Commit 78db6e30 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Tejun Heo

scsi: add scsi_set_sense_field_pointer()

Add a function to set the field pointer for SCSI sense codes.
Signed-off-by: 's avatarHannes Reinecke <hare@suse.com>
Signed-off-by: 's avatarTejun Heo <tj@kernel.org>
parent 06dbde5f
......@@ -293,3 +293,56 @@ int scsi_set_sense_information(u8 *buf, int buf_len, u64 info)
return 0;
}
EXPORT_SYMBOL(scsi_set_sense_information);
/**
* scsi_set_sense_field_pointer - set the field pointer sense key
* specific information in a formatted sense data buffer
* @buf: Where to build sense data
* @buf_len: buffer length
* @fp: field pointer to be set
* @bp: bit pointer to be set
* @cd: command/data bit
*
* Return value:
* 0 on success or EINVAL for invalid sense buffer length
*/
int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd)
{
u8 *ucp, len;
if ((buf[0] & 0x7f) == 0x72) {
len = buf[7];
ucp = (char *)scsi_sense_desc_find(buf, len + 8, 2);
if (!ucp) {
buf[7] = len + 8;
ucp = buf + 8 + len;
}
if (buf_len < len + 8)
/* Not enough room for info */
return -EINVAL;
ucp[0] = 2;
ucp[1] = 6;
ucp[4] = 0x80; /* Valid bit */
if (cd)
ucp[4] |= 0x40;
if (bp < 0x8)
ucp[4] |= 0x8 | bp;
put_unaligned_be16(fp, &ucp[5]);
} else if ((buf[0] & 0x7f) == 0x70) {
len = buf[7];
if (len < 18)
buf[7] = 18;
buf[15] = 0x80;
if (cd)
buf[15] |= 0x40;
if (bp < 0x8)
buf[15] |= 0x8 | bp;
put_unaligned_be16(fp, &buf[16]);
}
return 0;
}
EXPORT_SYMBOL(scsi_set_sense_field_pointer);
......@@ -63,6 +63,7 @@ extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
int desc_type);
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment