[PATCH] Char: stallion, implement fail paths

This driver expect everything to work.  Implement fail paths logic to release
regions, irq hangler, memory...  if something is in bad state.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index bc29113..24bdb48 100644 (file)
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -779,7 +779,8 @@ static void __init stl_argbrds(void)
                brdp->ioaddr2 = conf.ioaddr2;
                brdp->irq = conf.irq;
                brdp->irqtype = conf.irqtype;
-               stl_brdinit(brdp);
+               if (stl_brdinit(brdp))
+                       kfree(brdp);
        }
 }
 
@@ -1965,6 +1966,29 @@ static int __init stl_initports(struct stlbrd *brdp, struct stlpanel *panelp)
        return(0);
 }
 
+static void stl_cleanup_panels(struct stlbrd *brdp)
+{
+       struct stlpanel *panelp;
+       struct stlport *portp;
+       unsigned int j, k;
+
+       for (j = 0; j < STL_MAXPANELS; j++) {
+               panelp = brdp->panels[j];
+               if (panelp == NULL)
+                       continue;
+               for (k = 0; k < STL_PORTSPERPANEL; k++) {
+                       portp = panelp->ports[k];
+                       if (portp == NULL)
+                               continue;
+                       if (portp->tty != NULL)
+                               stl_hangup(portp->tty);
+                       kfree(portp->tx.buf);
+                       kfree(portp);
+               }
+               kfree(panelp);
+       }
+}
+
 /*****************************************************************************/
 
 /*
@@ -1976,7 +2000,7 @@ static int __init stl_initeio(struct stlbrd *brdp)
        struct stlpanel *panelp;
        unsigned int    status;
        char            *name;
-       int             rc;
+       int             retval;
 
        pr_debug("stl_initeio(brdp=%p)\n", brdp);
 
@@ -2003,18 +2027,20 @@ static int __init stl_initeio(struct stlbrd *brdp)
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
-                       return(-EINVAL);
+                       retval = -EINVAL;
+                       goto err;
                }
                outb((stl_vecmap[brdp->irq] | EIO_0WS |
                        ((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
                        brdp->ioctrl);
        }
 
+       retval = -EBUSY;
        if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
                printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
                        "%x conflicts with another device\n", brdp->brdnr, 
                        brdp->ioaddr1);
-               return(-EBUSY);
+               goto err;
        }
        
        if (brdp->iosize2 > 0)
@@ -2025,8 +2051,7 @@ static int __init stl_initeio(struct stlbrd *brdp)
                        printk(KERN_WARNING "STALLION: Warning, also "
                                "releasing board %d I/O address %x \n", 
                                brdp->brdnr, brdp->ioaddr1);
-                       release_region(brdp->ioaddr1, brdp->iosize1);
-                       return(-EBUSY);
+                       goto err_rel1;
                }
 
 /*
@@ -2035,6 +2060,7 @@ static int __init stl_initeio(struct stlbrd *brdp)
        brdp->clk = CD1400_CLK;
        brdp->isr = stl_eiointr;
 
+       retval = -ENODEV;
        switch (status & EIO_IDBITMASK) {
        case EIO_8PORTM:
                brdp->clk = CD1400_CLK8M;
@@ -2058,11 +2084,11 @@ static int __init stl_initeio(struct stlbrd *brdp)
                        brdp->nrports = 16;
                        break;
                default:
-                       return(-ENODEV);
+                       goto err_rel2;
                }
                break;
        default:
-               return(-ENODEV);
+               goto err_rel2;
        }
 
 /*
@@ -2074,7 +2100,8 @@ static int __init stl_initeio(struct stlbrd *brdp)
        if (!panelp) {
                printk(KERN_WARNING "STALLION: failed to allocate memory "
                        "(size=%Zd)\n", sizeof(struct stlpanel));
-               return -ENOMEM;
+               retval = -ENOMEM;
+               goto err_rel2;
        }
 
        panelp->magic = STL_PANELMAGIC;
@@ -2098,11 +2125,20 @@ static int __init stl_initeio(struct stlbrd *brdp)
        if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
                printk("STALLION: failed to register interrupt "
                    "routine for %s irq=%d\n", name, brdp->irq);
-               rc = -ENODEV;
-       } else {
-               rc = 0;
+               retval = -ENODEV;
+               goto err_fr;
        }
-       return rc;
+
+       return 0;
+err_fr:
+       stl_cleanup_panels(brdp);
+err_rel2:
+       if (brdp->iosize2 > 0)
+               release_region(brdp->ioaddr2, brdp->iosize2);
+err_rel1:
+       release_region(brdp->ioaddr1, brdp->iosize1);
+err:
+       return retval;
 }
 
