ide-scsi: fix Interrupt Reason checking in idescsi_pc_intr()

Set PC_FLAG_WRITING pc flag in idescsi_queue() (if needed)
and then fix Interrupt Reason checking in idescsi_pc_intr().

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index ed92cf7..0880707 100644 (file)
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -427,7 +427,15 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
                printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
                return ide_do_reset (drive);
        }
-       if (ireason & IO) {
+       if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
+               /* Hopefully, we will never get here */
+               printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
+                               "to %s!\n", drive->name,
+                               (ireason & IO) ? "Write" : "Read",
+                               (ireason & IO) ? "Read" : "Write");
+               return ide_do_reset(drive);
+       }
+       if (!(pc->flags & PC_FLAG_WRITING)) {
                temp = pc->xferred + bcount;
                if (temp > pc->req_xfer) {
                        if (temp > pc->buf_size) {
@@ -436,7 +444,6 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
                                        "- discarding data\n");
                                temp = pc->buf_size - pc->xferred;
                                if (temp) {
-                                       pc->flags &= ~PC_FLAG_WRITING;
                                        if (pc->sg)
                                                idescsi_input_buffers(drive, pc,
                                                                        temp);
@@ -457,15 +464,11 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
                        printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 #endif /* IDESCSI_DEBUG_LOG */
                }
-       }
-       if (ireason & IO) {
-               pc->flags &= ~PC_FLAG_WRITING;
                if (pc->sg)
                        idescsi_input_buffers(drive, pc, bcount);
                else
                        hwif->input_data(drive, NULL, pc->cur_pos, bcount);
        } else {
-               pc->flags |= PC_FLAG_WRITING;
                if (pc->sg)
                        idescsi_output_buffers(drive, pc, bcount);
                else
@@ -777,6 +780,8 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
 
        memset (pc->c, 0, 12);
        pc->flags = 0;
+       if (cmd->sc_data_direction == DMA_TO_DEVICE)
+               pc->flags |= PC_FLAG_WRITING;
        pc->rq = rq;
        memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
        pc->buf = NULL;