From: Jiri Slaby Date: Fri, 8 Dec 2006 10:39:10 +0000 (-0800) Subject: [PATCH] Char: stallion, implement fail paths X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3b85b3413df1feb2b4ef17d829c1ee895fc64075;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [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 Cc: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c index bc2911396b7e..24bdb48310c2 100644 --- 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); } /*