efi: move utf16 string functions to efi.h

There are currently two implementations of the utf16 string functions.
Somewhat confusingly, they've got different names.

Centralise the functions in efi.h.

Reviewed-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Reviewed-by: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 7acafb8..34c8783 100644 (file)
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -172,23 +172,6 @@ static void efivar_update_sysfs_entries(struct work_struct *);
 static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
 static bool efivar_wq_enabled = true;
 
-/* Return the number of unicode characters in data */
-static unsigned long
-utf16_strnlen(efi_char16_t *s, size_t maxlength)
-{
-       unsigned long length = 0;
-
-       while (*s++ != 0 && length < maxlength)
-               length++;
-       return length;
-}
-
-static inline unsigned long
-utf16_strlen(efi_char16_t *s)
-{
-       return utf16_strnlen(s, ~0UL);
-}
-
 /*
  * Return the number of bytes is the length of this string
  * Note: this is NOT the same as the number of unicode characters

diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
index 91ddf0f..c409a75 100644 (file)
--- a/drivers/firmware/google/gsmi.c
+++ b/drivers/firmware/google/gsmi.c
@@ -288,17 +288,6 @@ static int gsmi_exec(u8 func, u8 sub)
        return rc;
 }
 
-/* Return the number of unicode characters in data */
-static size_t
-utf16_strlen(efi_char16_t *data, unsigned long maxlength)
-{
-       unsigned long length = 0;
-
-       while (*data++ != 0 && length < maxlength)
-               length++;
-       return length;
-}
-
 static efi_status_t gsmi_get_variable(efi_char16_t *name,
                                      efi_guid_t *vendor, u32 *attr,
                                      unsigned long *data_size,
@@ -311,7 +300,7 @@ static efi_status_t gsmi_get_variable(efi_char16_t *name,
        };
        efi_status_t ret = EFI_SUCCESS;
        unsigned long flags;
-       size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
+       size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
        int rc;
 
        if (name_len >= GSMI_BUF_SIZE / 2)
@@ -380,7 +369,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
                return EFI_BAD_BUFFER_SIZE;
 
        /* Let's make sure the thing is at least null-terminated */
-       if (utf16_strlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
+       if (utf16_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
                return EFI_INVALID_PARAMETER;
 
        spin_lock_irqsave(&gsmi_dev.lock, flags);
@@ -408,7 +397,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
 
                /* Copy the name back */
                memcpy(name, gsmi_dev.name_buf->start, GSMI_BUF_SIZE);
-               *name_size = utf16_strlen(name, GSMI_BUF_SIZE / 2) * 2;
+               *name_size = utf16_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
 
                /* copy guid to return buffer */
                memcpy(vendor, &param.guid, sizeof(param.guid));
@@ -434,7 +423,7 @@ static efi_status_t gsmi_set_variable(efi_char16_t *name,
                              EFI_VARIABLE_BOOTSERVICE_ACCESS |
                              EFI_VARIABLE_RUNTIME_ACCESS,
        };
-       size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
+       size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
        efi_status_t ret = EFI_SUCCESS;
        int rc;
        unsigned long flags;

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 9bf2f1f..d1d782a 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -719,6 +719,23 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
        *addr &= PAGE_MASK;
 }
 
+/* Return the number of unicode characters in data */
+static inline unsigned long
+utf16_strnlen(efi_char16_t *s, size_t maxlength)
+{
+       unsigned long length = 0;
+
+       while (*s++ != 0 && length < maxlength)
+               length++;
+       return length;
+}
+
+static inline unsigned long
+utf16_strlen(efi_char16_t *s)
+{
+       return utf16_strnlen(s, ~0UL);
+}
+
 #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
 /*
  * EFI Variable support.