 /*****************************************************************************/
@@ -2116,7 +2152,7 @@ static int __init stl_initech(struct stlbrd *brdp)
 {
        struct stlpanel *panelp;
        unsigned int    status, nxtid, ioaddr, conflict;
-       int             panelnr, banknr, i;
+       int             panelnr, banknr, i, retval;
        char            *name;
 
        pr_debug("stl_initech(brdp=%p)\n", brdp);
@@ -2136,13 +2172,16 @@ static int __init stl_initech(struct stlbrd *brdp)
                brdp->ioctrl = brdp->ioaddr1 + 1;
                brdp->iostatus = brdp->ioaddr1 + 1;
                status = inb(brdp->iostatus);
-               if ((status & ECH_IDBITMASK) != ECH_ID)
-                       return(-ENODEV);
+               if ((status & ECH_IDBITMASK) != ECH_ID) {
+                       retval = -ENODEV;
+                       goto err;
+               }
                if ((brdp->irq < 0) || (brdp->irq > 15) ||
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
-                       return(-EINVAL);
+                       retval = -EINVAL;
+                       goto err;
                }
                status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
                status |= (stl_vecmap[brdp->irq] << 1);
@@ -2162,13 +2201,16 @@ static int __init stl_initech(struct stlbrd *brdp)
                brdp->ioctrl = brdp->ioaddr1 + 0x20;
                brdp->iostatus = brdp->ioctrl;
                status = inb(brdp->iostatus);
-               if ((status & ECH_IDBITMASK) != ECH_ID)
-                       return(-ENODEV);
+               if ((status & ECH_IDBITMASK) != ECH_ID) {
+                       retval = -ENODEV;
+                       goto err;
+               }
                if ((brdp->irq < 0) || (brdp->irq > 15) ||
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
-                       return(-EINVAL);
+                       retval = -EINVAL;
+                       goto err;
                }
                outb(ECHMC_BRDRESET, brdp->ioctrl);
                outb(ECHMC_INTENABLE, brdp->ioctrl);
@@ -2195,19 +2237,20 @@ static int __init stl_initech(struct stlbrd *brdp)
 
        default:
                printk("STALLION: unknown board type=%d\n", brdp->brdtype);
-               return(-EINVAL);
-               break;
+               retval = -EINVAL;
+               goto err;
        }
 
 /*
  *     Check boards for possible IO address conflicts and return fail status 
  *     if an IO conflict found.
  */
+       retval = -EBUSY;
        if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
                printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
                        "%x conflicts with another device\n", brdp->brdnr, 
                        brdp->ioaddr1);
-               return(-EBUSY);
+               goto err;
        }
        
        if (brdp->iosize2 > 0)
@@ -2218,8 +2261,7 @@ static int __init stl_initech(struct stlbrd *brdp)
                        printk(KERN_WARNING "STALLION: Warning, also "
                                "releasing board %d I/O address %x \n", 
                                brdp->brdnr, brdp->ioaddr1);
-                       release_region(brdp->ioaddr1, brdp->iosize1);
-                       return(-EBUSY);
+                       goto err_rel1;
                }
 
 /*
@@ -2241,12 +2283,12 @@ static int __init stl_initech(struct stlbrd *brdp)
                }
                status = inb(ioaddr + ECH_PNLSTATUS);
                if ((status & ECH_PNLIDMASK) != nxtid)
-                       break;
+                       goto err_fr;
                panelp = kzalloc(sizeof(struct stlpanel), GFP_KERNEL);
                if (!panelp) {
                        printk("STALLION: failed to allocate memory "
                                "(size=%Zd)\n", sizeof(struct stlpanel));
-                       break;
+                       goto err_fr;
                }
                panelp->magic = STL_PANELMAGIC;
                panelp->brdnr = brdp->brdnr;
@@ -2294,7 +2336,7 @@ static int __init stl_initech(struct stlbrd *brdp)
                brdp->panels[panelnr++] = panelp;
                if ((brdp->brdtype != BRD_ECHPCI) &&
                    (ioaddr >= (brdp->ioaddr2 + brdp->iosize2)))
-                       break;
+                       goto err_fr;
        }
 
        brdp->nrpanels = panelnr;
@@ -2306,12 +2348,19 @@ static int __init stl_initech(struct stlbrd *brdp)
        if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
                printk("STALLION: failed to register interrupt "
                    "routine for %s irq=%d\n", name, brdp->irq);
-               i = -ENODEV;
-       } else {
-               i = 0;
+               retval = -ENODEV;
+               goto err_fr;
        }
 
-       return(i);
+       return 0;
+err_fr:
+       stl_cleanup_panels(brdp);
+       if (brdp->iosize2 > 0)
+               release_region(brdp->ioaddr2, brdp->iosize2);
+err_rel1:
+       release_region(brdp->ioaddr1, brdp->iosize1);
+err:
+       return retval;
 }
 
