ide-cd: fix 'ireason' reporting in cdrom_pc_intr()
Mask 'ireason' variable so only the valid interrupt reason bits
will be reported on "drive appears confused" error.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 522580f..c7d77f0 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1446,7 +1446,7 @@
return ide_stopped;
/* Read the interrupt reason and the transfer length. */
- ireason = HWIF(drive)->INB(IDE_IREASON_REG);
+ ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
lowcyl = HWIF(drive)->INB(IDE_BCOUNTL_REG);
highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);
@@ -1487,7 +1487,7 @@
if (thislen > len) thislen = len;
/* The drive wants to be written to. */
- if ((ireason & 3) == 0) {
+ if (ireason == 0) {
if (!rq->data) {
blk_dump_rq_flags(rq, "cdrom_pc_intr, write");
goto confused;
@@ -1509,7 +1509,7 @@
}
/* Same drill for reading. */
- else if ((ireason & 3) == 2) {
+ else if (ireason == 2) {
if (!rq->data) {
blk_dump_rq_flags(rq, "cdrom_pc_intr, read");
goto confused;