typhoon: repair firmware loading

The conversion to avoid using pci_alloc_consistent() broke the firmware
load process, as well as added an order-4 kmalloc and doubled the memory
usage of the firmware image. Go back to loading a page at a time.

Also, since the user can now give us utter garbage for firmware, do a
cursory validation so we don't try to load just anything.

Signed-off-by: David Dillow <dave@thedillows.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 83 insertions, 54 deletions

diff --git a/drivers/net/typhoon.c b/drivers/net/typhoon.c
index 9bba7871636..9dd4f76a2ff 100644
--- a/drivers/net/typhoon.c
+++ b/drivers/net/typhoon.c
@@ -100,10 +100,11 @@ static const int multicast_filter_limit = 32;
 #define PKT_BUF_SZ              1536
 
 #define DRV_MODULE_NAME         "typhoon"
-#define DRV_MODULE_VERSION      "1.5.8"
-#define DRV_MODULE_RELDATE      "06/11/09"
+#define DRV_MODULE_VERSION      "1.5.9"
+#define DRV_MODULE_RELDATE      "Mar 2, 2009"
 #define PFX                     DRV_MODULE_NAME ": "
 #define ERR_PFX                 KERN_ERR PFX
+#define FIRMWARE_NAME           "3com/typhoon.bin"
 
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -136,7 +137,6 @@ static const int multicast_filter_limit = 32;
 static char version[] __devinitdata =
     "typhoon.c: version " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
 
-#define FIRMWARE_NAME           "3com/typhoon.bin"
 MODULE_AUTHOR("David Dillow <dave@thedillows.org>");
 MODULE_VERSION(DRV_MODULE_VERSION);
 MODULE_LICENSE("GPL");
@@ -1347,11 +1347,16 @@ typhoon_init_rings(struct typhoon *tp)
 }
 
 static const struct firmware *typhoon_fw;
-static u8 *typhoon_fw_image;
 
 static int
 typhoon_request_firmware(struct typhoon *tp)
 {
+        const struct typhoon_file_header *fHdr;
+        const struct typhoon_section_header *sHdr;
+        const u8 *image_data;
+        u32 numSections;
+        u32 section_len;
+        u32 remaining;
         int err;
 
         if (typhoon_fw)
@@ -1360,31 +1365,45 @@ typhoon_request_firmware(struct typhoon *tp)
         err = request_firmware(&typhoon_fw, FIRMWARE_NAME, &tp->pdev->dev);
         if (err) {
                 printk(KERN_ERR "%s: Failed to load firmware \"%s\"\n",
-                       tp->name, FIRMWARE_NAME);
+                                tp->name, FIRMWARE_NAME);
                 return err;
         }
 
-        if (typhoon_fw->size < sizeof(struct typhoon_file_header) ||
-            memcmp(typhoon_fw->data, "TYPHOON", 8)) {
-                printk(KERN_ERR "%s: Invalid firmware image\n",
-                       tp->name);
-                err = -EINVAL;
-                goto out_err;
-        }
+        image_data = (u8 *) typhoon_fw->data;
+        remaining = typhoon_fw->size;
+        if (remaining < sizeof(struct typhoon_file_header))
+                goto invalid_fw;
 
-        typhoon_fw_image = kmalloc(typhoon_fw->size, GFP_KERNEL);
-        if (!typhoon_fw_image) {
-                err = -ENOMEM;
-                goto out_err;
+        fHdr = (struct typhoon_file_header *) image_data;
+        if (memcmp(fHdr->tag, "TYPHOON", 8))
+                goto invalid_fw;
+
+        numSections = le32_to_cpu(fHdr->numSections);
+        image_data += sizeof(struct typhoon_file_header);
+        remaining -= sizeof(struct typhoon_file_header);
+
+        while (numSections--) {
+                if (remaining < sizeof(struct typhoon_section_header))
+                        goto invalid_fw;
+
+                sHdr = (struct typhoon_section_header *) image_data;
+                image_data += sizeof(struct typhoon_section_header);
+                section_len = le32_to_cpu(sHdr->len);
+
+                if (remaining < section_len)
+                        goto invalid_fw;
+
+                image_data += section_len;
+                remaining -= section_len;
         }
-        memcpy(typhoon_fw_image, typhoon_fw->data, typhoon_fw->size);
 
         return 0;
 
-out_err:
+invalid_fw:
+        printk(KERN_ERR "%s: Invalid firmware image\n", tp->name);
         release_firmware(typhoon_fw);
         typhoon_fw = NULL;
-        return err;
+        return -EINVAL;
 }
 
 static int
@@ -1395,24 +1414,29 @@ typhoon_download_firmware(struct typhoon *tp)
         const struct typhoon_file_header *fHdr;
         const struct typhoon_section_header *sHdr;
         const u8 *image_data;
-        dma_addr_t image_dma;
+        void *dpage;
+        dma_addr_t dpage_dma;
         __sum16 csum;
         u32 irqEnabled;
         u32 irqMasked;
         u32 numSections;
         u32 section_len;
+        u32 len;
         u32 load_addr;
         u32 hmac;
         int i;
         int err;
 
-        image_data = typhoon_fw_image;
+        image_data = (u8 *) typhoon_fw->data;
         fHdr = (struct typhoon_file_header *) image_data;
 
