Messages in this thread Patch in this message | | | Subject | patch nozomi-fix-initialization-and-early-flow-control-access.patch added to gregkh-2.6 tree | From | <> | Date | Thu, 06 Mar 2008 13:31:47 -0800 |
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This is a note to let you know that I've just added the patch titled
Subject: nozomi: fix initialization and early flow control access
to my gregkh-2.6 tree. Its filename is
nozomi-fix-initialization-and-early-flow-control-access.patch
This tree can be found at http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
From fseidel@suse.de Thu Mar 6 13:20:29 2008 From: Frank Seidel <fseidel@suse.de> Date: Thu, 06 Mar 2008 21:45:57 +0100 Subject: nozomi: fix initialization and early flow control access To: Greg KH <greg@kroah.com>, LKML <linux-kernel@vger.kernel.org> Message-ID: <47D05805.7010003@suse.de>
From: Frank Seidel <fseidel@suse.de>
Due to some flaws in the initialization and flow control code kernel oopses could be triggered e.g. when accessing the card too early after insertion. See e.g. kernel.org bug #10077. The main part of the fix is a trivial state management making sure the card is realy ready to use before allowing any access.
Signed-off-by: Frank Seidel <fseidel@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/char/nozomi.c | 61 +++++++++++++++++++++++++++++++++++--------------- 1 file changed, 43 insertions(+), 18 deletions(-)
--- a/drivers/char/nozomi.c +++ b/drivers/char/nozomi.c @@ -190,6 +190,14 @@ enum card_type { F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */ }; +/* Initialization states a card can be in */ +enum card_state { + NOZOMI_STATE_UKNOWN = 0, + NOZOMI_STATE_ENABLED = 1, /* pci device enabled */ + NOZOMI_STATE_ALLOCATED = 2, /* config setup done */ + NOZOMI_STATE_READY = 3, /* flowcontrols received */ +}; + /* Two different toggle channels exist */ enum channel_type { CH_A = 0, @@ -385,6 +393,7 @@ struct nozomi { spinlock_t spin_mutex; /* secures access to registers and tty */ unsigned int index_start; + enum card_state state; u32 open_ttys; }; @@ -686,6 +695,7 @@ static int nozomi_read_config_table(stru dc->last_ier = dc->last_ier | CTRL_DL; writew(dc->last_ier, dc->reg_ier); + dc->state = NOZOMI_STATE_ALLOCATED; dev_info(&dc->pdev->dev, "Initialization OK!\n"); return 1; } @@ -944,6 +954,14 @@ static int receive_flow_control(struct n case CTRL_APP2: port = PORT_APP2; enable_ier = APP2_DL; + if (dc->state == NOZOMI_STATE_ALLOCATED) { + /* + * After card initialization the flow control + * received for APP2 is always the last + */ + dc->state = NOZOMI_STATE_READY; + dev_info(&dc->pdev->dev, "Device READY!\n"); + } break; default: dev_err(&dc->pdev->dev, @@ -1366,22 +1384,12 @@ static int __devinit nozomi_card_init(st dc->pdev = pdev; - /* Find out what card type it is */ - nozomi_get_card_type(dc); - ret = pci_enable_device(dc->pdev); if (ret) { dev_err(&pdev->dev, "Failed to enable PCI Device\n"); goto err_free; } - start = pci_resource_start(dc->pdev, 0); - if (start == 0) { - dev_err(&pdev->dev, "No I/O address for card detected\n"); - ret = -ENODEV; - goto err_disable_device; - } - ret = pci_request_regions(dc->pdev, NOZOMI_NAME); if (ret) { dev_err(&pdev->dev, "I/O address 0x%04x already in use\n", @@ -1389,6 +1397,16 @@ static int __devinit nozomi_card_init(st goto err_disable_device; } + start = pci_resource_start(dc->pdev, 0); + if (start == 0) { + dev_err(&pdev->dev, "No I/O address for card detected\n"); + ret = -ENODEV; + goto err_rel_regs; + } + + /* Find out what card type it is */ + nozomi_get_card_type(dc); + dc->base_addr = ioremap(start, dc->card_type); if (!dc->base_addr) { dev_err(&pdev->dev, "Unable to map card MMIO\n"); @@ -1425,6 +1443,14 @@ static int __devinit nozomi_card_init(st dc->index_start = ndev_idx * MAX_PORT; ndevs[ndev_idx] = dc; + pci_set_drvdata(pdev, dc); + + /* Enable RESET interrupt */ + dc->last_ier = RESET; + iowrite16(dc->last_ier, dc->reg_ier); + + dc->state = NOZOMI_STATE_ENABLED; + for (i = 0; i < MAX_PORT; i++) { mutex_init(&dc->port[i].tty_sem); dc->port[i].tty_open_count = 0; @@ -1433,12 +1459,6 @@ static int __devinit nozomi_card_init(st &pdev->dev); } - /* Enable RESET interrupt. */ - dc->last_ier = RESET; - writew(dc->last_ier, dc->reg_ier); - - pci_set_drvdata(pdev, dc); - return 0; err_free_sbuf: @@ -1553,7 +1573,7 @@ static int ntty_open(struct tty_struct * struct nozomi *dc = get_dc_by_tty(tty); unsigned long flags; - if (!port || !dc) + if (!port || !dc || dc->state != NOZOMI_STATE_READY) return -ENODEV; if (mutex_lock_interruptible(&port->tty_sem)) @@ -1716,6 +1736,10 @@ static int ntty_tiocmget(struct tty_stru static int ntty_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { + struct nozomi *dc = get_dc_by_tty(tty); + unsigned long flags; + + spin_lock_irqsave(&dc->spin_mutex, flags); if (set & TIOCM_RTS) set_rts(tty, 1); else if (clear & TIOCM_RTS) @@ -1725,6 +1749,7 @@ static int ntty_tiocmset(struct tty_stru set_dtr(tty, 1); else if (clear & TIOCM_DTR) set_dtr(tty, 0); + spin_unlock_irqrestore(&dc->spin_mutex, flags); return 0; } @@ -1762,7 +1787,7 @@ static int ntty_ioctl_tiocgicount(struct icount.brk = cnow.brk; icount.buf_overrun = cnow.buf_overrun; - return copy_to_user(argp, &icount, sizeof(icount)); + return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0; } static int ntty_ioctl(struct tty_struct *tty, struct file *file,
Patches currently in gregkh-2.6 which might be from fseidel@suse.de are
driver-core/nozomi-fix-initialization-and-early-flow-control-access.patch
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