From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ey-out-1920.google.com ([74.125.78.148]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1MaPzv-0008Fy-VP for linux-mtd@lists.infradead.org; Mon, 10 Aug 2009 08:12:56 +0000 Received: by ey-out-1920.google.com with SMTP id 5so915248eyb.24 for ; Mon, 10 Aug 2009 01:12:50 -0700 (PDT) Message-ID: <4A7FD765.3020200@gmail.com> Date: Mon, 10 Aug 2009 10:16:37 +0200 From: Roel Kluin MIME-Version: 1.0 To: Artem Bityutskiy Subject: Re: pmcmsp-flash.c: correct clean up? References: <4A709A88.30103@gmail.com> <4A7EED48.6050103@gmail.com> In-Reply-To: <4A7EED48.6050103@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: linux-mtd@lists.infradead.org, Andrew Morton , dwmw2@infradead.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This also adds cleaning up after errors in init_msp_flash(). Also cleanup_msp_flash() attempts to determine the size of msp_flash with `sizeof(msp_flash) / sizeof(struct mtd_info **)' This will not work since msp_flash is not an array. Signed-off-by: Roel Kluin --- > I think jumping into the middle of a loop is not nice. Would it > be better to free the recources belonging to the current interation > inside the allocation loop, and then jump to the beginning of > the freeing loop instead? Done, thanks. diff --git a/drivers/mtd/maps/pmcmsp-flash.c b/drivers/mtd/maps/pmcmsp-flash.c index 4768bd5..c8fd8da 100644 --- a/drivers/mtd/maps/pmcmsp-flash.c +++ b/drivers/mtd/maps/pmcmsp-flash.c @@ -50,7 +50,7 @@ static int fcnt; static int __init init_msp_flash(void) { - int i, j; + int i, j, ret = -ENOMEM; int offset, coff; char *env; int pcnt; @@ -75,14 +75,16 @@ static int __init init_msp_flash(void) printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt); msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL); + if (!msp_flash) + return -ENOMEM; + msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL); + if (!msp_parts) + goto free_msp_flash; + msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL); - if (!msp_flash || !msp_parts || !msp_maps) { - kfree(msp_maps); - kfree(msp_parts); - kfree(msp_flash); - return -ENOMEM; - } + if (!msp_maps) + goto free_msp_parts; /* loop over the flash devices, initializing each */ for (i = 0; i < fcnt; i++) { @@ -100,13 +102,18 @@ static int __init init_msp_flash(void) msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition), GFP_KERNEL); + if (!msp_parts[i]) + goto cleanup_loop; /* now initialize the devices proper */ flash_name[5] = '0' + i; env = prom_getenv(flash_name); - if (sscanf(env, "%x:%x", &addr, &size) < 2) - return -ENXIO; + if (sscanf(env, "%x:%x", &addr, &size) < 2) { + ret = -ENXIO; + kfree(msp_parts[i]); + goto cleanup_loop; + } addr = CPHYSADDR(addr); printk(KERN_NOTICE @@ -122,13 +129,23 @@ static int __init init_msp_flash(void) */ if (size > CONFIG_MSP_FLASH_MAP_LIMIT) size = CONFIG_MSP_FLASH_MAP_LIMIT; + msp_maps[i].virt = ioremap(addr, size); + if (msp_maps[i].virt == NULL) { + ret = -ENXIO; + kfree(msp_parts[i]); + goto cleanup_loop; + } + msp_maps[i].bankwidth = 1; - msp_maps[i].name = strncpy(kmalloc(7, GFP_KERNEL), - flash_name, 7); + msp_maps[i].name = kmalloc(7, GFP_KERNEL); + if (!msp_maps[i].name) { + iounmap(msp_maps[i].virt); + kfree(msp_parts[i]); + goto cleanup_loop; + } - if (msp_maps[i].virt == NULL) - return -ENXIO; + msp_maps[i].name = strncpy(msp_maps[i].name, flash_name, 7); for (j = 0; j < pcnt; j++) { part_name[5] = '0' + i; @@ -136,8 +153,14 @@ static int __init init_msp_flash(void) env = prom_getenv(part_name); - if (sscanf(env, "%x:%x:%n", &offset, &size, &coff) < 2) - return -ENXIO; + if (sscanf(env, "%x:%x:%n", &offset, &size, + &coff) < 2) { + ret = -ENXIO; + kfree(msp_maps[i].name); + iounmap(msp_maps[i].virt); + kfree(msp_parts[i]); + goto cleanup_loop; + } msp_parts[i][j].size = size; msp_parts[i][j].offset = offset; @@ -152,18 +175,37 @@ static int __init init_msp_flash(void) add_mtd_partitions(msp_flash[i], msp_parts[i], pcnt); } else { printk(KERN_ERR "map probe failed for flash\n"); - return -ENXIO; + ret = -ENXIO; + kfree(msp_maps[i].name); + iounmap(msp_maps[i].virt); + kfree(msp_parts[i]); + goto cleanup_loop; } } return 0; + +cleanup_loop: + while (i--) { + del_mtd_partitions(msp_flash[i]); + map_destroy(msp_flash[i]); + kfree(msp_maps[i].name); + iounmap(msp_maps[i].virt); + kfree(msp_parts[i]); + } + kfree(msp_maps); +free_msp_parts: + kfree(msp_parts); +free_msp_flash: + kfree(msp_flash); + return ret; } static void __exit cleanup_msp_flash(void) { int i; - for (i = 0; i < sizeof(msp_flash) / sizeof(struct mtd_info **); i++) { + for (i = 0; i < fcnt; i++) { del_mtd_partitions(msp_flash[i]); map_destroy(msp_flash[i]); iounmap((void *)msp_maps[i].virt);