+        /* Cannot just map the firmware image using pci_map_single() as
+         * the firmware is vmalloc()'d and may not be physically contiguous,
+         * so we allocate some consistent memory to copy the sections into.
+         */
         err = -ENOMEM;
-        image_dma = pci_map_single(pdev, (u8 *) image_data,
-                                   typhoon_fw->size, PCI_DMA_TODEVICE);
-        if (pci_dma_mapping_error(pdev, image_dma)) {
+        dpage = pci_alloc_consistent(pdev, PAGE_SIZE, &dpage_dma);
+        if(!dpage) {
                 printk(KERN_ERR "%s: no DMA mem for firmware\n", tp->name);
                 goto err_out;
         }
@@ -1460,34 +1484,41 @@ typhoon_download_firmware(struct typhoon *tp)
                 load_addr = le32_to_cpu(sHdr->startAddr);
                 section_len = le32_to_cpu(sHdr->len);
 
-                if (typhoon_wait_interrupt(ioaddr) < 0 ||
-                    ioread32(ioaddr + TYPHOON_REG_STATUS) !=
-                    TYPHOON_STATUS_WAITING_FOR_SEGMENT) {
-                        printk(KERN_ERR "%s: segment ready timeout\n",
-                               tp->name);
-                        goto err_out_irq;
-                }
+                while(section_len) {
+                        len = min_t(u32, section_len, PAGE_SIZE);
 
-                /* Do an pseudo IPv4 checksum on the data -- first
-                 * need to convert each u16 to cpu order before
-                 * summing. Fortunately, due to the properties of
-                 * the checksum, we can do this once, at the end.
-                 */
-                csum = csum_fold(csum_partial(image_data, section_len, 0));
-
-                iowrite32(section_len, ioaddr + TYPHOON_REG_BOOT_LENGTH);
-                iowrite32(le16_to_cpu((__force __le16)csum),
-                          ioaddr + TYPHOON_REG_BOOT_CHECKSUM);
-                iowrite32(load_addr,
-                          ioaddr + TYPHOON_REG_BOOT_DEST_ADDR);
-                iowrite32(0, ioaddr + TYPHOON_REG_BOOT_DATA_HI);
-                iowrite32(image_dma + (image_data - typhoon_fw_image),
-                          ioaddr + TYPHOON_REG_BOOT_DATA_LO);
-                typhoon_post_pci_writes(ioaddr);
-                iowrite32(TYPHOON_BOOTCMD_SEG_AVAILABLE,
-                          ioaddr + TYPHOON_REG_COMMAND);
+                        if(typhoon_wait_interrupt(ioaddr) < 0 ||
+                           ioread32(ioaddr + TYPHOON_REG_STATUS) !=
+                           TYPHOON_STATUS_WAITING_FOR_SEGMENT) {
+                                printk(KERN_ERR "%s: segment ready timeout\n",
+                                       tp->name);
+                                goto err_out_irq;
+                        }
 
-                image_data += section_len;
+                        /* Do an pseudo IPv4 checksum on the data -- first
+                         * need to convert each u16 to cpu order before
+                         * summing. Fortunately, due to the properties of
+                         * the checksum, we can do this once, at the end.
+                         */
+                        csum = csum_fold(csum_partial_copy_nocheck(image_data,
+                                                                  dpage, len,
+                                                                  0));
+
+                        iowrite32(len, ioaddr + TYPHOON_REG_BOOT_LENGTH);
+                        iowrite32(le16_to_cpu((__force __le16)csum),
+                                        ioaddr + TYPHOON_REG_BOOT_CHECKSUM);
+                        iowrite32(load_addr,
+                                        ioaddr + TYPHOON_REG_BOOT_DEST_ADDR);
+                        iowrite32(0, ioaddr + TYPHOON_REG_BOOT_DATA_HI);
+                        iowrite32(dpage_dma, ioaddr + TYPHOON_REG_BOOT_DATA_LO);
+                        typhoon_post_pci_writes(ioaddr);
+                        iowrite32(TYPHOON_BOOTCMD_SEG_AVAILABLE,
+                               ioaddr + TYPHOON_REG_COMMAND);
+
+                        image_data += len;
+                        load_addr += len;
+                        section_len -= len;
+                }
         }
 
         if(typhoon_wait_interrupt(ioaddr) < 0 ||
@@ -1511,7 +1542,7 @@ err_out_irq:
         iowrite32(irqMasked, ioaddr + TYPHOON_REG_INTR_MASK);
         iowrite32(irqEnabled, ioaddr + TYPHOON_REG_INTR_ENABLE);
 
-        pci_unmap_single(pdev, image_dma,  typhoon_fw->size, PCI_DMA_TODEVICE);
+        pci_free_consistent(pdev, PAGE_SIZE, dpage, dpage_dma);
 
 err_out:
         return err;
@@ -2651,10 +2682,8 @@ typhoon_init(void)
 static void __exit
 typhoon_cleanup(void)
 {
-        if (typhoon_fw) {
-                kfree(typhoon_fw_image);
+        if (typhoon_fw)
                 release_firmware(typhoon_fw);
-        }
         pci_unregister_driver(&typhoon_driver);
 }