1 files changed, 93 insertions, 81 deletions

diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
index b667823982..4f4ba9b6d1 100644
--- a/drivers/firmware/dell_rbu.c
+++ b/drivers/firmware/dell_rbu.c
@@ -50,7 +50,7 @@
 MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
 MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
 MODULE_LICENSE("GPL");
-MODULE_VERSION("2.0");
+MODULE_VERSION("3.0");
 
 #define BIOS_SCAN_LIMIT 0xffffffff
 #define MAX_IMAGE_LENGTH 16
@@ -62,15 +62,16 @@ static struct _rbu_data {
         int dma_alloc;
         spinlock_t lock;
         unsigned long packet_read_count;
-        unsigned long packet_write_count;
         unsigned long num_packets;
         unsigned long packetsize;
+        unsigned long imagesize;
         int entry_created;
 } rbu_data;
 
 static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
 module_param_string(image_type, image_type, sizeof (image_type), 0);
-MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet");
+MODULE_PARM_DESC(image_type,
+        "BIOS image type. choose- mono or packet or init");
 
 struct packet_data {
         struct list_head list;
@@ -88,55 +89,13 @@ static dma_addr_t dell_rbu_dmaaddr;
 static void init_packet_head(void)
 {
         INIT_LIST_HEAD(&packet_data_head.list);
-        rbu_data.packet_write_count = 0;
         rbu_data.packet_read_count = 0;
         rbu_data.num_packets = 0;
         rbu_data.packetsize = 0;
+        rbu_data.imagesize = 0;
 }
 
-static int fill_last_packet(void *data, size_t length)
-{
-        struct list_head *ptemp_list;
-        struct packet_data *packet = NULL;
-        int packet_count = 0;
-
-        pr_debug("fill_last_packet: entry \n");
-
-        if (!rbu_data.num_packets) {
-                pr_debug("fill_last_packet: num_packets=0\n");
-                return -ENOMEM;
-        }
-
-        packet_count = rbu_data.num_packets;
-
-        ptemp_list = (&packet_data_head.list)->prev;
-
-        packet = list_entry(ptemp_list, struct packet_data, list);
-
-        if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) {
-                pr_debug("dell_rbu:%s: packet size data "
-                        "overrun\n", __FUNCTION__);
-                return -EINVAL;
-        }
-
-        pr_debug("fill_last_packet : buffer = %p\n", packet->data);
-
-        memcpy((packet->data + rbu_data.packet_write_count), data, length);
-
-        if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) {
-                /*
-                 * this was the last data chunk in the packet
-                 * so reinitialize the packet data counter to zero
-                 */
-                rbu_data.packet_write_count = 0;
-        } else
-                rbu_data.packet_write_count += length;
-
-        pr_debug("fill_last_packet: exit \n");
-        return 0;
-}
-
-static int create_packet(size_t length)
+static int create_packet(void *data, size_t length)
 {
         struct packet_data *newpacket;
         int ordernum = 0;
@@ -186,9 +145,11 @@ static int create_packet(size_t length)
         INIT_LIST_HEAD(&newpacket->list);
         list_add_tail(&newpacket->list, &packet_data_head.list);
         /*
-         * packets have fixed size
+         * packets may not have fixed size
          */
-        newpacket->length = rbu_data.packetsize;
+        newpacket->length = length;
+
+        memcpy(newpacket->data, data, length);
 
         pr_debug("create_packet: exit \n");
 
@@ -198,13 +159,37 @@ static int create_packet(size_t length)
 static int packetize_data(void *data, size_t length)
 {
         int rc = 0;
+        int done = 0;
+        int packet_length;
+        u8 *temp;
+        u8 *end = (u8 *) data + length;
+        pr_debug("packetize_data: data length %d\n", length);
+        if (!rbu_data.packetsize) {
+                printk(KERN_WARNING
+                        "dell_rbu: packetsize not specified\n");
+                return -EIO;
+        }
 
-        if (!rbu_data.packet_write_count) {
-                if ((rc = create_packet(length)))
+        temp = (u8 *) data;
+
+        /* packetize the hunk */
+        while (!done) {
+                if ((temp + rbu_data.packetsize) < end)
+                        packet_length = rbu_data.packetsize;
+                else {
+                        /* this is the last packet */
+                        packet_length = end - temp;
+                        done = 1;
+                }
+
+                if ((rc = create_packet(temp, packet_length)))
                         return rc;
+
+                pr_debug("%lu:%lu\n", temp, (end - temp));
+                temp += packet_length;
         }
-        if ((rc = fill_last_packet(data, length)))
-                return rc;
+
+        rbu_data.imagesize = length;
 
         return rc;
 }
@@ -243,7 +228,7 @@ static int do_packet_read(char *data, struct list_head *ptemp_list,
         return bytes_copied;
 }
 
