("DIGI_GETBD asking about board: %d\n", brd));
+
+ if ((brd < 0) || (brd > jsm_NumBoards) || (jsm_NumBoards == 0))
+ return -ENODEV;
+
+ memset(&di, 0, sizeof(di));
+
+ di.info_bdnum = brd;
+
+ spin_lock_irqsave(&jsm_Board[brd]->bd_lock, lock_flags);
+
+ di.info_bdtype = jsm_Board[brd]->dpatype;
+ di.info_bdstate = jsm_Board[brd]->dpastatus;
+ di.info_ioport = 0;
+ di.info_physaddr = (ulong) jsm_Board[brd]->membase;
+ di.info_physsize = (ulong) jsm_Board[brd]->membase - jsm_Board[brd]->membase_end;
+ if (jsm_Board[brd]->state != BOARD_FAILED)
+ di.info_nports = jsm_Board[brd]->nasync;
+ else
+ di.info_nports = 0;
+
+ spin_unlock_irqrestore(&jsm_Board[brd]->bd_lock, lock_flags);
+
+ DPR_MGMT(("DIGI_GETBD returning type: %x state: %x ports: %x size: %x\n",
+ di.info_bdtype, di.info_bdstate, di.info_nports, di.info_physsize));
+
+ if (copy_to_user(uarg, &di, sizeof (di)))
+ return -EFAULT;
+
+ break;
+ }
+
+ case DIGI_GET_NI_INFO:
+ {
+ struct channel_t *ch;
+ struct ni_info ni;
+ ulong lock_flags;
+ uchar mstat = 0;
+ uint board = 0;
+ uint channel = 0;
+
+ if (copy_from_user(&ni, uarg, sizeof(struct ni_info)))
+ return -EFAULT;
+
+ DPR_MGMT(("DIGI_GETBD asking about board: %d channel: %d\n",
+ ni.board, ni.channel));
+
+ board = ni.board;
+ channel = ni.channel;
+
+ /* Verify boundaries on board */
+ if ((board < 0) || (board > jsm_NumBoards) || (jsm_NumBoards == 0))
+ return -ENODEV;
+
+ /* Verify boundaries on channel */
+ if ((channel < 0) || (channel > jsm_Board[board]->nasync))
+ return -ENODEV;
+
+ ch = jsm_Board[board]->channels[channel];
+
+ if (!ch || ch->magic != JSM_CHANNEL_MAGIC)
+ return -ENODEV;
+
+ memset(&ni, 0, sizeof(ni));
+ ni.board = board;
+ ni.channel = channel;
+
+ spin_lock_irqsave(&ch->ch_lock, lock_flags);
+
+ mstat = (ch->ch_mostat | ch->ch_mistat);
+
+ if (mstat & UART_MCR_DTR) {
+ ni.mstat |= TIOCM_DTR;
+ ni.dtr = TIOCM_DTR;
+ }
+ if (mstat & UART_MCR_RTS) {
+ ni.mstat |= TIOCM_RTS;
+ ni.rts = TIOCM_RTS;
+ }
+ if (mstat & UART_MSR_CTS) {
+ ni.mstat |= TIOCM_CTS;
+ ni.cts = TIOCM_CTS;
+ }
+ if (mstat & UART_MSR_RI) {
+ ni.mstat |= TIOCM_RI;
+ ni.ri = TIOCM_RI;
+ }
+ if (mstat & UART_MSR_DCD) {
+ ni.mstat |= TIOCM_CD;
+ ni.dcd = TIOCM_CD;
+ }
+ if (mstat & UART_MSR_DSR)
+ ni.mstat |= TIOCM_DSR;
+
+ ni.iflag = ch->ch_c_iflag;
+ ni.oflag = ch->ch_c_oflag;
+ ni.cflag = ch->ch_c_cflag;
+ ni.lflag = ch->ch_c_lflag;
+
+ if (ch->ch_flags & CH_STOPI)
+ ni.recv_stopped = 1;
+ else
+ ni.recv_stopped = 0;
+
+ if (ch->ch_flags & CH_STOP)
+ ni.xmit_stopped = 1;
+ else
+ ni.xmit_stopped = 0;
+
+ ni.curtx = ch->ch_txcount;
+ ni.currx = ch->ch_rxcount;
+
+ ni.baud = ch->ch_old_baud;
+
+ spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+
+ if (copy_to_user(uarg, &ni, sizeof(ni)))
+ return -EFAULT;
+
+ break;
+ }
+
+ }
+
+ DPR_MGMT(("jsm_mgmt_ioctl finish.\n"));
+
+ return 0;
+}

Fixed the stack issues. Let me know if this way doesn't work. Thanks,

Signed-off-by: Wen Xiong <wendyx@xxxxxxxxxxxxxxxxxxxxxxx>

diff -Nuar linux-2.6.11.org/drivers/serial/jsm/jsm_mgmt.c linux-2.6.11.new/drivers/serial/jsm/jsm_mgmt.c
--- linux-2.6.11.org/drivers/serial/jsm/jsm_mgmt.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.11.new/drivers/serial/jsm/jsm_mgmt.c 2005-03-04 11:28:39.420979504 -0600
@@ -0,0 +1,336 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@xxxxxxxx>
+ * Wendy Xiong <wendyx@xxxxxxxxxxxxxxxxxxxxxxx>
+ *
+ ***********************************************************************/
+
+/************************************************************************
+ *
+ * This file implements the mgmt functionality for the
+ * Neo and ClassicBoard based product lines.
