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Commit e16da02f authored by Luben Tuikov's avatar Luben Tuikov Committed by Greg Kroah-Hartman
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USB: storage: Use normalized sense when emulating autosense 



This patch solves two things:
1) Enables autosense emulation code to correctly
interpret descriptor format sense data, and
2) Fixes a bug whereby the autosense emulation
code would overwrite descriptor format sense data
with SENSE KEY HARDWARE ERROR in fixed format, to
incorrectly look like this:

Oct 21 14:11:07 localhost kernel: sd 7:0:0:0: [sdc]  Sense Key : Recovered Error [current] [descriptor]
Oct 21 14:11:07 localhost kernel: Descriptor sense data with sense descriptors (in hex):
Oct 21 14:11:07 localhost kernel:        72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 00 00
Oct 21 14:11:07 localhost kernel:        00 4f 00 c2 00 50
Oct 21 14:11:07 localhost kernel: sd 7:0:0:0: [sdc]  ASC=0x4 ASCQ=0x1d

Signed-off-by: default avatarLuben Tuikov <ltuikov@yahoo.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Acked-by: default avatarMatthew Dharm <mdharm-usb@one-eyed-alien.net>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 73ddc247

drivers/usb/storage/transport.c

+19 −15
Original line number Diff line number Diff line
@@ -691,6 +691,9 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) 
		int temp_result;

		struct scsi_eh_save ses;

		int sense_size = US_SENSE_SIZE;

		struct scsi_sense_hdr sshdr;

		const u8 *scdd;

		u8 fm_ili;



		/* device supports and needs bigger sense buffer */

		if (us->fflags & US_FL_SANE_SENSE)
@@ -774,32 +777,30 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) 
			srb->sense_buffer[7] = (US_SENSE_SIZE - 8);

		}



		scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE,

				     &sshdr);



		US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);

		US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",

			  srb->sense_buffer[0],

			  srb->sense_buffer[2] & 0xf,

			  srb->sense_buffer[12], 

			  srb->sense_buffer[13]);

			  sshdr.response_code, sshdr.sense_key,

			  sshdr.asc, sshdr.ascq);

#ifdef CONFIG_USB_STORAGE_DEBUG

		usb_stor_show_sense(

			  srb->sense_buffer[2] & 0xf,

			  srb->sense_buffer[12], 

			  srb->sense_buffer[13]);

		usb_stor_show_sense(sshdr.sense_key, sshdr.asc, sshdr.ascq);

#endif



		/* set the result so the higher layers expect this data */

		srb->result = SAM_STAT_CHECK_CONDITION;



		scdd = scsi_sense_desc_find(srb->sense_buffer,

					    SCSI_SENSE_BUFFERSIZE, 4);

		fm_ili = (scdd ? scdd[3] : srb->sense_buffer[2]) & 0xA0;



		/* We often get empty sense data.  This could indicate that

		 * everything worked or that there was an unspecified

		 * problem.  We have to decide which.

		 */

		if (	/* Filemark 0, ignore EOM, ILI 0, no sense */

				(srb->sense_buffer[2] & 0xaf) == 0 &&

			/* No ASC or ASCQ */

				srb->sense_buffer[12] == 0 &&

				srb->sense_buffer[13] == 0) {



		if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 &&

		    fm_ili == 0) {

			/* If things are really okay, then let's show that.

			 * Zero out the sense buffer so the higher layers

			 * won't realize we did an unsolicited auto-sense.
@@ -814,6 +815,9 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) 
			 */

			} else {

				srb->result = DID_ERROR << 16;

				if ((sshdr.response_code & 0x72) == 0x72)

					srb->sense_buffer[1] = HARDWARE_ERROR;

				else

					srb->sense_buffer[2] = HARDWARE_ERROR;

			}

		}