-static int packet_read_list(char *data, size_t *pread_length)
+static int packet_read_list(char *data, size_t * pread_length)
 {
         struct list_head *ptemp_list;
         int temp_count = 0;
@@ -303,10 +288,9 @@ static void packet_empty_list(void)
                         newpacket->ordernum);
                 kfree(newpacket);
         }
-        rbu_data.packet_write_count = 0;
         rbu_data.packet_read_count = 0;
         rbu_data.num_packets = 0;
-        rbu_data.packetsize = 0;
+        rbu_data.imagesize = 0;
 }
 
 /*
@@ -425,7 +409,6 @@ static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
         size_t bytes_left;
         size_t data_length;
         char *ptempBuf = buffer;
-        unsigned long imagesize;
 
         /* check to see if we have something to return */
         if (rbu_data.num_packets == 0) {
@@ -434,22 +417,20 @@ static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
                 goto read_rbu_data_exit;
         }
 
-        imagesize = rbu_data.num_packets * rbu_data.packetsize;
-
-        if (pos > imagesize) {
+        if (pos > rbu_data.imagesize) {
                 retval = 0;
                 printk(KERN_WARNING "dell_rbu:read_packet_data: "
                         "data underrun\n");
                 goto read_rbu_data_exit;
         }
 
-        bytes_left = imagesize - pos;
+        bytes_left = rbu_data.imagesize - pos;
         data_length = min(bytes_left, count);
 
         if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
                 goto read_rbu_data_exit;
 
-        if ((pos + count) > imagesize) {
+        if ((pos + count) > rbu_data.imagesize) {
                 rbu_data.packet_read_count = 0;
                 /* this was the last copy */
                 retval = bytes_left;
@@ -499,7 +480,7 @@ static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
 }
 
 static ssize_t read_rbu_data(struct kobject *kobj, char *buffer,
-                        loff_t pos, size_t count)
+        loff_t pos, size_t count)
 {
         ssize_t ret_count = 0;
 
@@ -531,13 +512,18 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
                         memcpy(rbu_data.image_update_buffer,
                                 fw->data, fw->size);
         } else if (!strcmp(image_type, "packet")) {
-                if (!rbu_data.packetsize)
-                        rbu_data.packetsize = fw->size;
-                else if (rbu_data.packetsize != fw->size) {
+                /*
+                 * we need to free previous packets if a
+                 * new hunk of packets needs to be downloaded
+                 */
+                packet_empty_list();
+                if (packetize_data(fw->data, fw->size))
+                        /* Incase something goes wrong when we are
+                         * in middle of packetizing the data, we
+                         * need to free up whatever packets might
+                         * have been created before we quit.
+                         */
                         packet_empty_list();
-                        rbu_data.packetsize = fw->size;
-                }
-                packetize_data(fw->data, fw->size);
         } else
                 pr_debug("invalid image type specified.\n");
         spin_unlock(&rbu_data.lock);
@@ -553,7 +539,7 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
 }
 
 static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
-                        loff_t pos, size_t count)
+        loff_t pos, size_t count)
 {
         int size = 0;
         if (!pos)
@@ -562,7 +548,7 @@ static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
 }
 
 static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
-                        loff_t pos, size_t count)
+        loff_t pos, size_t count)
 {
         int rc = count;
         int req_firm_rc = 0;
@@ -621,25 +607,49 @@ static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
         return rc;
 }
 
+static ssize_t read_rbu_packet_size(struct kobject *kobj, char *buffer,
+        loff_t pos, size_t count)
+{
+        int size = 0;
+        if (!pos) {
+                spin_lock(&rbu_data.lock);
+                size = sprintf(buffer, "%lu\n", rbu_data.packetsize);
+                spin_unlock(&rbu_data.lock);
+        }
+        return size;
+}
+
+static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer,
+        loff_t pos, size_t count)
+{
+        unsigned long temp;
+        spin_lock(&rbu_data.lock);
+        packet_empty_list();
+        sscanf(buffer, "%lu", &temp);
+        if (temp < 0xffffffff)
+                rbu_data.packetsize = temp;
+
+        spin_unlock(&rbu_data.lock);
+        return count;
+}
+
 static struct bin_attribute rbu_data_attr = {
-        .attr = {
-                .name = "data",
-                .owner = THIS_MODULE,
-                .mode = 0444,
-        },
+        .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
         .read = read_rbu_data,
 };
 
 static struct bin_attribute rbu_image_type_attr = {
-        .attr = {
-                .name = "image_type",
-                .owner = THIS_MODULE,
-                .mode = 0644,
-        },
+        .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
         .read = read_rbu_image_type,
         .write = write_rbu_image_type,
 };
 
+static struct bin_attribute rbu_packet_size_attr = {
+        .attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644},
+        .read = read_rbu_packet_size,
+        .write = write_rbu_packet_size,
+};
+
 static int __init dcdrbu_init(void)
 {
         int rc = 0;
@@ -657,6 +667,8 @@ static int __init dcdrbu_init(void)
 
         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
+        sysfs_create_bin_file(&rbu_device->dev.kobj,
+                &rbu_packet_size_attr);
 
         rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
                 "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu);