Add the powerpc-specific sync() method to struct nvram_ops and implement the corresponding ioctl in the nvram module. This allows the nvram module to replace the generic_nvram module. Signed-off-by: Finn Thain --- On PPC32, the IOC_NVRAM_SYNC ioctl call always returns 0, even for those platforms that don't implement ppc_md.nvram_sync. This patch retains that quirk. It might be better to return failure (which is what PPC64 does). Changed since v1: - Don't bother acquiring the mutex for unimplemented ioctls. --- arch/powerpc/include/asm/nvram.h | 3 --- arch/powerpc/kernel/setup_32.c | 6 +++--- drivers/char/generic_nvram.c | 2 +- drivers/char/nvram.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/nvram.h | 4 ++++ 5 files changed, 47 insertions(+), 7 deletions(-) Index: linux/drivers/char/nvram.c =================================================================== --- linux.orig/drivers/char/nvram.c 2015-07-25 17:45:37.000000000 +1000 +++ linux/drivers/char/nvram.c 2015-07-25 17:45:42.000000000 +1000 @@ -48,6 +48,11 @@ #include +#ifdef CONFIG_PPC +#include +#include +#endif + static DEFINE_MUTEX(nvram_mutex); static DEFINE_SPINLOCK(nvram_state_lock); static int nvram_open_cnt; /* #times opened */ @@ -338,6 +343,37 @@ static long nvram_misc_ioctl(struct file long ret = -ENOTTY; switch (cmd) { +#ifdef CONFIG_PPC +#ifdef CONFIG_PPC_PMAC + case OBSOLETE_PMAC_NVRAM_GET_OFFSET: + pr_warn("nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); + /* fall through */ + case IOC_NVRAM_GET_OFFSET: { + int part, offset; + + if (!machine_is(powermac)) + return -EINVAL; + if (copy_from_user(&part, + (void __user *)arg, sizeof(part)) != 0) + return -EFAULT; + if (part < pmac_nvram_OF || part > pmac_nvram_NR) + return -EINVAL; + offset = pmac_get_partition(part); + if (copy_to_user((void __user *)arg, + &offset, sizeof(offset)) != 0) + return -EFAULT; + ret = 0; + break; + } +#endif + case IOC_NVRAM_SYNC: + if (arch_nvram_ops.sync != NULL) { + mutex_lock(&nvram_mutex); + ret = arch_nvram_ops.sync(); + mutex_unlock(&nvram_mutex); + } + break; +#else /* !CONFIG_PPC */ case NVRAM_INIT: /* initialize NVRAM contents and checksum */ if (!capable(CAP_SYS_ADMIN)) @@ -361,6 +397,7 @@ static long nvram_misc_ioctl(struct file mutex_unlock(&nvram_mutex); } break; +#endif /* CONFIG_PPC */ } return ret; } @@ -376,6 +413,7 @@ static int nvram_misc_open(struct inode return -EBUSY; } +#ifndef CONFIG_PPC /* Prevent multiple writers if the set_checksum ioctl is implemented. */ if ((arch_nvram_ops.set_checksum != NULL) && (file->f_mode & FMODE_WRITE) && @@ -383,6 +421,7 @@ static int nvram_misc_open(struct inode spin_unlock(&nvram_state_lock); return -EBUSY; } +#endif if (file->f_flags & O_EXCL) nvram_open_mode |= NVRAM_EXCL; Index: linux/include/linux/nvram.h =================================================================== --- linux.orig/include/linux/nvram.h 2015-07-25 17:45:33.000000000 +1000 +++ linux/include/linux/nvram.h 2015-07-25 17:45:42.000000000 +1000 @@ -17,8 +17,12 @@ struct nvram_ops { unsigned char (*read_byte)(int); void (*write_byte)(unsigned char, int); ssize_t (*get_size)(void); +#ifdef CONFIG_PPC + long (*sync)(void); +#else long (*set_checksum)(void); long (*initialize)(void); +#endif }; extern const struct nvram_ops arch_nvram_ops; Index: linux/arch/powerpc/include/asm/nvram.h =================================================================== --- linux.orig/arch/powerpc/include/asm/nvram.h 2015-07-25 17:45:41.000000000 +1000 +++ linux/arch/powerpc/include/asm/nvram.h 2015-07-25 17:45:42.000000000 +1000 @@ -78,9 +78,6 @@ extern int pmac_get_partition(int partit extern u8 pmac_xpram_read(int xpaddr); extern void pmac_xpram_write(int xpaddr, u8 data); -/* Synchronize NVRAM */ -extern void nvram_sync(void); - /* Initialize NVRAM OS partition */ extern int __init nvram_init_os_partition(struct nvram_os_partition *part); Index: linux/arch/powerpc/kernel/setup_32.c =================================================================== --- linux.orig/arch/powerpc/kernel/setup_32.c 2015-07-25 17:45:41.000000000 +1000 +++ linux/arch/powerpc/kernel/setup_32.c 2015-07-25 17:45:42.000000000 +1000 @@ -170,7 +170,6 @@ __setup("l3cr=", ppc_setup_l3cr); #ifdef CONFIG_GENERIC_NVRAM -/* Generic nvram hooks used by drivers/char/gen_nvram.c */ unsigned char nvram_read_byte(int addr) { if (ppc_md.nvram_read_val) @@ -193,15 +192,16 @@ static ssize_t ppc_nvram_get_size(void) return -ENODEV; } -void nvram_sync(void) +static long ppc_nvram_sync(void) { if (ppc_md.nvram_sync) ppc_md.nvram_sync(); + return 0; } -EXPORT_SYMBOL(nvram_sync); const struct nvram_ops arch_nvram_ops = { .get_size = ppc_nvram_get_size, + .sync = ppc_nvram_sync, }; EXPORT_SYMBOL(arch_nvram_ops); Index: linux/drivers/char/generic_nvram.c =================================================================== --- linux.orig/drivers/char/generic_nvram.c 2015-07-25 17:45:41.000000000 +1000 +++ linux/drivers/char/generic_nvram.c 2015-07-25 17:45:42.000000000 +1000 @@ -111,7 +111,7 @@ static int nvram_ioctl(struct file *file } #endif /* CONFIG_PPC_PMAC */ case IOC_NVRAM_SYNC: - nvram_sync(); + arch_nvram_ops.sync(); break; default: return -EINVAL; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/