 /*****************************************************************************/
@@ -2325,25 +2374,30 @@ static int __init stl_initech(struct stlbrd *brdp)
 
 static int __init stl_brdinit(struct stlbrd *brdp)
 {
-       int     i;
+       int i, retval;
 
        pr_debug("stl_brdinit(brdp=%p)\n", brdp);
 
        switch (brdp->brdtype) {
        case BRD_EASYIO:
        case BRD_EASYIOPCI:
-               stl_initeio(brdp);
+               retval = stl_initeio(brdp);
+               if (retval)
+                       goto err;
                break;
        case BRD_ECH:
        case BRD_ECHMC:
        case BRD_ECHPCI:
        case BRD_ECH64PCI:
-               stl_initech(brdp);
+               retval = stl_initech(brdp);
+               if (retval)
+                       goto err;
                break;
        default:
                printk("STALLION: board=%d is unknown board type=%d\n",
                        brdp->brdnr, brdp->brdtype);
-               return(ENODEV);
+               retval = -ENODEV;
+               goto err;
        }
 
        stl_brds[brdp->brdnr] = brdp;
@@ -2351,7 +2405,7 @@ static int __init stl_brdinit(struct stlbrd *brdp)
                printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
                        stl_brdnames[brdp->brdtype], brdp->brdnr,
                        brdp->ioaddr1, brdp->irq);
-               return(ENODEV);
+               goto err_free;
        }
 
        for (i = 0; (i < STL_MAXPANELS); i++)
@@ -2362,7 +2416,20 @@ static int __init stl_brdinit(struct stlbrd *brdp)
                "nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
                brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
                brdp->nrports);
-       return(0);
+
+       return 0;
+err_free:
+       free_irq(brdp->irq, brdp);
+
+       stl_cleanup_panels(brdp);
+
+       release_region(brdp->ioaddr1, brdp->iosize1);
+       if (brdp->iosize2 > 0)
+               release_region(brdp->ioaddr2, brdp->iosize2);
+
+       stl_brds[brdp->brdnr] = NULL;
+err:
+       return retval;
 }
 
 /*****************************************************************************/
@@ -2385,29 +2452,6 @@ static int __init stl_getbrdnr(void)
        return(-1);
 }
 
-static void stl_cleanup_panels(struct stlbrd *brdp)
-{
-       struct stlpanel *panelp;
-       struct stlport *portp;
-       unsigned int j, k;
-
-       for (j = 0; j < STL_MAXPANELS; j++) {
-               panelp = brdp->panels[j];
-               if (panelp == NULL)
-                       continue;
-               for (k = 0; k < STL_PORTSPERPANEL; k++) {
-                       portp = panelp->ports[k];
-                       if (portp == NULL)
-                               continue;
-                       if (portp->tty != NULL)
-                               stl_hangup(portp->tty);
-                       kfree(portp->tx.buf);
-                       kfree(portp);
-               }
-               kfree(panelp);
-       }
-}
-
 /*****************************************************************************/
 /*
  *     We have a Stallion board. Allocate a board structure and
@@ -2420,21 +2464,27 @@ static int __devinit stl_pciprobe(struct pci_dev *pdev,
 {
        struct stlbrd *brdp;
        unsigned int brdtype = ent->driver_data;
+       int retval = -ENODEV;
 
        if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE)
-               return -ENODEV;
+               goto err;
 
        dev_info(&pdev->dev, "please, report this to LKML: %x/%x/%x\n",
                        pdev->vendor, pdev->device, pdev->class);
 
-       if (pci_enable_device(pdev))
-               return(-EIO);
-       if ((brdp = stl_allocbrd()) == NULL)
-               return(-ENOMEM);
-       if ((brdp->brdnr = stl_getbrdnr()) < 0) {
+       retval = pci_enable_device(pdev);
+       if (retval)
+               goto err;
+       brdp = stl_allocbrd();
+       if (brdp == NULL) {
+               retval = -ENOMEM;
+               goto err;
+       }
+       brdp->brdnr = stl_getbrdnr();
+       if (brdp->brdnr < 0) {
                dev_err(&pdev->dev, "too many boards found, "
                        "maximum supported %d\n", STL_MAXBRDS);
-               return(0);
+               goto err_fr;
        }
        brdp->brdtype = brdtype;
 
@@ -2461,11 +2511,17 @@ static int __devinit stl_pciprobe(struct pci_dev *pdev,
        }
 
        brdp->irq = pdev->irq;
-       stl_brdinit(brdp);
+       retval = stl_brdinit(brdp);
+       if (retval)
+               goto err_fr;
 
        pci_set_drvdata(pdev, brdp);
 
-       return(0);
+       return 0;
+err_fr:
+       kfree(brdp);
+err:
+       return retval;
 }
 
 static void __devexit stl_pciremove(struct pci_dev *pdev)
@@ -2528,7 +2584,8 @@ static int __init stl_initbrds(void)
                brdp->ioaddr2 = confp->ioaddr2;
                brdp->irq = confp->irq;
                brdp->irqtype = confp->irqtype;
-               stl_brdinit(brdp);
+               if (stl_brdinit(brdp))
+                       kfree(brdp);
        }
 
 /*