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authorKees Cook <keescook@chromium.org>2021-08-18 20:30:18 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-08-18 23:28:28 +0300
commite4788edc730a0d2b26e1ae1f08fbb3f635b92dbb (patch)
treeca9b79e36cacc0016f4f902a70e19a3b89495541 /include/linux/usb
parent72dd1843232c9de48e21dc1c85d169fe5328e52e (diff)
downloadlinux-e4788edc730a0d2b26e1ae1f08fbb3f635b92dbb.tar.xz
USB: EHCI: Add alias for Broadcom INSNREG
Refactor struct ehci_regs to avoid accessing beyond the end of port_status. This change results in no difference in the final object code. Avoids several warnings when building with -Warray-bounds: drivers/usb/host/ehci-brcm.c: In function 'ehci_brcm_reset': drivers/usb/host/ehci-brcm.c:113:32: warning: array subscript 16 is above array bounds of 'u32[15]' {aka 'unsigned int[15]'} [-Warray-bounds] 113 | ehci_writel(ehci, 0x00800040, &ehci->regs->port_status[0x10]); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/usb/host/ehci.h:274, from drivers/usb/host/ehci-brcm.c:15: ./include/linux/usb/ehci_def.h:132:7: note: while referencing 'port_status' 132 | u32 port_status[HCS_N_PORTS_MAX]; | ^~~~~~~~~~~ Note that the documentation around this proprietary register was confusing. If "USB_EHCI_INSNREG00" is at port_status[0x0f], its offset would be 0x80 (not 0x90). The comments have been adjusted to fix this apparent typo. Fixes: 9df231511bd6 ("usb: ehci: Add new EHCI driver for Broadcom STB SoC's") Cc: Al Cooper <alcooperx@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-usb@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Suggested-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210818173018.2259231-3-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/ehci_def.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h
index dcbe2b068569..c892c5bc6638 100644
--- a/include/linux/usb/ehci_def.h
+++ b/include/linux/usb/ehci_def.h
@@ -176,16 +176,23 @@ struct ehci_regs {
#define USBMODE_CM_HC (3<<0) /* host controller mode */
#define USBMODE_CM_IDLE (0<<0) /* idle state */
};
- u32 reserved4;
/* Moorestown has some non-standard registers, partially due to the fact that
* its EHCI controller has both TT and LPM support. HOSTPCx are extensions to
* PORTSCx
*/
- /* HOSTPC: offset 0x84 */
- u32 hostpc[HCS_N_PORTS_MAX];
+ union {
+ struct {
+ u32 reserved4;
+ /* HOSTPC: offset 0x84 */
+ u32 hostpc[HCS_N_PORTS_MAX];
#define HOSTPC_PHCD (1<<22) /* Phy clock disable */
#define HOSTPC_PSPD (3<<25) /* Port speed detection */
+ };
+
+ /* Broadcom-proprietary USB_EHCI_INSNREG00 @ 0x80 */
+ u32 brcm_insnreg[4];
+ };
u32 reserved5[2];