ide: unify interrupt reason checking

Add ide_check_ireason() function that handles all ATAPI devices.
Reorganize all unlikely cases in ireason checking further down in the
code path.

In addition, add PFX for printks originating from ide-atapi. Finally,
remove ide_cd_check_ireason.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>

1 files changed, 68 insertions, 27 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 3075b0414667..1125ce29809b 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -10,6 +10,9 @@
 
 #include <scsi/scsi.h>
 
+#define DRV_NAME "ide-atapi"
+#define PFX DRV_NAME ": "
+
 #ifdef DEBUG
 #define debug_log(fmt, args...) \
         printk(KERN_INFO "ide: " fmt, ## args)
@@ -197,8 +200,8 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
                               GFP_NOIO);
         if (unlikely(err)) {
                 if (printk_ratelimit())
-                        printk(KERN_WARNING "%s: failed to map sense buffer\n",
-                               drive->name);
+                        printk(KERN_WARNING PFX "%s: failed to map sense "
+                                            "buffer\n", drive->name);
                 return;
         }
 
@@ -219,7 +222,7 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special)
 {
         /* deferred failure from ide_prep_sense() */
         if (!drive->sense_rq_armed) {
-                printk(KERN_WARNING "%s: failed queue sense request\n",
+                printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
                        drive->name);
                 return -ENOMEM;
         }
@@ -292,7 +295,7 @@ int ide_cd_expiry(ide_drive_t *drive)
                 break;
         default:
                 if (!(rq->cmd_flags & REQ_QUIET))
-                        printk(KERN_INFO "cmd 0x%x timed out\n",
+                        printk(KERN_INFO PFX "cmd 0x%x timed out\n",
                                          rq->cmd[0]);
                 wait = 0;
                 break;
@@ -326,6 +329,55 @@ void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 
 /*
+ * Check the contents of the interrupt reason register and attempt to recover if
+ * there are problems.
+ *
+ * Returns:
+ * - 0 if everything's ok
+ * - 1 if the request has to be terminated.
+ */
+int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
+                      int ireason, int rw)
+{
+        ide_hwif_t *hwif = drive->hwif;
+
+        debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
+
+        if (ireason == (!rw << 1))
+                return 0;
+        else if (ireason == (rw << 1)) {
+                printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
+                                drive->name, __func__);
+
+                if (dev_is_idecd(drive))
+                        ide_pad_transfer(drive, rw, len);
+        } else if (!rw && ireason == ATAPI_COD) {
+                if (dev_is_idecd(drive)) {
+                        /*
+                         * Some drives (ASUS) seem to tell us that status info
+                         * is available.  Just get it and ignore.
+                         */
+                        (void)hwif->tp_ops->read_status(hwif);
+                        return 0;
+                }
+        } else {
+                if (ireason & ATAPI_COD)
+                        printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
+                                        __func__);
+
+                /* drive wants a command packet, or invalid ireason... */
+                printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
+                                drive->name, __func__, ireason);
+        }
+
+        if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
+                rq->cmd_flags |= REQ_FAILED;
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(ide_check_ireason);
+
+/*
  * This is the usual interrupt handler which will be called during a packet
  * command.  We will transfer some of the data (as requested by the drive)
  * and will re-point interrupt handler to us.
@@ -359,7 +411,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 
                 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
                         if (drive->media == ide_floppy)
-                                printk(KERN_ERR "%s: DMA %s error\n",
+                                printk(KERN_ERR PFX "%s: DMA %s error\n",
                                         drive->name, rq_data_dir(pc->rq)
                                                      ? "write" : "read");
                         pc->flags |= PC_FLAG_DMA_ERROR;
@@ -391,8 +443,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
                                 pc->rq->errors++;
 
                         if (rq->cmd[0] == REQUEST_SENSE) {
-                                printk(KERN_ERR "%s: I/O error in request sense"
-                                                " command\n", drive->name);
+                                printk(KERN_ERR PFX "%s: I/O error in request "
+                                                "sense command\n", drive->name);
                                 return ide_do_reset(drive);
                         }
 
@@ -434,8 +486,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 
         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
-                printk(KERN_ERR "%s: The device wants to issue more interrupts "
-                                "in DMA mode\n", drive->name);
+                printk(KERN_ERR PFX "%s: The device wants to issue more "
+                                "interrupts in DMA mode\n", drive->name);
                 ide_dma_off(drive);
                 return ide_do_reset(drive);
         }
@@ -443,19 +495,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
         /* Get the number of bytes to transfer on this interrupt. */
         ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 
-        if (ireason & ATAPI_COD) {
-                printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
+        if (ide_check_ireason(drive, rq, bcount, ireason, write))
                 return ide_do_reset(drive);
-        }
-
-        if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
-                /* 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 & ATAPI_IO) ? "Write" : "Read",
-                                (ireason & ATAPI_IO) ? "Read" : "Write");
-                return ide_do_reset(drive);
-        }
 
         done = min_t(unsigned int, bcount, cmd->nleft);
         ide_pio_bytes(drive, cmd, write, done);
@@ -503,13 +544,13 @@ static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 
         while (retries-- && ((ireason & ATAPI_COD) == 0 ||
                 (ireason & ATAPI_IO))) {
-                printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
+                printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
                                 "a packet command, retrying\n", drive->name);
                 udelay(100);
                 ireason = ide_read_ireason(drive);
                 if (retries == 0) {
-                        printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
-                                        "a packet command, ignoring\n",
+                        printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
+                                        " a packet command, ignoring\n",
                                         drive->name);
                         ireason |= ATAPI_COD;
                         ireason &= ~ATAPI_IO;
@@ -540,7 +581,7 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
         u8 ireason;
 
         if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
-                printk(KERN_ERR "%s: Strange, packet command initiated yet "
+                printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
                                 "DRQ isn't asserted\n", drive->name);
                 return startstop;
         }
@@ -582,8 +623,8 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
                         ireason = ide_wait_ireason(drive, ireason);
 
                 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
-                        printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
-                                        "a packet command\n", drive->name);
+                        printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
+                                "issuing a packet command\n", drive->name);
 
                         return ide_do_reset(drive);
                 }