From: Damien Le Moal damien.lemoal@wdc.com
commit 8f8fed0cdbbd6cdbf28d9ebe662f45765d2f7d39 upstream.
When a non-passthrough command is terminated with CHECK CONDITION, request sense is executed by hijacking the command descriptor. Since scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() do not save/restore the original command resid, the value returned on failure of the original command is lost and replaced with the value set by the execution of the request sense command. This value may in many instances be unaligned to the device sector size, causing sd_done() to print a warning message about the incorrect unaligned resid before the command is retried.
Fix this problem by saving the original command residual in struct scsi_eh_save using scsi_eh_prep_cmnd() and restoring it in scsi_eh_restore_cmnd(). In addition, to make sure that the request sense command is executed with a correctly initialized command structure, also reset the residual to 0 in scsi_eh_prep_cmnd() after saving the original command value in struct scsi_eh_save.
Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191001074839.1994-1-damien.lemoal@wdc.com Signed-off-by: Damien Le Moal damien.lemoal@wdc.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/scsi_error.c | 3 +++ include/scsi/scsi_eh.h | 1 + 2 files changed, 4 insertions(+)
--- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -935,6 +935,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd ses->sdb = scmd->sdb; ses->next_rq = scmd->request->next_rq; ses->result = scmd->result; + ses->resid_len = scmd->req.resid_len; ses->underflow = scmd->underflow; ses->prot_op = scmd->prot_op; ses->eh_eflags = scmd->eh_eflags; @@ -946,6 +947,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd memset(&scmd->sdb, 0, sizeof(scmd->sdb)); scmd->request->next_rq = NULL; scmd->result = 0; + scmd->req.resid_len = 0;
if (sense_bytes) { scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, @@ -999,6 +1001,7 @@ void scsi_eh_restore_cmnd(struct scsi_cm scmd->sdb = ses->sdb; scmd->request->next_rq = ses->next_rq; scmd->result = ses->result; + scmd->req.resid_len = ses->resid_len; scmd->underflow = ses->underflow; scmd->prot_op = ses->prot_op; scmd->eh_eflags = ses->eh_eflags; --- a/include/scsi/scsi_eh.h +++ b/include/scsi/scsi_eh.h @@ -32,6 +32,7 @@ extern int scsi_ioctl_reset(struct scsi_ struct scsi_eh_save { /* saved state */ int result; + unsigned int resid_len; int eh_eflags; enum dma_data_direction data_direction; unsigned underflow;