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>

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 3075b04..1125ce2 100644 (file)
--- 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);
                }

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index dca41ae..d299713 100644 (file)
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -410,50 +410,6 @@ end_request:
                return 2;
 }
 
-/*
- * Check the contents of the interrupt reason register from the cdrom
- * and attempt to recover if there are problems.  Returns  0 if everything's
- * ok; nonzero if the request has been terminated.
- */
-static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
-                               int len, int ireason, int rw)
-{
-       ide_hwif_t *hwif = drive->hwif;
-
-       ide_debug_log(IDE_DBG_FUNC, "ireason: 0x%x, rw: 0x%x", ireason, rw);
-
-       /*
-        * ireason == 0: the drive wants to receive data from us
-        * ireason == 2: the drive is expecting to transfer data to us
-        */
-       if (ireason == (!rw << 1))
-               return 0;
-       else if (ireason == (rw << 1)) {
-
-               /* whoops... */
-               printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
-                               drive->name, __func__);
-
-               ide_pad_transfer(drive, rw, len);
-       } else  if (rw == 0 && ireason == 1) {
-               /*
-                * 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 {
-               /* 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 (rq->cmd_type == REQ_TYPE_ATA_PC)
-               rq->cmd_flags |= REQ_FAILED;
-
-       return -1;
-}
-
 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
 {
        struct request *rq = cmd->rq;
@@ -645,8 +601,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
                goto out_end;
        }
 
-       /* check which way to transfer data */
-       rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
+       rc = ide_check_ireason(drive, rq, len, ireason, write);
        if (rc)
                goto out_end;
 

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 59aedcd..70a2c94 100644 (file)
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1125,6 +1125,8 @@ void SELECT_MASK(ide_drive_t *, int);
 u8 ide_read_error(ide_drive_t *);
 void ide_read_bcount_and_ireason(ide_drive_t *, u16 *, u8 *);
 
+int ide_check_ireason(ide_drive_t *, struct request *, int, int, int);
+
 int ide_check_atapi_device(ide_drive_t *, const char *);
 
 void ide_init_pc(struct ide_atapi_pc *);