Re: [PATCH 06/22] ide-tape: struct idetape_tape_t: remove unused members

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Hello.

Borislav Petkov wrote:

- last_frame_position: only being written to once
- firmware_revision, product_id, vendor_id: used once, remove from struct
  idetape_tape_t and deal with them locally
- firmware_revision_num: only written to once
- tape_still_time_begin: completely unused
- tape_still_time: never written to; remove corresponding code chunk
- uncontrolled_last_pipeline_head: only once written to
- blocks_in_buffer: only written to

Signed-off-by: Borislav Petkov <petkovbb@xxxxxxxxx>

   Late complaint but anyway... :-)

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index e0e8184..126e8a9 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -399,11 +397,6 @@ typedef struct ide_tape_obj {
 	int avg_size;
 	int avg_speed;
- char vendor_id[10];
-	char product_id[18];
-	char firmware_revision[6];
-	int firmware_revision_num;
-
 	/* the door is currently locked */
 	int door_locked;
 	/* the tape hardware is write protected */

[...]

@@ -3438,9 +3419,9 @@ static int idetape_identify_device (ide_drive_t *drive)
static void idetape_get_inquiry_results(ide_drive_t *drive)
 {
-	char *r;
 	idetape_tape_t *tape = drive->driver_data;
 	idetape_pc_t pc;
+	char fw_rev[6], vendor_id[10], product_id[18];
idetape_create_inquiry_cmd(&pc);
 	if (idetape_queue_pc_tail(drive, &pc)) {
@@ -3448,20 +3429,16 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
 				tape->name);
 		return;
 	}
-	memcpy(tape->vendor_id, &pc.buffer[8], 8);
-	memcpy(tape->product_id, &pc.buffer[16], 16);
-	memcpy(tape->firmware_revision, &pc.buffer[32], 4);
-
-	ide_fixstring(tape->vendor_id, 10, 0);
-	ide_fixstring(tape->product_id, 18, 0);
-	ide_fixstring(tape->firmware_revision, 6, 0);
-	r = tape->firmware_revision;
-	if (*(r + 1) == '.')
-		tape->firmware_revision_num = (*r - '0') * 100 +
-			(*(r + 2) - '0') * 10 +	*(r + 3) - '0';
+	memcpy(vendor_id, &pc.buffer[8], 8);
+	memcpy(product_id, &pc.buffer[16], 16);
+	memcpy(fw_rev, &pc.buffer[32], 4);
+
+	ide_fixstring(vendor_id, 10, 0);
+	ide_fixstring(product_id, 18, 0);
+	ide_fixstring(fw_rev, 6, 0);

It was wrong to call ide_fixstring() on unterminated strings and expecting them to become terminated strings after that; plus it was useless to add 2 characters padding at the end. When these variables were the fields of 'struct ide_tape_obj', those bytes were 0 because of the variable of this type being a static array. When they became local variables, they got garbage bytes at the end which ide_fixdriveid() either honestly copied when compressing spaces or just left where they were...

+
 	printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",

   Should've rather changed the string format to print only N characters max...

MBR, Sergei
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