+ *
+ ************************************************************************
+ */
+#include <linux/ctype.h>
+#include <linux/sched.h> /* For jiffies, task states */
+#include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */
+#include <linux/termios.h>
+#include <asm/uaccess.h> /* For copy_from_user/copy_to_user */
+
+#include "jsm_driver.h"
+
+/* Our "in use" variables, to enforce 1 open only */
+static int jsm_mgmt_in_use[8];
+spinlock_t jsm_global_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ * jsm_mgmt_open()
+ *
+ * Open the mgmt/downld/dpa device
+ */
+int jsm_mgmt_open(struct inode *inode, struct file *file)
+{
+ unsigned long lock_flags;
+ unsigned int minor = JSM_MINOR(inode);
+
+ DPRINTK(MGMT, INFO, "start.\n");
+
+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ /* mgmt device */
+ if (minor < 8) {
+ /* Only allow 1 open at a time on mgmt device */
+ if (jsm_mgmt_in_use[minor]) {
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+ return -EBUSY;
+ }
+ jsm_mgmt_in_use[minor]++;
+ }
+ else {
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+ return -ENXIO;
+ }
+
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPRINTK(MGMT, INFO, "finish.\n");
+
+ return 0;
+}
+
+/*
+ * jsm_mgmt_close()
+ *
+ * Open the mgmt/dpa device
+ */
+int jsm_mgmt_close(struct inode *inode, struct file *file)
+{
+ unsigned long lock_flags;
+ unsigned int minor = JSM_MINOR(inode);
+
+ DPRINTK(MGMT, INFO, "start.\n");
+
+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ /* mgmt device */
+ if (minor < 8) {
+ if (jsm_mgmt_in_use[minor])
+ jsm_mgmt_in_use[minor] = 0;
+ }
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPRINTK(MGMT, INFO, "finish.\n");
+
+ return 0;
+}
+
+/*
+ * jsm_mgmt_ioctl()
+ *
+ * ioctl the mgmt/dpa device
+ */
+
+int jsm_mgmt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ unsigned long lock_flags;
+ void __user *uarg = (void __user *) arg;
+
+ DPRINTK(MGMT, INFO, "start.\n");
+
+ switch (cmd) {
+
+ case DIGI_GETDD:
+ {
+ /*
+ * This returns the total number of boards
+ * in the system, as well as driver version
+ * and has space for a reserved entry
+ */
+ struct digi_dinfo *ddi;
+ int adapter_count;
+
+ ddi = (struct digi_dinfo *)kmalloc(sizeof(struct digi_dinfo), GFP_KERNEL);
+ if (!ddi) {
+ DPRINTK(MGMT, WARNING, "memory allocation for board structure failed\n");
+ return -ENOMEM;
+ }
+ memset(ddi, 0, sizeof(struct digi_dinfo));
+
+
+ adapter_count = get_jsm_board_number();
+
+ spin_lock_irqsave(&jsm_global_lock, lock_flags);
+
+ ddi->dinfo_nboards = adapter_count;
+ sprintf(ddi->dinfo_version, "%s", "40002438_A-INKERNEL");
+
+ spin_unlock_irqrestore(&jsm_global_lock, lock_flags);
+
+ DPRINTK(MGMT, INFO, "DIGI_GETDD returning numboards: %d version: %s\n",
+ ddi->dinfo_nboards, ddi->dinfo_version);
+
+ if (copy_to_user(uarg, &ddi, sizeof (struct digi_dinfo)))
+ return -EFAULT;
+
+ kfree(ddi);
+ break;
+ }
+
+ case DIGI_GETBD:
+ {
+ int brd;
+
+ struct digi_info *di;
+ int adapter_count;
+
+ struct list_head *tmp;
+ struct jsm_board *cur_board_entry;
+
+ if (copy_from_user(&brd, uarg, sizeof(int)))
+ return -EFAULT;
+
+ adapter_count = get_jsm_board_number();
+
+ DPRINTK(MGMT, INFO, "DIGI_GETBD asking about board: %d\n", brd);
+
+ if ((brd < 0) || (brd > adapter_count) || (adapter_count == 0))
+ return -ENODEV;
+
+ di = (struct digi_info *)kmalloc(sizeof(struct digi_info), GFP_KERNEL);
+ if (!di) {
+ DPRINTK(MGMT, WARNING, "memory allocation for board structure failed\n");
+ return -ENOMEM;
+ }
+ memset(di, 0, sizeof(struct digi_info));
+
+ di->info_bdnum = brd;
+
