diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index f057430..ae2924c 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -481,53 +482,54 @@ static void free_all_reserved_pages(void) #define SND_MEM_PROC_FILE "driver/snd-page-alloc" static struct proc_dir_entry *snd_mem_proc; -static int snd_mem_proc_read(char *page, char **start, off_t off, - int count, int *eof, void *data) +static int snd_mem_proc_read(struct seq_file *seq, void *offset) { - int len = 0; long pages = snd_allocated_pages >> (PAGE_SHIFT-12); struct snd_mem_list *mem; int devno; static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" }; mutex_lock(&list_mutex); - len += snprintf(page + len, count - len, - "pages : %li bytes (%li pages per %likB)\n", - pages * PAGE_SIZE, pages, PAGE_SIZE / 1024); + seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n", + pages * PAGE_SIZE, pages, PAGE_SIZE / 1024); devno = 0; list_for_each_entry(mem, &mem_list_head, list) { devno++; - len += snprintf(page + len, count - len, - "buffer %d : ID %08x : type %s\n", - devno, mem->id, types[mem->buffer.dev.type]); - len += snprintf(page + len, count - len, - " addr = 0x%lx, size = %d bytes\n", - (unsigned long)mem->buffer.addr, (int)mem->buffer.bytes); + seq_printf(seq, "buffer %d : ID %08x : type %s\n", + devno, mem->id, types[mem->buffer.dev.type]); + seq_printf(seq, " addr = 0x%lx, size = %d bytes\n", + (unsigned long)mem->buffer.addr, + (int)mem->buffer.bytes); } mutex_unlock(&list_mutex); - return len; + return 0; +} + +static int snd_mem_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, snd_mem_proc_read, NULL); } /* FIXME: for pci only - other bus? */ #ifdef CONFIG_PCI #define gettoken(bufp) strsep(bufp, " \t\n") -static int snd_mem_proc_write(struct file *file, const char __user *buffer, - unsigned long count, void *data) +static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer, + size_t count, loff_t * ppos) { char buf[128]; char *token, *p; - if (count > ARRAY_SIZE(buf) - 1) - count = ARRAY_SIZE(buf) - 1; + if (count > sizeof(buf) - 1) + return -EINVAL; if (copy_from_user(buf, buffer, count)) return -EFAULT; - buf[ARRAY_SIZE(buf) - 1] = '\0'; + buf[count] = '\0'; p = buf; token = gettoken(&p); if (! token || *token == '#') - return (int)count; + return count; if (strcmp(token, "add") == 0) { char *endp; int vendor, device, size, buffers; @@ -548,7 +550,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer, (buffers = simple_strtol(token, NULL, 0)) <= 0 || buffers > 4) { printk(KERN_ERR "snd-page-alloc: invalid proc write format\n"); - return (int)count; + return count; } vendor &= 0xffff; device &= 0xffff; @@ -560,7 +562,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer, if (pci_set_dma_mask(pci, mask) < 0 || pci_set_consistent_dma_mask(pci, mask) < 0) { printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device); - return (int)count; + return count; } } for (i = 0; i < buffers; i++) { @@ -570,7 +572,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer, size, &dmab) < 0) { printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); pci_dev_put(pci); - return (int)count; + return count; } snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci)); } @@ -596,9 +598,21 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer, free_all_reserved_pages(); else printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n"); - return (int)count; + return count; } #endif /* CONFIG_PCI */ + +static const struct file_operations snd_mem_proc_fops = { + .owner = THIS_MODULE, + .open = snd_mem_proc_open, + .read = seq_read, +#ifdef CONFIG_PCI + .write = snd_mem_proc_write, +#endif + .llseek = seq_lseek, + .release = single_release, +}; + #endif /* CONFIG_PROC_FS */ /* @@ -609,12 +623,8 @@ static int __init snd_mem_init(void) { #ifdef CONFIG_PROC_FS snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL); - if (snd_mem_proc) { - snd_mem_proc->read_proc = snd_mem_proc_read; -#ifdef CONFIG_PCI - snd_mem_proc->write_proc = snd_mem_proc_write; -#endif - } + if (snd_mem_proc) + snd_mem_proc->proc_fops = &snd_mem_proc_fops; #endif return 0; } @@ -632,6 +642,61 @@ module_init(snd_mem_init) module_exit(snd_mem_exit) +#include +#include +#include +#include + +static const struct file_operations *ksplice_old_snd_mem_proc_fops; + +static int ksplice_memalloc_check_pde(void) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) + struct task_struct *g, *tsk; + do_each_thread(g, tsk) { + struct fdtable *fdt = files_fdtable(tsk->files); + int fd; + for (fd = find_first_bit(fdt->open_fds->fds_bits, fdt->max_fds); + fd < fdt->max_fds; + fd = find_next_bit(fdt->open_fds->fds_bits, fdt->max_fds, + fd + 1)) { + if (PDE(fcheck_files(tsk->files, fd)->f_dentry->d_inode) + == snd_mem_proc) + return 1; + } + } while_each_thread(g, tsk); +#endif + return 0; +} + +static int ksplice_memalloc_check_apply(void) +{ + return ksplice_memalloc_check_pde(); +} +ksplice_check_apply(ksplice_memalloc_check_apply); + +static void ksplice_memalloc_apply(void) +{ + ksplice_old_snd_mem_proc_fops = snd_mem_proc->proc_fops; + snd_mem_proc->proc_fops = &snd_mem_proc_fops; +} +ksplice_apply(ksplice_memalloc_apply); + +static int ksplice_memalloc_check_reverse(void) +{ + if (snd_mem_proc->proc_fops != &snd_mem_proc_fops) + return 1; + return ksplice_memalloc_check_pde(); +} +ksplice_check_reverse(ksplice_memalloc_check_reverse); + +static void ksplice_memalloc_reverse(void) +{ + snd_mem_proc->proc_fops = ksplice_old_snd_mem_proc_fops; +} +ksplice_reverse(ksplice_memalloc_reverse); + + /* * exports */