diff options
Diffstat (limited to 'arch/powerpc/kernel/rtas_flash.c')
| -rw-r--r-- | arch/powerpc/kernel/rtas_flash.c | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c index a85117d5c9a..67a84d8f118 100644 --- a/arch/powerpc/kernel/rtas_flash.c +++ b/arch/powerpc/kernel/rtas_flash.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/init.h> +#include <linux/slab.h> #include <linux/proc_fs.h> #include <asm/delay.h> #include <asm/uaccess.h> @@ -93,12 +94,8 @@ struct flash_block_list { struct flash_block_list *next; struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; }; -struct flash_block_list_header { /* just the header of flash_block_list */ - unsigned long num_blocks; - struct flash_block_list *next; -}; -static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL}; +static struct flash_block_list *rtas_firmware_flash_list; /* Use slab cache to guarantee 4k alignment */ static struct kmem_cache *flash_block_cache = NULL; @@ -107,13 +104,14 @@ static struct kmem_cache *flash_block_cache = NULL; /* Local copy of the flash block list. * We only allow one open of the flash proc file and create this - * list as we go. This list will be put in the - * rtas_firmware_flash_list var once it is fully read. + * list as we go. The rtas_firmware_flash_list varable will be + * set once the data is fully read. * * For convenience as we build the list we use virtual addrs, * we do not fill in the version number, and the length field * is treated as the number of entries currently in the block - * (i.e. not a byte count). This is all fixed on release. + * (i.e. not a byte count). This is all fixed when calling + * the flash routine. */ /* Status int must be first member of struct */ @@ -200,16 +198,16 @@ static int rtas_flash_release(struct inode *inode, struct file *file) if (uf->flist) { /* File was opened in write mode for a new flash attempt */ /* Clear saved list */ - if (rtas_firmware_flash_list.next) { - free_flash_list(rtas_firmware_flash_list.next); - rtas_firmware_flash_list.next = NULL; + if (rtas_firmware_flash_list) { + free_flash_list(rtas_firmware_flash_list); + rtas_firmware_flash_list = NULL; } if (uf->status != FLASH_AUTH) uf->status = flash_list_valid(uf->flist); if (uf->status == FLASH_IMG_READY) - rtas_firmware_flash_list.next = uf->flist; + rtas_firmware_flash_list = uf->flist; else free_flash_list(uf->flist); @@ -592,7 +590,7 @@ static void rtas_flash_firmware(int reboot_type) unsigned long rtas_block_list; int i, status, update_token; - if (rtas_firmware_flash_list.next == NULL) + if (rtas_firmware_flash_list == NULL) return; /* nothing to do */ if (reboot_type != SYS_RESTART) { @@ -609,20 +607,25 @@ static void rtas_flash_firmware(int reboot_type) return; } - /* NOTE: the "first" block list is a global var with no data - * blocks in the kernel data segment. We do this because - * we want to ensure this block_list addr is under 4GB. + /* + * NOTE: the "first" block must be under 4GB, so we create + * an entry with no data blocks in the reserved buffer in + * the kernel data segment. */ - rtas_firmware_flash_list.num_blocks = 0; - flist = (struct flash_block_list *)&rtas_firmware_flash_list; + spin_lock(&rtas_data_buf_lock); + flist = (struct flash_block_list *)&rtas_data_buf[0]; + flist->num_blocks = 0; + flist->next = rtas_firmware_flash_list; rtas_block_list = virt_to_abs(flist); if (rtas_block_list >= 4UL*1024*1024*1024) { printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); + spin_unlock(&rtas_data_buf_lock); return; } printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); /* Update the block_list in place. */ + rtas_firmware_flash_list = NULL; /* too hard to backout on error */ image_size = 0; for (f = flist; f; f = next) { /* Translate data addrs to absolute */ @@ -663,6 +666,7 @@ static void rtas_flash_firmware(int reboot_type) printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); break; } + spin_unlock(&rtas_data_buf_lock); } static void remove_flash_pde(struct proc_dir_entry *dp) |