| Message ID | 20200107052202.510-1-sw0312.kim@samsung.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | usbtty: fix possible alignment issues | expand |
On Mon, 6 Jan 2020 at 22:17, Seung-Woo Kim <sw0312.kim at samsung.com> wrote: > > With gcc9, below warnings are shown: > drivers/serial/usbtty.c: In function 'usbtty_init_strings': > drivers/serial/usbtty.c:590:44: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 590 | str2wide (CONFIG_USBD_MANUFACTURER, string->wData); > | ~~~~~~^~~~~~~ > drivers/serial/usbtty.c:596:44: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 597 | str2wide (CONFIG_USBD_PRODUCT_NAME, string->wData); > | ~~~~~~^~~~~~~ > drivers/serial/usbtty.c:603:33: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 604 | str2wide (serial_number, string->wData); > | ~~~~~~^~~~~~~ > drivers/serial/usbtty.c:610:49: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 611 | str2wide (CONFIG_USBD_CONFIGURATION_STR, string->wData); > | ~~~~~~^~~~~~~ > drivers/serial/usbtty.c:617:50: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 618 | str2wide (CONFIG_USBD_DATA_INTERFACE_STR, string->wData); > | ~~~~~~^~~~~~~ > drivers/serial/usbtty.c:623:50: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] > 624 | str2wide (CONFIG_USBD_CTRL_INTERFACE_STR, string->wData); > | ~~~~~~^~~~~~~ > > Fix the issues by using packed structure. > > Ref: commit 616ebd8b9cb4 ("usb: composite: fix possible alignment issues") > Signed-off-by: Seung-Woo Kim <sw0312.kim at samsung.com> > --- > drivers/serial/usbtty.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) +Marek Vasut Reviewed-by: Simon Glass <sjg at chromium.org> I wonder if we should use the put_unaligned macros? Regards, Simon
diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c index f1c1a260da..54e67dd0d1 100644 --- a/drivers/serial/usbtty.c +++ b/drivers/serial/usbtty.c @@ -48,6 +48,8 @@ #define CONFIG_USBD_DATA_INTERFACE_STR "Bulk Data Interface" #define CONFIG_USBD_CTRL_INTERFACE_STR "Control Interface" +typedef struct { __le16 val; } __attribute__((aligned(16))) __le16_packed; + /* * Buffers to hold input and output data */ @@ -372,14 +374,15 @@ static int fill_buffer (circbuf_t * buf); void usbtty_poll (void); /* utility function for converting char* to wide string used by USB */ -static void str2wide (char *str, u16 * wide) +static void str2wide (char *str, void *wide) { int i; + __le16_packed *tmp = wide; for (i = 0; i < strlen (str) && str[i]; i++){ #if defined(__LITTLE_ENDIAN) - wide[i] = (u16) str[i]; + tmp[i].val = (u16) str[i]; #elif defined(__BIG_ENDIAN) - wide[i] = ((u16)(str[i])<<8); + tmp[i].val = ((u16)(str[i])<<8); #else #error "__LITTLE_ENDIAN or __BIG_ENDIAN undefined" #endif
With gcc9, below warnings are shown: drivers/serial/usbtty.c: In function 'usbtty_init_strings': drivers/serial/usbtty.c:590:44: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 590 | str2wide (CONFIG_USBD_MANUFACTURER, string->wData); | ~~~~~~^~~~~~~ drivers/serial/usbtty.c:596:44: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 597 | str2wide (CONFIG_USBD_PRODUCT_NAME, string->wData); | ~~~~~~^~~~~~~ drivers/serial/usbtty.c:603:33: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 604 | str2wide (serial_number, string->wData); | ~~~~~~^~~~~~~ drivers/serial/usbtty.c:610:49: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 611 | str2wide (CONFIG_USBD_CONFIGURATION_STR, string->wData); | ~~~~~~^~~~~~~ drivers/serial/usbtty.c:617:50: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 618 | str2wide (CONFIG_USBD_DATA_INTERFACE_STR, string->wData); | ~~~~~~^~~~~~~ drivers/serial/usbtty.c:623:50: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member] 624 | str2wide (CONFIG_USBD_CTRL_INTERFACE_STR, string->wData); | ~~~~~~^~~~~~~ Fix the issues by using packed structure. Ref: commit 616ebd8b9cb4 ("usb: composite: fix possible alignment issues") Signed-off-by: Seung-Woo Kim <sw0312.kim at samsung.com> --- drivers/serial/usbtty.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)