scsi: qla4xxx: shut up warning for rd_reg_indirect

The qla4_83xx_rd_reg_indirect() function can fail when it is unable to
read a register, but not all callers check its return value before using
the register data, and gcc correctly warns about this:

qla4xxx/ql4_83xx.c: In function 'qla4_83xx_process_reset_template':
qla4xxx/ql4_83xx.c:1073:36: warning: 'value' may be used uninitialized in this function
ha->reset_tmplt.array[index++] = value;
^
qla4xxx/ql4_83xx.c:1050:11: note: 'value' was declared here
uint32_t value;
^
qla4xxx/ql4_83xx.c:902:8: warning: 'value' may be used uninitialized in this function
value &= p_rmw_hdr->test_mask;
^
qla4xxx/ql4_83xx.c:895:11: note: 'value' was declared here
uint32_t value;
^
In file included from ../include/linux/io.h:25:0,
from ../include/linux/pci.h:31,
from ../drivers/scsi/qla4xxx/ql4_def.h:16,
from ../drivers/scsi/qla4xxx/ql4_83xx.c:10:
asm/io.h:101:2: warning: 'value' may be used uninitialized in this function
asm volatile("str %1, %0"
^
qla4xxx/ql4_83xx.c:874:11: note: 'value' was declared here
uint32_t value;
^

Unfortunately, I don't see any helpful way to add proper error handling
for this case, and the failure scenario for rd_reg seems rather obscure,
so this bails out and makes the rd_reg accessor set the result to
0xffffffff so we at least get a predictable value.

Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Nilesh Javali <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/qla4xxx/ql4_83xx.c

···
 
 	ret_val = qla4_83xx_set_win_base(ha, addr);
 
-	if (ret_val == QLA_SUCCESS)
+	if (ret_val == QLA_SUCCESS) {
 		*data = qla4_83xx_rd_reg(ha, QLA83XX_WILDCARD);
-	else
+	} else {
+		*data = 0xffffffff;
 		ql4_printk(KERN_ERR, ha, "%s: failed read of addr 0x%x!\n",
 			   __func__, addr);
+	}
 
 	return ret_val;
 }