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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 <emilne@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Hannes Reinecke 2015-06-12 16:12:48 +02:00 committed by James Bottomley
parent 0c958ecc69
commit 0ae80ba91f
1 changed files with 6 additions and 1 deletions
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7
drivers/scsi/scsi_lib.c
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@ -2423,7 +2423,7 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
unsigned char cmd[12]; unsigned char cmd[12];
int use_10_for_ms; int use_10_for_ms;
int header_length; int header_length;
int result; int result, retry_count = retries;
struct scsi_sense_hdr my_sshdr; struct scsi_sense_hdr my_sshdr;
memset(data, 0, sizeof(*data)); 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->block_descriptor_length = buffer[3];
} }
data->header_length = header_length; 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; return result;