From: Hannes Reinecke Date: Fri, 12 Jun 2015 14:12:48 +0000 (+0200) Subject: scsi: retry MODE SENSE on unit attention X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0ae80ba91f57726f31b5b5890cb7c5173e624ca4;p=linux-beck.git scsi: retry MODE SENSE on unit attention The 'sd' driver is calling scsi_mode_sense() to figure out internal details. But scsi_mode_sense() never checks for any pending unit attentions, so we're getting annoying error messages like: MODE SENSE: unimplemented page/subpage: 0x00/0x00 and a possible wrong decision for device cache handling. Reviewed-by: Ewan Milne Signed-off-by: Hannes Reinecke Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 448ebdaa3d69..dffa91c67f5b 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2423,7 +2423,7 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, unsigned char cmd[12]; int use_10_for_ms; int header_length; - int result; + int result, retry_count = retries; struct scsi_sense_hdr my_sshdr; memset(data, 0, sizeof(*data)); @@ -2502,6 +2502,11 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, data->block_descriptor_length = buffer[3]; } data->header_length = header_length; + } else if ((status_byte(result) == CHECK_CONDITION) && + scsi_sense_valid(sshdr) && + sshdr->sense_key == UNIT_ATTENTION && retry_count) { + retry_count--; + goto retry; } return result;