3.16.82-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Bart Van Assche bvanassche@acm.org
commit f6b8540f40201bff91062dd64db8e29e4ddaaa9d upstream.
According to SBC-2 a TRANSFER LENGTH field of zero means that 256 logical blocks must be transferred. Make the SCSI tracing code follow SBC-2.
Fixes: bf8162354233 ("[SCSI] add scsi trace core functions and put trace points") Cc: Christoph Hellwig hch@lst.de Cc: Hannes Reinecke hare@suse.com Cc: Douglas Gilbert dgilbert@interlog.com Link: https://lore.kernel.org/r/20191105215553.185018-1-bvanassche@acm.org Signed-off-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/scsi/scsi_trace.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/scsi/scsi_trace.c +++ b/drivers/scsi/scsi_trace.c @@ -30,15 +30,18 @@ static const char * scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len) { const char *ret = p->buffer + p->len; - sector_t lba = 0, txlen = 0; + u32 lba = 0, txlen;
lba |= ((cdb[1] & 0x1F) << 16); lba |= (cdb[2] << 8); lba |= cdb[3]; - txlen = cdb[4]; + /* + * From SBC-2: a TRANSFER LENGTH field set to zero specifies that 256 + * logical blocks shall be read (READ(6)) or written (WRITE(6)). + */ + txlen = cdb[4] ? cdb[4] : 256;
- trace_seq_printf(p, "lba=%llu txlen=%llu", - (unsigned long long)lba, (unsigned long long)txlen); + trace_seq_printf(p, "lba=%u txlen=%u", lba, txlen); trace_seq_putc(p, 0);
return ret;