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c5047d5b83
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200225011709.GA601@embeddedor
108 lines
1.9 KiB
C
108 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LBS_IF_USB_H
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#define _LBS_IF_USB_H
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#include <linux/wait.h>
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#include <linux/timer.h>
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struct lbs_private;
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/*
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* This file contains definition for USB interface.
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*/
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#define CMD_TYPE_REQUEST 0xF00DFACE
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#define CMD_TYPE_DATA 0xBEADC0DE
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#define CMD_TYPE_INDICATION 0xBEEFFACE
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#define IPFIELD_ALIGN_OFFSET 2
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#define BOOT_CMD_FW_BY_USB 0x01
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#define BOOT_CMD_FW_IN_EEPROM 0x02
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#define BOOT_CMD_UPDATE_BOOT2 0x03
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#define BOOT_CMD_UPDATE_FW 0x04
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#define BOOT_CMD_MAGIC_NUMBER 0x4C56524D /* LVRM */
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struct bootcmd
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{
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__le32 magic;
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uint8_t cmd;
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uint8_t pad[11];
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};
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#define BOOT_CMD_RESP_OK 0x0001
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#define BOOT_CMD_RESP_FAIL 0x0000
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#define BOOT_CMD_RESP_NOT_SUPPORTED 0x0002
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struct bootcmdresp
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{
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__le32 magic;
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uint8_t cmd;
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uint8_t result;
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uint8_t pad[2];
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};
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/* USB card description structure*/
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struct if_usb_card {
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struct usb_device *udev;
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uint32_t model; /* MODEL_* */
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struct urb *rx_urb, *tx_urb;
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struct lbs_private *priv;
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struct sk_buff *rx_skb;
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uint8_t ep_in;
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uint8_t ep_out;
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/* bootcmdresp == 0 means command is pending
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* bootcmdresp < 0 means error
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* bootcmdresp > 0 is a BOOT_CMD_RESP_* from firmware
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*/
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int8_t bootcmdresp;
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int ep_in_size;
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void *ep_out_buf;
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int ep_out_size;
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const struct firmware *fw;
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struct timer_list fw_timeout;
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wait_queue_head_t fw_wq;
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uint32_t fwseqnum;
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uint32_t totalbytes;
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uint32_t fwlastblksent;
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uint8_t CRC_OK;
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uint8_t fwdnldover;
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uint8_t fwfinalblk;
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uint8_t surprise_removed;
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__le16 boot2_version;
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};
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/* fwheader */
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struct fwheader {
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__le32 dnldcmd;
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__le32 baseaddr;
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__le32 datalength;
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__le32 CRC;
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};
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#define FW_MAX_DATA_BLK_SIZE 600
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/* FWData */
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struct fwdata {
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struct fwheader hdr;
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__le32 seqnum;
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uint8_t data[];
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};
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/* fwsyncheader */
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struct fwsyncheader {
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__le32 cmd;
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__le32 seqnum;
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};
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#define FW_HAS_DATA_TO_RECV 0x00000001
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#define FW_HAS_LAST_BLOCK 0x00000004
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#endif
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