+ spin_lock_irqsave(&jsm_board_head_lock, lock_flags);
+ list_for_each(tmp, &jsm_board_head) {
+ cur_board_entry = list_entry(tmp, struct jsm_board,
+ jsm_board_entry);
+ if (cur_board_entry->boardnum == brd) {
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
+
+
+ spin_lock_irqsave(&cur_board_entry->bd_lock, lock_flags);
+
+ di->info_bdtype = cur_board_entry->dpatype;
+ di->info_bdstate = cur_board_entry->dpastatus;
+ di->info_ioport = 0;
+ di->info_physaddr = (u64) cur_board_entry->membase;
+ di->info_physsize = (u64) cur_board_entry->membase - cur_board_entry->membase_end;
+ if (cur_board_entry->state != BOARD_FAILED)
+ di->info_nports = cur_board_entry->nasync;
+ else
+ di->info_nports = 0;
+
+ spin_unlock_irqrestore(&cur_board_entry->bd_lock, lock_flags);
+
+ DPRINTK(MGMT, INFO, "DIGI_GETBD returning type: %x state: %x ports: %x size: %x\n",
+ di->info_bdtype, di->info_bdstate, di->info_nports, di->info_physsize);
+
+ if (copy_to_user(uarg, &di, sizeof (struct digi_info)))
+ return -EFAULT;
+
+ kfree(di);
+ break;
+ }
+
+ case DIGI_GET_NI_INFO:
+ {
+ struct jsm_channel *ch;
+ struct ni_info *ni;
+ u64 lock_flags;
+ u8 mstat = 0;
+ u32 board = 0;
+ u32 channel = 0;
+ int adapter_count = 0;
+ struct list_head *tmp;
+ struct jsm_board *cur_board_entry;
+
+ adapter_count = get_jsm_board_number();
+ ni = (struct ni_info *)kmalloc(sizeof(struct ni_info), GFP_KERNEL);
+ if (!ni) {
+ DPRINTK(MGMT, WARNING, "memory allocation for board structure failed\n");
+ return -ENOMEM;
+ }
+ memset(ni, 0, sizeof(struct ni_info));
+
+ if (copy_from_user(&ni, uarg, sizeof(struct ni_info)))
+ return -EFAULT;
+
+ DPRINTK(MGMT, INFO, "DIGI_GETBD asking about board: %d channel: %d\n",
+ ni->board, ni->channel);
+
+ board = ni->board;
+ channel = ni->channel;
+
+ /* Verify boundaries on board */
+ if ((board < 0) || (board > adapter_count) || (adapter_count == 0))
+ return -ENODEV;
+
+ spin_lock_irqsave(&jsm_board_head_lock, lock_flags);
+ list_for_each(tmp, &jsm_board_head) {
+ cur_board_entry = list_entry(tmp, struct jsm_board,
+ jsm_board_entry);
+ if (cur_board_entry->boardnum == board) {
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
+
+ /* Verify boundaries on channel */
+ if ((channel < 0) || (channel > cur_board_entry->nasync))
+ return -ENODEV;
+
+ ch = cur_board_entry->channels[channel];
+
+ memset(&ni, 0, sizeof(struct ni_info));
+ ni->board = board;
+ ni->channel = channel;
+
+ spin_lock_irqsave(&ch->ch_lock, lock_flags);
+
+ mstat = (ch->ch_mostat | ch->ch_mistat);
+
+ if (mstat & UART_MCR_DTR) {
+ ni->mstat |= TIOCM_DTR;
+ ni->dtr = TIOCM_DTR;
+ }
+ if (mstat & UART_MCR_RTS) {
+ ni->mstat |= TIOCM_RTS;
+ ni->rts = TIOCM_RTS;
+ }
+ if (mstat & UART_MSR_CTS) {
+ ni->mstat |= TIOCM_CTS;
+ ni->cts = TIOCM_CTS;
+ }
+ if (mstat & UART_MSR_RI) {
+ ni->mstat |= TIOCM_RI;
+ ni->ri = TIOCM_RI;
+ }
+ if (mstat & UART_MSR_DCD) {
+ ni->mstat |= TIOCM_CD;
+ ni->dcd = TIOCM_CD;
+ }
+ if (mstat & UART_MSR_DSR)
+ ni->mstat |= TIOCM_DSR;
+
+ ni->iflag = ch->ch_c_iflag;
+ ni->oflag = ch->ch_c_oflag;
+ ni->cflag = ch->ch_c_cflag;
+ ni->lflag = ch->ch_c_lflag;
+
+ if (ch->ch_flags & CH_STOPI)
+ ni->recv_stopped = 1;
+ else
+ ni->recv_stopped = 0;
+
+ if (ch->ch_flags & CH_STOP)
+ ni->xmit_stopped = 1;
+ else
+ ni->xmit_stopped = 0;
+
+ ni->curtx = ch->ch_txcount;
+ ni->currx = ch->ch_rxcount;
+
+ ni->baud = ch->ch_old_baud;
+
+ spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+
+ if (copy_to_user(uarg, &ni, sizeof(ni)))
+ return -EFAULT;
+
+ break;
+ }
+
+ }
+
+ DPRINTK(MGMT, INFO, "finish.\n");
+
+ return 0;
+}

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