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USB: g_file_storage: Set sense info Valid bit only when needed

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Strictly speaking, the Valid bit in SCSI sense data is supposed to
be set only when the Information field contains a valid number.  This
patch (as793) turns off the Valid bit when the Information field
hasn't been set.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2006-09-26 14:51:48 -04:00 committed by Greg Kroah-Hartman
parent e0318ebff4
commit 6174d0fd35
1 changed files with 15 additions and 1 deletions
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16
drivers/usb/gadget/file_storage.c
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@ -567,6 +567,7 @@ struct lun {
unsigned int ro : 1;
unsigned int prevent_medium_removal : 1;
unsigned int registered : 1;
unsigned int info_valid : 1;
u32 sense_data;
u32 sense_data_info;
@ -1656,6 +1657,7 @@ static int do_read(struct fsg_dev *fsg)
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
bh->inreq->length = 0;
bh->state = BUF_STATE_FULL;
break;
@ -1691,6 +1693,7 @@ static int do_read(struct fsg_dev *fsg)
if (nread < amount) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
@ -1785,6 +1788,7 @@ static int do_write(struct fsg_dev *fsg)
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
curlun->sense_data_info = usb_offset >> 9;
curlun->info_valid = 1;
continue;
}
amount -= (amount & 511);
@ -1827,6 +1831,7 @@ static int do_write(struct fsg_dev *fsg)
if (bh->outreq->status != 0) {
curlun->sense_data = SS_COMMUNICATION_FAILURE;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
@ -1868,6 +1873,7 @@ static int do_write(struct fsg_dev *fsg)
if (nwritten < amount) {
curlun->sense_data = SS_WRITE_ERROR;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
@ -2010,6 +2016,7 @@ static int do_verify(struct fsg_dev *fsg)
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
@ -2036,6 +2043,7 @@ static int do_verify(struct fsg_dev *fsg)
if (nread == 0) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
file_offset += nread;
@ -2079,6 +2087,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
struct lun *curlun = fsg->curlun;
u8 *buf = (u8 *) bh->buf;
u32 sd, sdinfo;
int valid;
/*
* From the SCSI-2 spec., section 7.9 (Unit attention condition):
@ -2106,15 +2115,18 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
fsg->bad_lun_okay = 1;
sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
sdinfo = 0;
valid = 0;
} else {
sd = curlun->sense_data;
sdinfo = curlun->sense_data_info;
valid = curlun->info_valid << 7;
curlun->sense_data = SS_NO_SENSE;
curlun->sense_data_info = 0;
curlun->info_valid = 0;
}
memset(buf, 0, 18);
buf[0] = 0x80 | 0x70; // Valid, current error
buf[0] = valid | 0x70; // Valid, current error
buf[2] = SK(sd);
put_be32(&buf[3], sdinfo); // Sense information
buf[7] = 18 - 8; // Additional sense length
@ -2703,6 +2715,7 @@ static int check_command(struct fsg_dev *fsg, int cmnd_size,
if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
curlun->sense_data = SS_NO_SENSE;
curlun->sense_data_info = 0;
curlun->info_valid = 0;
}
} else {
fsg->curlun = curlun = NULL;
@ -3332,6 +3345,7 @@ static void handle_exception(struct fsg_dev *fsg)
curlun->sense_data = curlun->unit_attention_data =
SS_NO_SENSE;
curlun->sense_data_info = 0;
curlun->info_valid = 0;
}
fsg->state = FSG_STATE_IDLE;
}