lkml.org 
[lkml]   [2022]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: staging: r8188eu: struct rt_firmware_header issues
From
On 4/13/22 18:27, Michael Straube wrote:
> Hi all,
>
> I think the rt_firmware_hdr structure in rtw_fw.c has some issues.
>
>
> struct rt_firmware_hdr {
>     /*  8-byte alinment required */
>     /*  LONG WORD 0 ---- */
>     __le16        Signature;    /* 92C0: test chip; 92C,
>                      * 88C0: test chip; 88C1: MP A-cut;
>                      * 92C1: MP A-cut */
>     u8        Category;    /*  AP/NIC and USB/PCI */
>     u8        Function;    /*  Reserved for different FW function
>                      *  indcation, for further use when
>                      *  driver needs to download different
>                      *  FW for different conditions */
>     __le16        Version;    /*  FW Version */
>     u8        Subversion;    /*  FW Subversion, default 0x00 */
>     u16        Rsvd1;
>
>     /*  LONG WORD 1 ---- */
>     u8        Month;    /*  Release time Month field */
>     u8        Date;    /*  Release time Date field */
>     u8        Hour;    /*  Release time Hour field */
>     u8        Minute;    /*  Release time Minute field */
>     __le16        RamCodeSize;    /*  The size of RAM code */
>     u8        Foundry;
>     u8        Rsvd2;
>
>     /*  LONG WORD 2 ---- */
>     __le32        SvnIdx;    /*  The SVN entry index */
>     u32        Rsvd3;
>
>     /*  LONG WORD 3 ---- */
>     u32        Rsvd4;
>     u32        Rsvd5;
> };
>
>
> Then we have in rtl8188e_firmware_download():
>
>
>     fwhdr = (struct rt_firmware_hdr *)dvobj->firmware.data;
>
>     <snip>
>
>     if (IS_FW_HEADER_EXIST(fwhdr)) {
>         /*  Shift 32 bytes for FW header */
>         fw_data = fw_data + 32;
>         fw_size = fw_size - 32;
>     }
>
> We add/sub 32 bytes but the size of struct rt_firmware_hdr is actually
> 33 bytes. I noticed this when I wanted to replace:
>
>         fw_data = fw_data + 32;
>         fw_size = fw_size - 32;
>
> with:
>         fw_data = fw_data + sizeof(struct rt_firmware_hdr);
>         fw_size = fw_size - sizeof(struct rt_firmware_hdr);;
>
> To me it looks add/sub 32 is correct here but the struct is
> wrong. I don't know if the firmware for this driver is so much different
> from firmware for the drivers in drivers/net/wireless/realtek/rtlwifi.
> They use a struct of size 32.
>
> Also, souldn't the u16 and u32 variables in the struct be __le16 and
> __le32 ?
>
> I wonder if we can just use the rtlwifi_firmware_header structure from
> drivers/net/wireless/realtek/rtlwifi/wifi.h ?
>
> Comments from people with better knowledge appreciated. :)
>
> regards,
> Michael
>
>

Ok, I figured it out by looking at the hexdumps of firmware files. The
field Rsvd1 should be u8 instead of u16. I'll prepare a patch for this.

regards,
Michael

\
 
 \ /
  Last update: 2022-04-13 21:43    [W:2.758 / U:0.784 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site